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Efeito Da Alta Intensidade De Selecao No Melhoramento De Milho Zea Mays L
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Book Synopsis Efeito da alta intensidade de selecao no melhoramento de milho (Zea mays, L.). by : J.R. Moro
Download or read book Efeito da alta intensidade de selecao no melhoramento de milho (Zea mays, L.). written by J.R. Moro and published by . This book was released on 1982 with total page 59 pages. Available in PDF, EPUB and Kindle. Book excerpt: A populacao de milho CMS 05 foi introduzida na Brasil em 1976, pelo Centro Nacional de Pesquisa de Milho e Sorgo da EMBRAPA e demonstrou, quando avaliada em ensaios de competicao de variedades, ter um bom potencial de producao de graos em nosso Pais. Em 1977 foram obtidas 800 progenies de irmaos germanos dessa populacao, as quais foram avaliadas em 1977/78 em Sete Lagoas (MG). Foram entao selecionadas as treze progenies superiores, o que correspondeu a uma intensidade de selecao de 1,6%, bastante drastica em comparacao a comumente utilizada nos programas de melhoramento de milho do Brasil. As treze progenies selecionadas foram combinadas por duas geracoes, dando origem a populacao selecionada denominada de ciclo 1. Uma amostra da populacao original (ciclo 0) e outra do ciclo 1 foram enviadas a Piracicaba (SP). De cada amostra, apos o plantio, foram obtidas 100 progenies S1, sem selecao de plantas durante a autofecundacao. Cada progenie S1 entao cruzada com a populacao original e com uma outra populacao contrastante (CMS 12). Dessa forma, de cada ciclo, foram avaliadas tres tipos de progenies: S1 de per se, S1 cruzadas com a populacao original e S1 cruzadas com a populacao contrastante. Os ensaios foram realizados em Sete Lagoas (MG) e em Jardinopolis (SP). Os resultados obtidos mostraram que, com a alta intensidade de selecao e o reduzido tamanho efetivo (Ne = 26) da populacao selecionada, foram conseguidos progressos consideraveis com a selecao, possibilitando a obtencao de melhores progenies autofecundadas (...).
Book Synopsis Efeito da alta densidade de selecao no melhoramneto de milho (Zea mays L.). by : J.R. Moro
Download or read book Efeito da alta densidade de selecao no melhoramneto de milho (Zea mays L.). written by J.R. Moro and published by . This book was released on 1982 with total page 59 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Selecao para alta e baixa densidade das sementes de milho (Zea mays L.) opaco-2 e seu efeito sobre caracteres agronomicos e teores de proteina e lisina by : M. Barreiro Neto
Download or read book Selecao para alta e baixa densidade das sementes de milho (Zea mays L.) opaco-2 e seu efeito sobre caracteres agronomicos e teores de proteina e lisina written by M. Barreiro Neto and published by . This book was released on 1978 with total page 51 pages. Available in PDF, EPUB and Kindle. Book excerpt: Variedades opaco-2, obtidas do Banco de Germoplasma da Universidade Federal de Vicosa e amplamente representativas dos germoplasmas disponiveis para os trabalhos de melhoramento, foram submetidas a dois ciclos de selecao, para alta e baixa densidade da semente, objetivando-se determinar as correlacoes e os ganhos geneticos. Paralelamente foi feito teste de producao, analise dos coeficientes de correlacao genetica. Os ganhos geneticos, indiretos realizados, indicam que a selecao para maior densidade promoveu aumentos no peso de graos.
Book Synopsis Potencial da interpopulacao de milho (Zea mays L.) BR-105 x BR-106 para melhoramento genetico by : I.J. Pellicano
Download or read book Potencial da interpopulacao de milho (Zea mays L.) BR-105 x BR-106 para melhoramento genetico written by I.J. Pellicano and published by . This book was released on 1990 with total page 139 pages. Available in PDF, EPUB and Kindle. Book excerpt: O presente trabalho refere-se a avaliacao do potencial genetico das populacoes de milho (Zea mays L.) BR- 105 e BR-106 para melhoramento interpopulacional. Utilizaram-se para tanto, de progenies de meios irmaos interpopulaconais, obtidos de plantas endogamicas - S1,s. estas progenies, foram avaliadas em Goiania-GO, Sete Lagoas-MG e Londrina-PR. Foram tomados dados de producao (peso de espigas despalhadas), altura da planta e da espiga e indice de espigas (numero de espigas, divido por numero de plantas por parcela). A estimativa da heterose para peso de espigas despalhadas, foi de 23,55 e 11,19% em relacao aos caracteres altura da planta e da espiga, verificou-se que o hibrido interpopulacional possui porte semelhante a media dos hibridos comerciais, utilizados como testemunhas, e valores de hetroses baixos e ate negativos, principalmente em relacao a populacao parental superior (BR-106). Para todos os caracteres avaliados foram apresentados dados de variabilidade genetica interpopulacional e progressos esperados com selecao para investigar o potencial destas populacoes para o melhoramento interpopulacional. Verificou-se que as magnitudes destas estimativas, permitem progressos substanciais com selecao recorrente e reciproca. A variancia da interacao, efeitos aditivos x locais foi 2,40 vezes a inferior a variancia genetica, aditiva para o carater peso de espigas. Estes resultados,indicam que existe variabilidade genetica aditiva suficiente para permitir progressos substanciais com selecao para uma ampla regiao, (...).
Book Synopsis Potencial de interpopulacao de milho (Zea mays L.) BR-105 x BR-106 para o melhoramento genetico by : J.J. Pellicano
Download or read book Potencial de interpopulacao de milho (Zea mays L.) BR-105 x BR-106 para o melhoramento genetico written by J.J. Pellicano and published by . This book was released on 1990 with total page 139 pages. Available in PDF, EPUB and Kindle. Book excerpt: Avaliacao do potencial genetico das populacoes de milho (Zea mays L.) BR-105 e BR-106 para o melhoramento interpopulacional. Foram utilizadas progenies de meios irmaos interpopulacionais obtidas de plantas endogamicas - S1's. Estas progenies foram avaliadas em Goiania (GO), Sete Lagoas (MG) e Londrina (PR). Foram tomados dados de producao (peso de espigas despalhadas), altura de planta e espiga e indice de espigas (numero de espigas dividido pelo numero de plantas por parcela). De acordo com os resultados, as elevadas produtividades das populacoes per se e do hibrido interpopulacional, a heterose para peso de espigas relativamente alta, o porte das plantas e a altura das espigas semelhantes as testemunhas, a elevada magnitude da variabilidade genetica e do progresso com selecao, e a possibilidade de obtencao de hibridos de linhagens muito produtivas, evidenciam o potencial destas populacoes para serem utilizadas em programas de selecao recorrente reciproca e de hibridos de linhagens.
Book Synopsis Proceedings of the Second International Conference on Quantitative Genetics by : Bruce S. Weir
Download or read book Proceedings of the Second International Conference on Quantitative Genetics written by Bruce S. Weir and published by Sinauer Associates, Incorporated. This book was released on 1988 with total page 744 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Variabilidade genetica em milho (Zea mays L.) e relacoes com a selecao recorrente intra e interpopulacional by : C. L.de SOUZA JUNIOR
Download or read book Variabilidade genetica em milho (Zea mays L.) e relacoes com a selecao recorrente intra e interpopulacional written by C. L.de SOUZA JUNIOR and published by . This book was released on 1983 with total page 151 pages. Available in PDF, EPUB and Kindle. Book excerpt: O presente trabalho refere-se a: 1. avaliacao do potencial genetico das populacoes ESALQ-PB1 e BR-105 para a selecao recorrente intra e interpopulacional; 2. estudo de eficiencia relativa de alguns processo de selecao recorrente reciprocos e intrapopulacional no melhoramento do hibrido interpopulacional. Utilizou-se o Delineamento b, proposto por MIRANDA FILHO (1982) para a estimacao das variancias e covariancias geneticas e fenotipicas intra e interpopulacionais. Foram estimados os progressos geneticos por diversos esquemas de selecao recorrente, com referencia especial ao progresso esperado na heterose via selecao recorrente reciproca e no hibrido interpopulacional via selecao intrapopulacional simultanea em duas populacoes. As estimativas das variancias geneticas foram consideradas de valores intermediarios e indicaram que a populacao ESALQ-PB1 possui maior variabilidade genetica do que a populacao BR-105 para os caracteres peso de espigas e altura da espiga, ocorrendo o inverso para o carater altura da planta. As estimativas da relacao 0 = (o2A12 + o2A21)/(oA1A2 + oA2A1), tomada como modelo do potencial genetico para a expressao e melhoramento da heterose (MIRANDA FILHO, 1982), indicaram que apenas para o carater peso de espigas pode-se esperar alteracoes significativas na heterose via selecao. Os progressos esperados na heterose foram de 1,54 e 2,73 gramas por planta (equivalente a 1,25 e 2,21% em relacao ao hibrido interpopulacional), via selecao recorrente reciproca com familia de meio-irmaos obtidas (...).
Download or read book Agrindex written by and published by . This book was released on 1983 with total page 734 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Fertilizing for High Yield and Quality by : Lindbergue Araújo Crisóstomo
Download or read book Fertilizing for High Yield and Quality written by Lindbergue Araújo Crisóstomo and published by . This book was released on 2007 with total page 240 pages. Available in PDF, EPUB and Kindle. Book excerpt: Acerola; Banana; Cashew: dwarf variety; Citrus; Coconut: green dwarf variety; Guava; Mango; Papaya; Passion-fruit; Pineapple; Soursop.
Download or read book Brachiaria written by John W. Miles and published by CIAT. This book was released on 1996 with total page 306 pages. Available in PDF, EPUB and Kindle. Book excerpt: Identifying and naming Brachiaria species. Morphology, taxonomy, and natural distribution of Brachiaria (Trin.) Griseb. Natural variation in Brachiaria and existing germplasm collections. The agronomy and physiology of Brachiaria species. National requirementes of Brachiaria and adaptation to acid soils. Nutrient cycling and environmental impact of Brachiaria Pastures. Pests and diseases of Brachiaria species. Nutritional quality and animal production of Brachiaria pastures. Reproductive physiology, seed production, and seed quality of Brachiaria. Seed production: perspective from the Brazilian private sector. Genetic, cytogenetics, and reproductive biology of Brachiaria. Manipulation of apomixis in Brachiaria breeding. Theoretical potential of biotechniques in crop improvement. Aplication of biothecnology to Brachiaria. Regional experience with Brachiaria: Tropical America-humid lowlands. Regional experience with Brachiaria: Tropical America-savannas. Regional experience with Brachiaria: Sub-savannas Africa. Regional experience with Brachiaria: Asia, the South Pacific, and Australia. Reports of working groups.
Book Synopsis Micronutrients in Plant Physiology by : Ernest A. Kirkby
Download or read book Micronutrients in Plant Physiology written by Ernest A. Kirkby and published by . This book was released on 2004 with total page 52 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Integrated Management and Biocontrol of Vegetable and Grain Crops Nematodes by : A. Ciancio
Download or read book Integrated Management and Biocontrol of Vegetable and Grain Crops Nematodes written by A. Ciancio and published by Springer Science & Business Media. This book was released on 2007-12-08 with total page 364 pages. Available in PDF, EPUB and Kindle. Book excerpt: The second volume of the IMPD series describes aspects related to the most important phytoparasitic nematodes, considering the integration of biological control methods with other management practices and technologies, including the use of predatory nematodes and microbial rhizosphere antagonists. A focus is given on regional issues. A review on nematode management in cotton is integrated by a chapter on management of nematodes on wheat. New technologies are also revised.
Book Synopsis The Root Causes of Biodiversity Loss by : Alexander Wood
Download or read book The Root Causes of Biodiversity Loss written by Alexander Wood and published by Routledge. This book was released on 2013-11-05 with total page 416 pages. Available in PDF, EPUB and Kindle. Book excerpt: The world is losing species and biodiversity at an unprecedented rate. The causes go deep and the losses are driven by a complex array of social, economic, political and biological factors at different levels. Immediate causes such as over-harvesting, pollution and habitat change have been well studied, but the socioeconomic factors driving people to degrade their environment are less well understood. This book examines the underlying causes. It provides analyses of a range of case studies from Brazil, Cameroon, China, Danube River Basin, India, Mexico, Pakistan, Philippines, Tanzania and Vietnam, and integrates them into a new and interdisciplinary framework for understanding what is happening. From these results, the editors are able to derive policy conclusions and recommendations for operational and institutional approaches to address the root causes and reverse the current trends. It makes a contribution to the understanding of all those - from ecologists and conservationists to economists and policy makers - working on one of the major challenges we face.
Book Synopsis Australian Journal of Agricultural Research by :
Download or read book Australian Journal of Agricultural Research written by and published by . This book was released on 2000 with total page 442 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Grazing Management by : John Hodgson
Download or read book Grazing Management written by John Hodgson and published by . This book was released on 1990-08-15 with total page 224 pages. Available in PDF, EPUB and Kindle. Book excerpt: This text considers grazing management from the viewpoint of the ecology of grazing systems and focuses on the interrelationships between plant and animal populations which affect the stability of such systems, and the output of animal products from them. Relates the steps in the production process to the grassy surface characteristics that influence plant and animal behavior and uses these relationships to create a practical framework for management decisions.
Book Synopsis Principles of Plant Nutrition by : Konrad Mengel (etc)
Download or read book Principles of Plant Nutrition written by Konrad Mengel (etc) and published by Springer Science & Business Media. This book was released on 2001-07-31 with total page 868 pages. Available in PDF, EPUB and Kindle. Book excerpt: Plant nutrition; The soil as a plant nutrient medium; Nutrient uptake and assimilation; Plant water relationships; Plant growth and crop production; Fertilizer application; Nitrogen; Sulphur; Phosphorus; Potassium; Calcium; Magnesium; Iron; Manganese; Zinc; Copper; Molybdenum; Boron; Further elements of importance; Elements with more toxic effects.
Book Synopsis The Physiology of Vegetable Crops, 2nd Edition by : Hans Christian Wien
Download or read book The Physiology of Vegetable Crops, 2nd Edition written by Hans Christian Wien and published by CABI. This book was released on 2020-05-01 with total page 511 pages. Available in PDF, EPUB and Kindle. Book excerpt: Completely updated and revised, this bestselling book continues to explain the growth and developmental processes involved in the formation of vegetables. Since the publication of the successful first edition significant discoveries, particularly in the area of molecular biology, have deepened and broadened our knowledge and understanding of these processes. This new edition brings the topic up-to-date and is presented over two sections: the first provides general knowledge on germination, transplanting, flowering, the effects of stress and modelling, whilst the second section details the physiology of specific crops or crop groups.
