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首页> 外文期刊>Genetic Resources and Crop Evolution >Diversity in Tanzanian pigeonpea [Cajanus cajan (L.) Millsp.] landraces and their response to environments
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Diversity in Tanzanian pigeonpea [Cajanus cajan (L.) Millsp.] landraces and their response to environments

机译：坦桑尼亚木豆[Cajanus cajan（L.）Millsp。]地方品种的多样性及其对环境的响应

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A total of 123 pigeonpea landraces collected from farmers’ fields in four pigeonpea growing regions of Tanzania were characterized and evaluated for 16 qualitative and 14 quantitative descriptors, and their response across three pigeonpea growing environments in Tanzania and Kenya determined. Polymorphism in the qualitative traits was relatively low among accessions and across collection regions. Collections from the northern highlands exhibited lower diversity in qualitative descriptors, especially physical grain characters, relative to the other three regions, an indication of farmer selection in response to market preferences. There were significant differences in agronomic traits among accessions and in genotype-by-environment interaction (GEI). High broad-sense heritability was recorded for days to flower, days to maturity, plant height, raceme number and 100 seed mass. Principal component analysis and clustering separated variability among the accessions according to days to flower, days to maturity, plant height, number of primary and secondary branches, and number of racemes per plant. There was close clustering within and between materials from the coastal zone, eastern plains and southern plains with the northern accessions distinctly separated and with wide dispersion within them. Overall, two diversity clusters were evident with coastal, eastern and southern landraces in one diversity cluster and northern highlands landraces in another cluster. This diversity grouping established potential heterotic groups which may be used in crosses to generate new cultivars adapted to different pigeonpea growing environments with consumer acceptability. The grouping may also form a basis of forming a core collection of this germplasm representing the variability available.
机译：从坦桑尼亚四个木豆种植区的农民田间收集的总共123个木豆地方品种进行了表征和评估，得到16个定性和14个定量描述子，并确定了它们在坦桑尼亚和肯尼亚的三个木豆生长环境中的反应。在种质之间和整个采集区域，定性性状的多态性相对较低。相对于其他三个地区，北部高原地区的采集品在质性指标上的多样性较低，尤其是谷物的物理特征，这表明农民是根据市场偏好进行选择的。不同种质之间的农艺性状和基因型-环境相互作用（GEI）存在显着差异。在开花天数，成熟天数，植物高度，总状花序数和100种子质量方面都记录了高广义的遗传力。主成分分析和聚类根据花的天数，成熟的天数，植物的高度，一级和二级分支的数量以及每个植物的总消旋体的数量，将种质之间的变异性分开。沿海地带，东部平原和南部平原的物质在其内部和之间紧密聚集，而北部种质则明显分开并且在它们内部广泛分布。总体而言，两个多样性集群是明显的，一个集群中有沿海，东部和南部的地方种族，另一个集群中有北部高地的地方种族。这种多样性分组建立了潜在的杂种基团，这些杂种基团可以在杂交中用于产生新的品种，以适应消费者接受的不同木豆生长环境。分组还可以形成形成该种质代表可用变异性的核心集合的基础。

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