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首页> 外文期刊>Genetic Resources and Crop Evolution >Genetic diversity in cultivated yam bean (Pachyrhizus spp.) evaluated through multivariate analysis of morphological and agronomic traits
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Genetic diversity in cultivated yam bean (Pachyrhizus spp.) evaluated through multivariate analysis of morphological and agronomic traits

机译：培养山药遗传多样性（Pachyrhizus SPP）通过多变量分析形态学和农艺性状评估

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摘要

Yam bean [Pachyrhizus DC.] is a legume genus of the subtribe Glycininae with three root crop species [P. erosus (L.) Urban, P. tuberosus (Lam.) Spreng., and P. ahipa (Wedd.) Parodi]. Two of the four cultivar groups found in P. tuberosus were studied: the roots of 'Ashipa' cultivars with low root dry matter (DM) content similar to P. erosus and P. ahipa are traditionally consumed raw as fruits, whereas 'Chuin' cultivars with high root DM content are cooked and consumed like manioc roots. Interspecific hybrids between yam bean species are generally completely fertile. This study examines the genetic diversity of the three crop species, their potentials for breeding and the identification of useful traits to differentiate among yam bean genotypes and accessions. In total, 34 entries (genotypes and accessions) were grown during 2000aEuro'2001 at two locations in Benin, West Africa, and 75 morphological and agronomical traits, encompassing 50 quantitative and 25 qualitative characters were measured. Diversity between entries was analyzed using principal component analysis, cluster analysis, multivariate analysis of variance and discriminant function analysis. Furthermore, phenotypic variation within and among species was investigated. Intra- and interspecific phenotypic diversity was quantified using the Shannon-Weaver diversity index. A character discard was tested by variance component estimations and multiple regression analysis. Quantitative trait variation ranged from 0.81 (for total harvest index) to 49.35% (for no. of storage roots per plant). Interspecific phenotypic variation was higher than intraspecific for quantitative traits in contrast to qualitative characters. Phenotypic variation was higher in overall for quantitative than qualitative traits. In general, intraspecific phenotypic variation ranged from 0.00 to 82.61%, and from 0.00 to 80.03% for quantitative and qualitative traits, respectively. Interspecific phenotypic variation ranged from 0.00 to 95.02%, and 0.00aEuro'81.58% for the two trait types, respectively. The Shannon-Weaver diversity index (H') was in general high and over 0.80 for most of the trait. Diversity within P. tuberosus was higher than within P. erosus and P. ahipa. Across the 50 quantitative and 25 qualitative traits, the Shannon-Weaver diversity index of intra- and interspecific variation was around 0.83 and 0.51, respectively and was lower for qualitative than for quantitative traits. Monomorphism was observed in eight qualitative traits and one quantitative character. The first, second and third principal components explained, respectively, 39.1, 21.3 and 8.3% of the total variation in all traits. Pachyrhizus erosus, P. ahipa, and P. tuberosus ('Chuin' and 'Ashipa') were clearly separated from each other by these analyses. Multivariate analysis of variance indicates significant differences between Pachyrhizus species for all individual or grouped traits. Discriminant function analysis revealed that the first two discriminant functions were almost significant. Biases due to unbalanced sample size used per species were small. Within each species a similar amount of diversity was observed and was determinable to 70% by only ten traits. We conclude that the cultivated yam bean species represent distinct genepools and each exhibits similarly large amounts of genetic diversity.
机译：山药豆[pachyrhizus dc。]是糖尿病甘氨酸的豆类属，具有三种根部作物物种[p. Erosus（L.）城市，P. Tuberosus（Lam。）Spreng。和P. AIPA（WEDD。）Parodi]。研究了P. Tuberosus中发现的四种种类群体中的两个具有高根DM含量的栽培品种烹饪和消耗，如Manioc根。山药豆种之间的间隙杂种通常是完全肥沃的。本研究探讨了三种作物物种的遗传多样性，它们的繁殖潜力和鉴定有用的性状，以区分山药豆基因型和探索。总共34项参赛作品（基因型和摘录）在2000AEURO'2001中生长在贝宁，西非和75个形态和农艺性状的两个地点，包括50个定量和25个定性特征。使用主成分分析，集群分析，方差多变量分析和判别函数分析分析条目之间的多样性。此外，研究了物种内部和中的表型变异。使用Shannon-Weaver多样性指数量化和三种特异性的表型多样性。通过方差分量估计和多元回归分析测试了角色丢弃。定量性状变异范围为0.81（总收获指数）至49.35％（否。每株植物的储存根）。与定性特征形成鲜明对比的定量性状的间隙表型变异高。总体上的表型变异比定性特征总体上较高。通常，分别为0.00至82.61％，分别为0.00至82.61％，分别为0.00至80.03％，分别为定量和定性的特征。三种特异性的三种特异性变异分别为0.00至95.02％，以及两种特征类型的0.00.Aeuro'81.58％。 Shannon-Weaver多样性指数（H'）一般高，大部分特质都超过0.80。 P. Tuberosus中的多样性高于P. Erosus和P. AIPA。在50个定量和25个定性特征上，分别的杂交织造织物的分集分别分别为0.83和0.51分，定性比定量性状更低。在八种定性特征和一种定量性质中观察到单体。第一个，第二和第三主成分分别在所有特征的总变化的39.1,21.3和8.3％中解释。 Pachyrhizus erosus，p. ahipa和p. tuberosus（'chuin'和'Ashipa'）通过这些分析显然彼此分开。多元差异分析表明所有个人或分组特征的Pachyrhizus物种之间的显着差异。判别函数分析显示，前两个判别功能几乎显着。由于每种物种使用的不平衡样本尺寸，偏差小。在每种物种内，观察到类似的多样性，并且可确定为70％仅为10个特征。我们得出结论，培养的山药豆种代表了明显的Genepools，每种遗传多样性都具有同样大量的遗传多样性。

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