Yield and Growth Responses of Cowpea (Vigna Unguiculata (L.) Walp.) Genotypes to Fertilization
Title | Yield and Growth Responses of Cowpea (Vigna Unguiculata (L.) Walp.) Genotypes to Fertilization PDF eBook |
Author | Samuel Avendan̄o Laguna |
Publisher | |
Pages | 80 |
Release | 1981 |
Genre | Cowpea |
ISBN |
Response of Cowpea (Vigna Unguiculata L.) (walp) Genotypes to Varied Levels of Fertilizers and Spacing on Growth and Yield
Title | Response of Cowpea (Vigna Unguiculata L.) (walp) Genotypes to Varied Levels of Fertilizers and Spacing on Growth and Yield PDF eBook |
Author | NARASIMHAPPA K |
Publisher | |
Pages | 118 |
Release | 1999 |
Genre | |
ISBN |
Growth, Development and Yield of Cowpeas (Vigna Unguiculata (L.) Walp) in Response to Spacing, Nitrogen and Plant Growth Retardants
Title | Growth, Development and Yield of Cowpeas (Vigna Unguiculata (L.) Walp) in Response to Spacing, Nitrogen and Plant Growth Retardants PDF eBook |
Author | Amadou Tijan Jallow |
Publisher | |
Pages | 448 |
Release | 1985 |
Genre | Cowpea |
ISBN |
Reproductive Responses of Cowpea (Vigna Unguiculata [L.] Walp.) to Heat Stress
Title | Reproductive Responses of Cowpea (Vigna Unguiculata [L.] Walp.) to Heat Stress PDF eBook |
Author | Mohamed Osman Abdel Rahman Warrag |
Publisher | |
Pages | 232 |
Release | 1983 |
Genre | Cowpea |
ISBN |
Evaluation of Cowpea (Vigna Unguiculata L.) Genotypes for Growth, Yield and Protein Content for Vegetable Purpose
Title | Evaluation of Cowpea (Vigna Unguiculata L.) Genotypes for Growth, Yield and Protein Content for Vegetable Purpose PDF eBook |
Author | S.N. Darshan |
Publisher | |
Pages | 0 |
Release | 2022 |
Genre | |
ISBN |
Growth and Yield Responses of Cowpeas (Vigna Unguiculata L.) to Water Stress and Defoliation
Title | Growth and Yield Responses of Cowpeas (Vigna Unguiculata L.) to Water Stress and Defoliation PDF eBook |
Author | Zinhle Ntombela |
Publisher | |
Pages | 228 |
Release | 2012 |
Genre | Cowpea |
ISBN |
Developing Screening Tools for Abiotic Stresses Using Cowpea [Vigna Unguiculata (L.) Walp.] as a Model Crop
Title | Developing Screening Tools for Abiotic Stresses Using Cowpea [Vigna Unguiculata (L.) Walp.] as a Model Crop PDF eBook |
Author | Shardendu Kumar Singh |
Publisher | |
Pages | |
Release | 2008 |
Genre | Cowpea |
ISBN |
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.