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Response Of Cowpea Vigna Sinensis L To Moisture Stress And Seed Pretreatments
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Book Synopsis Response of Cowpea (Vigna Sinensis L.) to Moisture Stress and Seed Pretreatments by : M. T. Diputado Junior
Download or read book Response of Cowpea (Vigna Sinensis L.) to Moisture Stress and Seed Pretreatments written by M. T. Diputado Junior and published by . This book was released on 1984 with total page 228 pages. Available in PDF, EPUB and Kindle. Book excerpt: To compare the germinability and seedling establishment of different cowpea cultivars subjected to different degrees of water stress under greenhouse conditions; To compare the susceptibility or resistance to drought of the three cowpea varieties grown in pots and in culture solution and to describe possible bases of resistance; To determine the effect of seed pretreatments on plant responses to drought.
Book Synopsis The Response of Cowpea (Vigna Unguiculata L. Walp.) Seeds Differing in Seed Coat Colour to Storage and Reduced Water Availability During Germinataion by : Ernest Assah Asiedu
Download or read book The Response of Cowpea (Vigna Unguiculata L. Walp.) Seeds Differing in Seed Coat Colour to Storage and Reduced Water Availability During Germinataion written by Ernest Assah Asiedu and published by . This book was released on with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Genotypic variability and mid season drought responses of cowpea under controlled environment by :
Download or read book Genotypic variability and mid season drought responses of cowpea under controlled environment written by and published by Cuvillier Verlag. This book was released on 2001-09-11 with total page 140 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis The Response of Cowpea (Vigna Unguiculata L. Walp) Seeds Differing in Seed Coat Colour to Storage and Reduced Water Availability During Germination by : Ernest Assah Asiedu
Download or read book The Response of Cowpea (Vigna Unguiculata L. Walp) Seeds Differing in Seed Coat Colour to Storage and Reduced Water Availability During Germination written by Ernest Assah Asiedu and published by . This book was released on 1995 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Growth and Yield Responses of Cowpeas (Vigna Unguiculata L.) to Water Stress and Defoliation by : Zinhle Ntombela
Download or read book Growth and Yield Responses of Cowpeas (Vigna Unguiculata L.) to Water Stress and Defoliation written by Zinhle Ntombela and published by . This book was released on 2012 with total page 228 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Stomatal and Leaf Water Status Responses of Cowpea (Vigna Unguiculata (L.) Walp.) to Environmental Drought by : Loretta May Bates
Download or read book Stomatal and Leaf Water Status Responses of Cowpea (Vigna Unguiculata (L.) Walp.) to Environmental Drought written by Loretta May Bates and published by . This book was released on 1982 with total page 162 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Seed Yield, Water Use, and Water Use Efficiency of Cowpea in Response to Drought Stress at Different Developmental Stages by : Ekow Akyeampong
Download or read book Seed Yield, Water Use, and Water Use Efficiency of Cowpea in Response to Drought Stress at Different Developmental Stages written by Ekow Akyeampong and published by . This book was released on 1985 with total page 404 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Gas exchange, evapotranspiration efficiency, morphophysiology and productivity of cowpeas under water deficit by : Samson Huni
Download or read book Gas exchange, evapotranspiration efficiency, morphophysiology and productivity of cowpeas under water deficit written by Samson Huni and published by Cuvillier Verlag. This book was released on 2010-12-23 with total page 136 pages. Available in PDF, EPUB and Kindle. Book excerpt: The cowpea [Vigna unguiculata (L.) Walp.], a legume which originated in Africa, is now grown in the Tropics and many subtropical regions. Cowpea is of significance for food and feed and its yield is frequently severely affected by drought, resulting in its low average yield. Hence the influence of water deficit on gas exchange, growth, development and yield of cowpea was studied here, with the aim of contributing to our understanding of the response of cowpeas to water deficit and to the provision of efficient and viable information for breeding of drought resistant genotypes. To achieve this aim, several traits were examined, which included - gas exchange [stomatal conductance (gs), net photosynthetic rate PN), transpiration rate (E) and intrinsic transpiration efficiency TEi)], evapotranspiration efficiency (ETE), water use (WU) and yield/yield components, - relationship among these traits and variability among the various genotypes. From the results it was expected that it would be possible to find efficient plant types and characteristics to predict ETE and yield which could eventually be used in cowpea drought resistance breeding programmes. For this purpose three pot experiments were conducted in the greenhouse under drip irrigation. The control (well-watered treatment) was irrigated continuously from the beginning to the end of the experiments, while the water-deficit treatment experienced a reduced irrigation resulting in a soil water potential of -350 to -450hPa at the onset of flowering for 14 to 21 days. Measurement and analyses of various traits were carried out before the induction of water-deficit stress, during and at the end of stress. All remaining plants were then fully irrigated up to the end of the experiments. In experiments 1 and 2 the plants were harvested at maturity to determine yield and yield components, and biomass and ETE. Water-deficit stress impacted on all analysed traits and there were variations among genotypes in both treatments. Water deficit elicited the reduction of leaf relative water content and stomatal conductance. Consequently, PN and E declined as well. However, E decreased more than PN due to the influence of stress, generally leading to a higher TEi of the water-deficit treatment. There were differences among experiments, probably due to interactions between the genotypes and the environment. After stress, gas exchange recovered to similar levels of the control treatment. Biomass production, water use and evapotranspiration efficiency varied among genotypes within and between treatments. Compared with the control, water use and growth rate decreased clearly under stress. The role of PN for biomass production became evident in the positive correlation between both parameters. TEi had no distinct relationship to ETE. Three traits, specifically leaf temperature (ΔT), leaf senescence (expressed as leaf shedding score, LSS) and cell membrane stability (CMS, calculated from electrolyte leakage values) distinguish themselves as valuable tools for drought resistance analysis. ΔT rose up to 3°C higher under stress than well-watered conditions. LSS increased under stress as well, whereby the genotypes which shed a relative high number of leaves under well-watered conditions also shed an even higher amount of leaves under stress. The sole genotype which retained all its leaves under stress, UCR 328, maintained all its leaves green, which was probably tremendously valuable for a quick recovery of different plant processes after stress. ΔT was consistently positively correlated with LSS, but negatively with CMS, particularly under stress. ΔT and LSS also displayed significant relationships with ETE, TEi, grain yield and harvest index (HI). Owing to the fact that ΔT and LSS are simple, fast, cheap and non-invasively determined, they could be used in drought resistance breeding programmes as indirect selection traits for efficient plant types regarding transpiration, TEi, ETE and yield. The various genotypes yielded differently and the HI also varied under both treatments, a probable indication of differing genotypic yield potential. Water deficit at flowering reduced yield, but some genotypes had a higher HI. Generally, the genotypes with a high “yield potential” also manifested a higher yield under stress. TVu 12348 had the highest yield stability, but a low yield potential. UCR 328 and IFH 27-8 had a relatively high yield stability coupled with a high yield under stress.
Book Synopsis Quantitative Genetics of Seedling Drought Tolerance and Resistance to Drought-enhanced Macrophomina Phaseolina Infection in Cowpea (Vigna Unguiculata L. Walp) by : Wellington Muchero
Download or read book Quantitative Genetics of Seedling Drought Tolerance and Resistance to Drought-enhanced Macrophomina Phaseolina Infection in Cowpea (Vigna Unguiculata L. Walp) written by Wellington Muchero and published by . This book was released on 2007 with total page 398 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Yield Stability in Cowpea as Influenced by Five Drought Resistance Mechanisms by : Steven Mark Barineau
Download or read book Yield Stability in Cowpea as Influenced by Five Drought Resistance Mechanisms written by Steven Mark Barineau and published by . This book was released on 1987 with total page 274 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Physiological Responses of Cowpea (Vigna Unguiculata) to Water Stress Under Varying Water Regimes by : Kalanda Ilunga
Download or read book Physiological Responses of Cowpea (Vigna Unguiculata) to Water Stress Under Varying Water Regimes written by Kalanda Ilunga and published by . This book was released on 2014 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Physiological Responses of Cowpea (Vigna Sinensis (L.) Savi) Seeds to Differential Deterioration Levels by : Carlos Alberto Vechi
Download or read book Physiological Responses of Cowpea (Vigna Sinensis (L.) Savi) Seeds to Differential Deterioration Levels written by Carlos Alberto Vechi and published by . This book was released on 1970 with total page 71 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Morphological and Physiological Responses of Cowpea (Vigna Unguiculata (L) Walp.) Cultivars to Induced Water Stress and Phosphorus Nutrition by : Rogério Marcos Chiulele
Download or read book Morphological and Physiological Responses of Cowpea (Vigna Unguiculata (L) Walp.) Cultivars to Induced Water Stress and Phosphorus Nutrition written by Rogério Marcos Chiulele and published by . This book was released on 2003 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Reproductive Responses of Cowpea (Vigna Unguiculata [L.] Walp.) to Heat Stress by : Mohamed Osman Abdel Rahman Warrag
Download or read book Reproductive Responses of Cowpea (Vigna Unguiculata [L.] Walp.) to Heat Stress written by Mohamed Osman Abdel Rahman Warrag and published by . This book was released on 1983 with total page 232 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Challenges and opportunities for enhancing sustainable cowpea production: proceedings of the World Cowpea Conference III held at IITA, 4-8 September 2000 by :
Download or read book Challenges and opportunities for enhancing sustainable cowpea production: proceedings of the World Cowpea Conference III held at IITA, 4-8 September 2000 written by and published by IITA. This book was released on with total page 396 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Developing Screening Tools for Abiotic Stresses Using Cowpea [Vigna Unguiculata (L.) Walp.] as a Model Crop by : Shardendu Kumar Singh
Download or read book Developing Screening Tools for Abiotic Stresses Using Cowpea [Vigna Unguiculata (L.) Walp.] as a Model Crop written by Shardendu Kumar Singh and published by . This book was released on 2008 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Abiotic stresses cause extensive loss to agriculture production worldwide. Cowpea is an important legume crop grown widely in tropical and subtropical regions where high temperature, ultraviolet-B (UVB) radiation and drought are the common stress factors limiting production. Various vegetative, physiological, biochemical and reproductive plant attributes were assessed under a range of UVB radiation levels in Experiment I and in a combination with two doses of each carbon dioxide concentration [CO2], temperature, and UVB radiation and their interactions in Experiment II by using six cowpea genotypes and sunlit plant growth chambers. The dynamics of photosynthesis and fluorescence processes were assessed in 15 cowpea genotypes under drought condition in Experiment III in pot-grown plants under sunlit conditions. A distinct response pattern was not observed in cowpea in response to UVB radiation from 0 to 15 kJ; however, plants grown under elevated UVB showed reduced photosynthesis resulting in shorter plants and produced smaller flowers and lower seed yield. Increased phenolic compounds appeared to be a defense response to UVB radiation. The growth enhancements observed by doubling of [CO2] were not observed when plants were grown in combination with elevated UVB or temperature which also showed the most detrimental effects on plant growth and seed yield. Results from Experiment I and II revealed that cowpea reproductive traits were highly sensitive to abiotic stresses compared to the vegetative growth and development. A total stress response index (TSRI) technique, derived from all vegetative and reproductive parameters, was used to screen genotypes for their stress tolerance to UVB or combination of stresses. An increase in water use efficiency while maintaining higher rate of photosynthesis was an important drought tolerance mechanism in tolerant cowpea genotypes. Using principal component analysis technique, four groups of the genotypes were identified for their drought tolerance. Evaluating same genotypes across stress conditions revealed that no single genotype has the absolute tolerance characters to all stress conditions. The identified diversity for abiotic stress tolerance among cowpea genotypes and associated traits can be used to develop tolerant genotypes suitable for an agro-ecological niche though traditional breeding or genetic engineering methods.
Book Synopsis Evaluation of Physiological Parameters and Nitrogen Partitioning and Remobilization in Beans (Phaseolus Vulgaris L.) and Cowpeas (Vigna Unguiculata (walp) L.) Under Stress and Non-stress Soil Moisture Conditions by : Mmasera Manthe
Download or read book Evaluation of Physiological Parameters and Nitrogen Partitioning and Remobilization in Beans (Phaseolus Vulgaris L.) and Cowpeas (Vigna Unguiculata (walp) L.) Under Stress and Non-stress Soil Moisture Conditions written by Mmasera Manthe and published by . This book was released on 1994 with total page 460 pages. Available in PDF, EPUB and Kindle. Book excerpt: