Phenotypic variability studies in selected accessions of Nigerian wild cowpea (Vigna unguiculata L. Walp)

Benjamin, Usman; Olamide, Falusi; Yusuf, Daudu Oladipupo Abdulazeez; Abubakar, A.; Dickson, Nwosu; David, Titus Segun; Muhammad, Muhammad Liman

doi:10.30574/gscbps.2018.3.1.0015

Cited by 2 publications

(1 citation statement)

References 6 publications

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“…Thus, characters such as seed length or 100-seed weight are very useful indices in early selection when improving yield. Benjamin et al (2018), evaluated the genetic variability among 20 wild cowpea accessions and observed high variability among the accessions in terms of their agromorphological and yield parameters that can be exploited for its improvement. The high variability observed among the wild cowpea accessions in terms of their agromorphological and yield parameters provided useful traits in the crop that can be exploited for its improvement.…”

Section: Introductionmentioning

confidence: 99%

Association Mapping for Drought Tolerance and Yield-Related Traits in Cowpea Accessions Using Genome-Wide Association Study and Population Structure Analysis

Nkomo,

Sedibe,

Mofokeng

et al. 2022

Philipp Agric Scientist

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Cowpea is an important drought-tolerant crop that is grown mainly in Africa. The objective of this study was to conduct association mapping of drought tolerance phenotype with seedling and yield-related traits in cowpeas. A total of 60 cowpea accessions were used in the study. Single-nucleotide polymorphisms (SNPs) were discovered through genotyping-by-sequencing (GBS). In the primary pipeline analysis, fragments of poor-quality sequences with reproducibility below 90% and read depths lower than 3.5 for SNPs or 5 for presence–absence markers were filtered out. Approximately 2.5 million sequences per barcode/sample were identified and used in marker calling. Association mapping was conducted using single-marker regression (SMR) in Q Gene, and the general linear model (GLM) and mixed linear model (MLM) built in TASSEL v5.0. The population of the cowpea accessions was analyzed using STRUCTURE 2.3.4. Inferred number of populations (ΔK) of cowpea accessions grown in the greenhouse and glasshouse were six (6) and seven (7), respectively. Approximately 2.5 million sequences per barcode/sample were identified and used in marker calling. The total number of SNPs in the raw file was 438,198. After a quality control procedure, a variant call format (vcf). One SNP marker, was associated with number of pods (NP) with a p value < 0.001 while fifty SNP markers, were associated with pod weight (PWT) at p < 0.001. The same number of four SNP markers, were associated with average seeds per pod (AVSPD) at p < 0.001 and also with pod length (PL). Five SNP markers, were associated with pod width (PWDTH) at p < 0.001. Major differences among the significantly associated SNPs were observed in the two environments which were under different temperature conditions. The 65 SNP markers identified can be used in cowpea molecular breeding to select for drought tolerant phenotypes in cowpea through marker assisted selection (MAS).

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Section: Introductionmentioning

confidence: 99%

Association Mapping for Drought Tolerance and Yield-Related Traits in Cowpea Accessions Using Genome-Wide Association Study and Population Structure Analysis

Nkomo,

Sedibe,

Mofokeng

et al. 2022

Philipp Agric Scientist

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Agro-Morphological Variability of Wild Vigna Species Collected in Senegal

Dramé,

Bodian,

Fonceka

et al. 2023

Agronomy

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The domesticated Vigna species still need some of the beneficial characters that exist in the wild Vigna species, despite the improvements obtained so far. This study was carried out to enhance our understanding of the Senegalese wild Vigna diversity by exploring the agro-morphological characteristics of some accessions using 22 traits. The phenotyping was carried out in a shaded house for two consecutive rainy seasons (2021 and 2022) using the alpha-lattice experimental design with 55 accessions. Multiple correspondence analysis was carried out based on the qualitative traits, which showed considerable variability for the wild species (Vigna unguiculata var. spontanea, Vigna racemosa, Vigna radiata and the unidentified accession). The quantitative traits were subjected to statistical analysis using descriptive statistics and ANOVA. Our results revealed that ninety-five percent (95%) pod maturity ranged from 74.2 to 125.8 days in accession 3 of V. unguiculata and in accession 92 (V. racemosa), respectively. In addition, accession 14 of V. radiata recorded the highest weight for 100 seeds with a value of 4.8 g, while accession 18 of V. unguiculata had the lowest (1.48 g). The ANOVA showed significant differences for the accessions during each season (p ≤ 0.05). Seasonal effects (accession × season) were observed for some quantitative traits, such as the terminal leaflet length and width, time to 50% flowering and 95% pod maturity, pod length and 100-seed weight. Principal component analysis showed that reproductive traits, such as the time to 50% flowering, number of locules per pod, pod length, pod width and 100-seed weight, were the major traits that accounted for the variations among the wild Vigna accessions. The genetic relationship based on qualitative and quantitative traits showed three clusters among the wild Vigna accessions. Indeed, the diversity observed in this study could be used to select parents for breeding to improve the cultivated species of Vigna.

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Phenotypic variability studies in selected accessions of Nigerian wild cowpea (Vigna unguiculata L. Walp)

Cited by 2 publications

References 6 publications

Association Mapping for Drought Tolerance and Yield-Related Traits in Cowpea Accessions Using Genome-Wide Association Study and Population Structure Analysis

Association Mapping for Drought Tolerance and Yield-Related Traits in Cowpea Accessions Using Genome-Wide Association Study and Population Structure Analysis

Agro-Morphological Variability of Wild Vigna Species Collected in Senegal

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