Alien Gene Transfer in Crop Plants, Volume 2

Download Alien Gene Transfer in Crop Plants, Volume 2 PDF Online Free

Author :
Publisher : Springer Science & Business Media
ISBN 13 : 1461495725
Total Pages : 432 pages
Book Rating : 4.4/5 (614 download)

DOWNLOAD NOW!


Book Synopsis Alien Gene Transfer in Crop Plants, Volume 2 by : Aditya Pratap

Download or read book Alien Gene Transfer in Crop Plants, Volume 2 written by Aditya Pratap and published by Springer Science & Business Media. This book was released on 2014-02-03 with total page 432 pages. Available in PDF, EPUB and Kindle. Book excerpt: Genetic engineering and biotechnology along with conventional breeding have played an important role in developing superior cultivars by transferring economically important traits from distant, wild and even unrelated species to the cultivated varieties which otherwise could not have been possible with conventional breeding. There is a vast amount of literature pertaining to the genetic improvement of crops over last few decades. However, the wonderful results achieved by crop scientists in food legumes’ research and development over the years are scattered in different journals of the World. The two volumes in the series ‘Alien Gene Transfer in Crop Plants’ address this issue and offer a comprehensive reference on the developments made in major food crops of the world. These volumes aim at bringing the contributions from globally renowned scientists at one platform in a reader-friendly manner. The second volume entitled, “Alien Gene Transfer in Crop Plants: Achievements and Impact” will deal more with the practical aspects. This volume will cover achievements of alien gene transfer in major food crops of the world and their impact on development of newer genetic variability and additional avenues for selection; development of superior cultivars for increased yield, resistance to biotic and abiotic stresses, improved nutritional and industrial quality; innovation of new techniques and positive as well as negative environmental implications. This volume has been divided into four groups with an aim to cover all major cereals, pulses, oilseeds and other crops (vegetable and horticultural crops) which are of economic importance.

Alien Gene Transfer in Crop Plants, Volume 2

Download Alien Gene Transfer in Crop Plants, Volume 2 PDF Online Free

Author :
Publisher : Springer
ISBN 13 : 9781493944224
Total Pages : 0 pages
Book Rating : 4.9/5 (442 download)

DOWNLOAD NOW!


Book Synopsis Alien Gene Transfer in Crop Plants, Volume 2 by : Aditya Pratap

Download or read book Alien Gene Transfer in Crop Plants, Volume 2 written by Aditya Pratap and published by Springer. This book was released on 2016-08-23 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Genetic engineering and biotechnology along with conventional breeding have played an important role in developing superior cultivars by transferring economically important traits from distant, wild and even unrelated species to the cultivated varieties which otherwise could not have been possible with conventional breeding. There is a vast amount of literature pertaining to the genetic improvement of crops over last few decades. However, the wonderful results achieved by crop scientists in food legumes’ research and development over the years are scattered in different journals of the World. The two volumes in the series ‘Alien Gene Transfer in Crop Plants’ address this issue and offer a comprehensive reference on the developments made in major food crops of the world. These volumes aim at bringing the contributions from globally renowned scientists at one platform in a reader-friendly manner. The second volume entitled, “Alien Gene Transfer in Crop Plants: Achievements and Impact” will deal more with the practical aspects. This volume will cover achievements of alien gene transfer in major food crops of the world and their impact on development of newer genetic variability and additional avenues for selection; development of superior cultivars for increased yield, resistance to biotic and abiotic stresses, improved nutritional and industrial quality; innovation of new techniques and positive as well as negative environmental implications. This volume has been divided into four groups with an aim to cover all major cereals, pulses, oilseeds and other crops (vegetable and horticultural crops) which are of economic importance.

Alien Gene Transfer in Crop Plants, Volume 1

Download Alien Gene Transfer in Crop Plants, Volume 1 PDF Online Free

Author :
Publisher : Springer Science & Business Media
ISBN 13 : 1461485851
Total Pages : 323 pages
Book Rating : 4.4/5 (614 download)

DOWNLOAD NOW!


Book Synopsis Alien Gene Transfer in Crop Plants, Volume 1 by : Aditya Pratap

Download or read book Alien Gene Transfer in Crop Plants, Volume 1 written by Aditya Pratap and published by Springer Science & Business Media. This book was released on 2013-11-01 with total page 323 pages. Available in PDF, EPUB and Kindle. Book excerpt: Genetic engineering and biotechnology along with conventional breeding have played an important role in developing superior cultivars by transferring economically important traits from distant, wild and even unrelated species to the cultivated varieties which otherwise could not have been possible with conventional breeding. There is a vast amount of literature pertaining to the genetic improvement of crops over last few decades. However, the wonderful results achieved by crop scientists in food legumes’ research and development over the years are scattered in different journals of the World. The two volumes in the series ‘Alien Gene Transfer in Crop Plants’ address this issue and offer a comprehensive reference on the developments made in major food crops of the world. These volumes aim at bringing the contributions from globally renowned scientists at one platform in a reader-friendly manner. The 1st volume entitled, ‘Alien Gene Transfer in Crop Plants: Innovations, Methods and Risk Assessment” will deal exclusively with the process and methodology. The contents of this volume have been designed to appraise the readers with all the theoretical and practical aspects of wide hybridization and gene transfer like processes and methods of gene transfer, role of biotechnology with special reference to embryo rescue, genetic transformation, protoplast fusion and molecular marker technology, problems such as cross incompatibility and barriers to distant hybridization and solutions to overcome them. Since wild and weedy relatives of crop plants may have negative traits associated with them, there are always possibilities of linkage drag while transferring alien alleles. Therefore, problems and limitations of alien gene transfer from these species will also be discussed in this series. Further, the associated risks with this and assessment of risks will also be given due weightage.

Phenomics in Crop Plants: Trends, Options and Limitations

Download Phenomics in Crop Plants: Trends, Options and Limitations PDF Online Free

Author :
Publisher : Springer
ISBN 13 : 8132222261
Total Pages : 422 pages
Book Rating : 4.1/5 (322 download)

DOWNLOAD NOW!


Book Synopsis Phenomics in Crop Plants: Trends, Options and Limitations by : Jitendra Kumar

Download or read book Phenomics in Crop Plants: Trends, Options and Limitations written by Jitendra Kumar and published by Springer. This book was released on 2015-03-05 with total page 422 pages. Available in PDF, EPUB and Kindle. Book excerpt: Identification of desirable genotypes with traits of interest is discernible for making genetic improvement of crop plants. In this direction, screening of a large number of germplasm for desirable traits and transfer of identified traits into agronomic backgrounds through recombination breeding is the common breeding approach. Although visual screening is easier for qualitative traits, its use is not much effective for quantitative traits and also for those, which are difficult to score visually. Therefore, it is imperative to phenotype the germplasm accessions and breeding materials precisely using high throughput phenomics tools for challenging and complex traits under natural, controlled and harsh environmental conditions. Realizing the importance of phenotyping data towards identification and utilization of a germplasm as donors, global scientific community has exerted increased focus on advancing phenomics in crop plants leading to development of a number of techniques and methodologies for screening of agronomic, physiological, and biochemical traits. These technologies have now become much advanced and entered the era of digital science. This book provides exhaustive information on various aspects related to phenotyping of crop plants and offers a most comprehensive reference on the developments made in traditional and high throughput phenotyping of agricultural crops.

Genomics Assisted Breeding of Crops for Abiotic Stress Tolerance, Vol. II

Download Genomics Assisted Breeding of Crops for Abiotic Stress Tolerance, Vol. II PDF Online Free

Author :
Publisher : Springer
ISBN 13 : 3319995731
Total Pages : 270 pages
Book Rating : 4.3/5 (199 download)

DOWNLOAD NOW!


Book Synopsis Genomics Assisted Breeding of Crops for Abiotic Stress Tolerance, Vol. II by : Vijay Rani Rajpal

Download or read book Genomics Assisted Breeding of Crops for Abiotic Stress Tolerance, Vol. II written by Vijay Rani Rajpal and published by Springer. This book was released on 2019-07-01 with total page 270 pages. Available in PDF, EPUB and Kindle. Book excerpt: The abiotic stresses like drought, temperature, cold, salinity, heavy metals etc. affect a great deal on the yield performance of the agricultural crops. To cope up with these challenges, plant breeding programs world-wide are focussing on the development of stress tolerant varieties in all crop species. Significant genomic advances have been made for abiotic stress tolerance in various crop species in terms of availability of molecular markers, QTL mapping, genome-wide association studies (GWAS), genomic selection (GS) strategies, and transcriptome profiling. The broad-range of articles involving genomics and breeding approaches deepens our existing knowledge about complex traits. The chapters are written by authorities in their respective fields. This book provides comprehensive and consolidated account on the applications of the most recent findings and the progress made in genomics assisted breeding for tolerance to abiotic stresses in many important major crop species with a focus on applications of modern strategies for sustainable agriculture. The book is especially intended for students, molecular breeders and scientists working on the genomics-assisted genetic improvement of crop species for abiotic stress tolerance.

Wild Germplasm for Genetic Improvement in Crop Plants

Download Wild Germplasm for Genetic Improvement in Crop Plants PDF Online Free

Author :
Publisher : Academic Press
ISBN 13 : 0128221704
Total Pages : 408 pages
Book Rating : 4.1/5 (282 download)

DOWNLOAD NOW!


Book Synopsis Wild Germplasm for Genetic Improvement in Crop Plants by : Muhammad Tehseen Azhar

Download or read book Wild Germplasm for Genetic Improvement in Crop Plants written by Muhammad Tehseen Azhar and published by Academic Press. This book was released on 2021-03-10 with total page 408 pages. Available in PDF, EPUB and Kindle. Book excerpt: Wild Germplasm for Genetic Improvement in Crop Plants addresses the need for an integrated reference on a wide variety of crop plants, facilitating comparison and contrast, as well as providing relevant relationships for future research and development. The book presents the genetic and natural history value of wild relatives, covers what wild relatives exist, explores the existing knowledge regarding specific relatives and the research surrounding them and identifies knowledge gaps. As understanding the role of crop wild relatives in plant breeding expands the genetic pool for abiotic and biotic stress resistance, this is an ideal reference on this important topic. - Provides a single-volume resource to important crops for accessible comparison and research - Explores both conventional and molecular approaches to breeding for targeted traits and allows for expanded genetic variability - Guides the development of hybrids for germplasm with increased tolerance to biotic and abiotic stresses

Safety of Genetically Engineered Foods

Download Safety of Genetically Engineered Foods PDF Online Free

Author :
Publisher : National Academies Press
ISBN 13 : 0309166152
Total Pages : 254 pages
Book Rating : 4.3/5 (91 download)

DOWNLOAD NOW!


Book Synopsis Safety of Genetically Engineered Foods by : National Research Council

Download or read book Safety of Genetically Engineered Foods written by National Research Council and published by National Academies Press. This book was released on 2004-07-08 with total page 254 pages. Available in PDF, EPUB and Kindle. Book excerpt: Assists policymakers in evaluating the appropriate scientific methods for detecting unintended changes in food and assessing the potential for adverse health effects from genetically modified products. In this book, the committee recommended that greater scrutiny should be given to foods containing new compounds or unusual amounts of naturally occurring substances, regardless of the method used to create them. The book offers a framework to guide federal agencies in selecting the route of safety assessment. It identifies and recommends several pre- and post-market approaches to guide the assessment of unintended compositional changes that could result from genetically modified foods and research avenues to fill the knowledge gaps.

Advances in Plant Breeding Strategies: Vegetable Crops

Download Advances in Plant Breeding Strategies: Vegetable Crops PDF Online Free

Author :
Publisher : Springer Nature
ISBN 13 : 3030669653
Total Pages : 559 pages
Book Rating : 4.0/5 (36 download)

DOWNLOAD NOW!


Book Synopsis Advances in Plant Breeding Strategies: Vegetable Crops by : Jameel M. Al-Khayri

Download or read book Advances in Plant Breeding Strategies: Vegetable Crops written by Jameel M. Al-Khayri and published by Springer Nature. This book was released on 2021-08-24 with total page 559 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book examines the development of innovative modern methodologies towards augmenting conventional plant breeding, in individual crops, for the production of new crop varieties under the increasingly limiting environmental and cultivation factors to achieve sustainable agricultural production, enhanced food security, in addition to providing raw materials for innovative industrial products and pharmaceuticals. This Volume 8, subtitled Vegetable Crops: Bulbs, Roots and Tubers, consists of 12 chapters focusing on advances in breeding strategies using both traditional and modern approaches for the improvement of individual vegetable crops. Chapters are arranged in 3 parts according to the edible vegetable parts. Part I: Bulbs - Garlic (Allium sativum L.), Leek (Allium ampeloprasum L.) and Shallot (Allium cepa L. Aggregatum group); Part II: Roots - Beetroot (Beta vulgaris ssp. vulgaris var. conditiva Alefeld), Carrot (Daucus carota L.), Parsnip (Pastinaca sativa L.), Radish (Raphanus sativus L.), Sugar beet (Beta vulgaris ssp. vulgaris L.) and Turnip (Brassica rapa var. rapa L.), Part III: Tubers - Potato (Solanum tuberosum L.) and Sweet potato (Ipomea batatas L.). The chapters were contributed by 38 internationally reputable scientists from 13 countries. Each chapter comprehensively reviews the modern literature on the subject and reflects the authors own experience.

Advances in Agronomy

Download Advances in Agronomy PDF Online Free

Author :
Publisher : Academic Press
ISBN 13 : 0323988423
Total Pages : 364 pages
Book Rating : 4.3/5 (239 download)

DOWNLOAD NOW!


Book Synopsis Advances in Agronomy by : Donald L. Sparks

Download or read book Advances in Agronomy written by Donald L. Sparks and published by Academic Press. This book was released on 2022-01-13 with total page 364 pages. Available in PDF, EPUB and Kindle. Book excerpt: Advances in Agronomy, Volume 171, the latest release in this leading reference, contains a variety of updates and new advances in the field, including updates on Elevated CO2 in Semi-arid Cropping Systems: A Synthesis of Research from the Australian Grains Free Air CO2 Enrichment (AGFACE) Research Program, Simultaneous Effects of Legume Cultivation on Carbon and Nitrogen Accumulation in Soil, Growing Small Grains Organically in the Semiarid West: A Review of Markets and Management Practices to Optimize Productivity and Sustainability, Principles and Applications of Topography in Precision Agriculture, Retention of Heavy Metals by Dredged Sediments and their Management Following Land Application, and more. Other chapters focus on Genetic Diversity for Developing Climate-resilient Wheats to Achieve Food Security Goals and A Century of Subclover: Lessons for Sustainable Intensification from a Historical Review of Innovations in Subterranean Clover Seed Production. - Includes numerous, timely, state-of-the-art reviews on the latest advancements in agronomy - Features distinguished, well recognized authors from around the world - Builds upon this venerable and iconic review series - Covers the extensive variety and breadth of subject matter in the crop and soil sciences

Genetically Modified Crops

Download Genetically Modified Crops PDF Online Free

Author :
Publisher : Springer Nature
ISBN 13 : 9811559325
Total Pages : 346 pages
Book Rating : 4.8/5 (115 download)

DOWNLOAD NOW!


Book Synopsis Genetically Modified Crops by : P. B. Kavi Kishor

Download or read book Genetically Modified Crops written by P. B. Kavi Kishor and published by Springer Nature. This book was released on 2020-10-08 with total page 346 pages. Available in PDF, EPUB and Kindle. Book excerpt: Genetic transformation is a key technology, in which genes are transferred from one organism to another in order to improve agronomic traits and ultimately help humans. However, there is concern in some quarters that genetically modified crops may disturb the ecosystem. A number of non-governmental organizations continue to protest against GM crops and foods, despite the fact that many organisms are genetically modified naturally in the course of evolution. In this context, there is a need to educate the public about the importance of GM crops in terms of food and nutritional security. This book provides an overview of various crop plants where genetic transformation has been successfully implemented to improve their agronomically useful traits. It includes information on the gene(s) transferred, the method of gene transfer and the beneficial effects of these gene transfers and the agronomic improvements compared to the wild plants. Further, it discusses the commercial prospects of these GM crops as well as the associated challenges. Given its scope, this book is a valuable resource for agricultural and horticultural scientists/experts wanting to explain to the public, politicians and non-governmental organizations the details of GM crops and how they can improve crops and the lives of farmers. It also appeals to researchers and postgraduate students. This volume focuses on the transgenics of mungbean, cowpea, chickpea, cotton, mulberrry, Jatropha, fingermillet, papaya, citrus plants and cassava. It also discusses CRISPR edited lines.

Advances in Seed Production and Management

Download Advances in Seed Production and Management PDF Online Free

Author :
Publisher : Springer Nature
ISBN 13 : 9811541981
Total Pages : 623 pages
Book Rating : 4.8/5 (115 download)

DOWNLOAD NOW!


Book Synopsis Advances in Seed Production and Management by : Ajay Kumar Tiwari

Download or read book Advances in Seed Production and Management written by Ajay Kumar Tiwari and published by Springer Nature. This book was released on 2021-02-26 with total page 623 pages. Available in PDF, EPUB and Kindle. Book excerpt: High-quality seed is essential for healthy crops and greater agricultural productivity. At the same time, advances in breeding technology require equivalent advances in seed technology. In order to ensure food security, it is crucial to develop seeds that are high yielding, and resistant to drought, heat, cold, and insects. Gathering the latest research in seed sciences, the book includes contributions on seed production in crops such as legumes, sugar, rice, wheat and other cereals. It discusses a range of topics, like the effect of climate change on seed quality, production and storage; seed rouging; seed certification for different crop species; seed biology; and seed pathologies and their effective management. Integrating basic and applied research, this compendium provides valuable insights for researchers and students in agricultural and life sciences; professionals involved in seed certification and those working in quarantine laboratories; as well as plant pathologists.

Introgression Breeding in Cultivated Plants

Download Introgression Breeding in Cultivated Plants PDF Online Free

Author :
Publisher : Frontiers Media SA
ISBN 13 : 2889716732
Total Pages : 192 pages
Book Rating : 4.8/5 (897 download)

DOWNLOAD NOW!


Book Synopsis Introgression Breeding in Cultivated Plants by : Jaime Prohens

Download or read book Introgression Breeding in Cultivated Plants written by Jaime Prohens and published by Frontiers Media SA. This book was released on 2021-11-24 with total page 192 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Breeding Oilseed Crops for Sustainable Production

Download Breeding Oilseed Crops for Sustainable Production PDF Online Free

Author :
Publisher : Academic Press
ISBN 13 : 0128014695
Total Pages : 584 pages
Book Rating : 4.1/5 (28 download)

DOWNLOAD NOW!


Book Synopsis Breeding Oilseed Crops for Sustainable Production by : Surinder Kumar Gupta

Download or read book Breeding Oilseed Crops for Sustainable Production written by Surinder Kumar Gupta and published by Academic Press. This book was released on 2015-09-25 with total page 584 pages. Available in PDF, EPUB and Kindle. Book excerpt: Breeding Oilseed Crops for Sustainable Production: Opportunities and Constraints presents key insights into accelerating the breeding of sustainable and superior varieties. The book explores the genetic engineering/biotechnology that has played a vital role in transforming economically important traits from distant/wild species to cultivated varieties, enhancing the quality and quantity of oil and seed yield production. Integrated nutrient management, efficient water management, and forecasting models for pests diseases outbreaks and integrated pest and pest management have also added new dimensions in breeding for sustainable production. With the rise in demand, the scientific community has responded positively by directing a greater amount of research towards sustainable production both for edible and industrial uses. Covering the latest information on various major world oil crops including rapeseed mustard, sunflower, groundnut, sesame, oilpalm, cotton, linseed/flax, castor and olive, this book brings the latest advances together in a single volume for researchers and advanced level students. - Describes various methods and systems to achieve sustainable production in all major oilseed crops - Addresses breeding, biology and utilization aspects simultaneously including those species whose information is not available elsewhere - Includes information on modern biotechnological and molecular techniques and production technologies - Relevant for international government, industrial and academic programs in research and development

Alien Introgression in Wheat

Download Alien Introgression in Wheat PDF Online Free

Author :
Publisher : Springer
ISBN 13 : 3319234943
Total Pages : 387 pages
Book Rating : 4.3/5 (192 download)

DOWNLOAD NOW!


Book Synopsis Alien Introgression in Wheat by : Márta Molnár-Láng

Download or read book Alien Introgression in Wheat written by Márta Molnár-Láng and published by Springer. This book was released on 2015-11-20 with total page 387 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book provides an overview of the latest advancements in the field of alien introgression in wheat. The discovery and wide application of molecular genetic techniques including molecular markers, in situ hybridization, and genomics has led to a surge in interspecific and intergeneric hybridization in recent decades. The work begins with the taxonomy of cereals, especially of those species which are potential gene sources for wheat improvement. The text then goes on to cover the origin of wheat, breeding in connection with alien introgressions, and the problems of producing intergeneric hybrids and backcross derivatives. These problems can include crossability, sterility, and unequal chromosome transmission. The work then covers alien introgressions according to the related species used, as well as new results in the field of genomics of wild wheat relatives and introgressions.

The Beans and the Peas

Download The Beans and the Peas PDF Online Free

Author :
Publisher : Woodhead Publishing
ISBN 13 : 0128214449
Total Pages : 316 pages
Book Rating : 4.1/5 (282 download)

DOWNLOAD NOW!


Book Synopsis The Beans and the Peas by : Aditya Pratap

Download or read book The Beans and the Peas written by Aditya Pratap and published by Woodhead Publishing. This book was released on 2020-11-22 with total page 316 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Beans and the Peas: From Orphan to Mainstream Crops presents a comprehensive literature resource on the most important food legume crops previously known as "orphans," but which are increasingly becoming mainstream as their production opportunities have been improved through genetic improvement and biotechnology, and their role as an important nutrient source gains urgency. This book focuses on 12 important food legumes and discusses all relevant aspects on their economic importance, crop statistics, botany, and their general description. It also provides exhaustive information on plant genetic resources and their use, genetic improvement, resistance to biotic and abiotic stresses, improved varieties, agronomy, seed system, and use of information and communication tools in each individual food legume.Development of innovative biotechnological tools, genetic transformation, and the genome sequencing information has also been covered in each chapter providing the readers with state-of-the-art information on pulses. All chapters have been supported by relevant figures, illustrations, and tables, which make the contents accessible and easy to understand.Each of the chapters has been authored by globally known scientists/researchers presenting up-to-date information on various aspects of food legumes. This book provides a current and comprehensive treatise to the readers and will be tremendously helpful in furthering their academic and research pursuits. - Provides a single-volume resource on the most important food legumes having a prominent role in food and nutritional security - Written by experts with a focus on providing foundational information for further research and development - Presents both theoretical aspects and application-based case studies - Supported by relevant figures, illustrations, and tables

Plant Relationships

Download Plant Relationships PDF Online Free

Author :
Publisher : Springer Nature
ISBN 13 : 3031165039
Total Pages : 471 pages
Book Rating : 4.0/5 (311 download)

DOWNLOAD NOW!


Book Synopsis Plant Relationships by : Barry Scott

Download or read book Plant Relationships written by Barry Scott and published by Springer Nature. This book was released on 2022-12-08 with total page 471 pages. Available in PDF, EPUB and Kindle. Book excerpt: This fully revised 3rd edition provides a comprehensive overview of the biology of fungi associated with plants. Since the publication of the 2nd Edition in 2009, tremendous new knowledge has been gained in the field of fungal-plant interactions, which is reflected in the contributions of this book. World-leading scientists in the field provide authoritative insights into fungal-plant interactions covering the following main topics: Mutualistic and pathogenic fungal-plant interactions in natural and agricultural ecosystems Sensing and signalling in fungus-plant interactions Regulation of fungal gene expression and development Fungal genomes and evolution Global pandemics caused by fungal pathogens and their implications for food security This volume will be of great interest to both specialists and generalists. It is an indispensable resource for researchers, lecturers and students in microbiology, mycology, and plant sciences, as well as agriculture and biotechnology.

Genomics-Enabled Crop Genetics

Download Genomics-Enabled Crop Genetics PDF Online Free

Author :
Publisher : Frontiers Media SA
ISBN 13 : 2889668932
Total Pages : 218 pages
Book Rating : 4.8/5 (896 download)

DOWNLOAD NOW!


Book Synopsis Genomics-Enabled Crop Genetics by : Yin Li

Download or read book Genomics-Enabled Crop Genetics written by Yin Li and published by Frontiers Media SA. This book was released on 2021-06-24 with total page 218 pages. Available in PDF, EPUB and Kindle. Book excerpt: