Assessment of Genetic Diversity of Bambara Groundnut Accessions [Vigna subterranea (L) Verdcourt] in Sahelian Zone of Niger

Abdou Zakary Yaou Ibrahim, H. Amadou, A. Alhassane
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引用次数: 1

Abstract

The agro-morphological characterization of plant genetic resources is crucial to understand the phenotypic and genotypic relationships between different crop varieties. Bambara groundnut (Vigna subterranea) is a grain legume grown worldwide due to its high nutritional values, nitrogen-fixing ability, and drought tolerance. To assess the existing genotypic and phenotypic diversity within Bambara groundnut accessions and to estimate the genetic parameters guiding future varietal improvement programs, 22 Bambara groundnut accessions were characterized in the Sahelian zone of Niger. Thus, the coefficient of variation ranged from 2.42% to 48.25%, and 7 of the 22 parameters measured presented high coefficients of variation (CV˃20%). Yield had positive high correlation with shell weight (r=0.56), 100-seed weight (r=0.61), and seed weight (r=0.99). The highest GCV and PCV were observed in number of seeds per plant (PVC=35.05% and GCV=22.65%), hull weight (PVC=85.91% and GCV=25.51%) and dry biomass weight (PVC=36. 61% and GCV=23.66%), for a respective heritability and genetic gain of: (h2b=41.58%; GA=30.03%), (h2b=8.82%; GA=15.60%) and (h2b=41.76%; GA=31.49%). The highest heritability is observed in the number of leaves (92.40%) and the date of maturity (92.08%). Emergence date revealed high heritability and genetic gain (h2b=78.77% and GA=20%). Parameters with high heritability and genetic gain (h2b≥60% and GA≥20%), are the least influenced by the environment. So, direct selection for improvement of these traits may be beneficial. To authenticate genetic inequality, principal component analysis (PCA) and hierarchical ascending clustering (HAC) were performed. The results showed a great agro-morphological diversity divided into four different groups, for the studied characters. Group 3 (4 accessions) and group 1 (3 accessions) are the high yielding accessions, while group 4 (8 accessions) and group 2 (7 accessions) are the lower yielding accessions. ...................
尼日尔萨赫勒地区班巴拉花生遗传多样性评价[Vigna subteranea (L) Verdcourt]
植物遗传资源的农业形态特征对了解不同作物品种间的表型和基因型关系至关重要。班巴拉花生(Vigna subteranea)是一种谷物豆科植物,因其高营养价值,固氮能力和耐旱性而在世界范围内种植。为评价班巴拉花生种质资源的基因型和表型多样性,并对未来品种改良计划提供遗传参数指导,对尼日尔萨赫勒地区22个班巴拉花生种质资源进行了分析。变异系数在2.42% ~ 48.25%之间,其中7个参数的变异系数较高(CV≤20%)。产量与壳重(r=0.56)、百粒重(r=0.61)、种子重(r=0.99)呈正相关。单株种子数(PVC=35.05%, GCV=22.65%)、壳重(PVC=85.91%, GCV=25.51%)和干生物量(PVC=36)的GCV和PCV最高。61%, GCV=23.66%),遗传力和遗传增益分别为:(h2b=41.58%;GA = 30.03%), (h2b = 8.82%;GA=15.60%), h2b=41.76%;GA = 31.49%)。遗传力最高的是叶片数(92.40%)和成熟期(92.08%)。出苗期遗传力和遗传增益较高(h2b=78.77%, GA=20%)。遗传力和遗传增益较高的参数(h2b≥60%,GA≥20%)受环境影响最小。因此,直接选择这些性状的改进可能是有益的。为了验证遗传不平等,采用了主成分分析(PCA)和层次上升聚类(HAC)。结果表明,所研究性状的农业形态多样性很大,可分为4个不同的类群。第3组(4个品种)和第1组(3个品种)为高产品种,第4组(8个品种)和第2组(7个品种)为低产品种. ...................
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