Development of core collection in pigeonpea [Cajanus cajan (L.) Millspaugh] using geographic and qualitative morphological descriptors
Development of core collection in pigeonpea [Cajanus cajan (L.) Millspaugh] using geographic and qualitative morphological descriptors
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DOI：
10.1007/s10722-004-6152-7
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发表时间：
2005-12-01
影响因子：
2
通讯作者：
Singh, S
中科院分区：
文献类型：
--
作者：
Reddy, LJ;Upadhyaya, HD;Singh, S
木豆是半干旱热带地区小农种植的重要豆类作物。迄今为止，大多数木豆栽培品种都是从地方品种中挑选出来的，遗传基础很窄。随着作物向较新地区的推广，对当地具有重要意义的问题将得到解决。因此，需要一种经济上可行的和更快的种质评价机制，如核心种质。本文描述了从56个国家收集的12,153份木豆种质资源的核心种质的发展，这些种质资源保存在印度帕坦切鲁的ICRISAT。来自56个国家的种质资源主要根据地理来源分为14个聚类。14个定性形态性状的数据被用于Ward方法的聚类形成。从每个聚类中随机选择约10%的种质，构成包括1290份种质的核心种质。平均数比较采用Newman-Keuls检验，方差比较采用Levene检验，频率分布比较采用卡方检验，表明核心种质与整个种质的各性状相似，核心种质保持了整个种质的遗传变异性。不同性状的Shannon-Weaver多样性指数在核心种质和完整种质中也相似。核心种质中保留了整个种质中不同性状之间所有重要的表型关联。在本研究中构成的核心收集有利于鉴定有用的性状经济和迅速用于木豆改良。
Pigeonpea is an important pulse crop grown by smallholder farmers in the semi-arid tropics. Most of the pigeonpea cultivars grown to date are selections from the landraces, with a narrow genetic base. With the expansion of the crop to newer areas, problems of local importance are to be addressed. Hence, an economically feasible and faster germplasm evaluation mechanism, such as a core collection, is required. This article describes the development of core collection from 12,153 pigeonpea accessions collected from 56 countries and maintained at ICRISAT, Patancheru, India. The germplasm accessions from 56 countries were placed under 14 clusters based primarily on geographic origin. Data on 14 qualitative morphological traits were used for cluster formation by Ward's method. From each cluster approximate to 10% accessions were randomly selected to constitute a core collection comprising 1290 accessions. Mean comparisons using Newman-Keuls test, variances' comparisons by Levene's test, and comparison of frequency distribution by chi(2)-test indicated that the core collection was similar to that of the entire collection for various traits and the genetic variability available in the entire collection is preserved in the core collection. The Shannon-Weaver diversity index for different traits was also similar for both entire and core collection. All the important phenotypic associations between different traits available in the entire collection were preserved in the core collection. The core collection constituted in the present study facilitates identification of useful traits economically and expeditiously for use in pigeonpea improvement.