Traits of relevance to improve yield under terminal drought stress in chickpea (C. arietinum L.)
Traits of relevance to improve yield under terminal drought stress in chickpea (C. arietinum L.)
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DOI：
10.1016/j.fcr.2013.02.011
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发表时间：
2013-04-01
影响因子：
5.8
通讯作者：
Tobita, S.
中科院分区：
文献类型：
--
作者：
Kashiwagi, J.;Krishnamurthy, L.;Tobita, S.
在鹰嘴豆（鹰嘴豆I.）中，末期干旱是限制种子产量的主要限制因素。重要的是要确定这些干旱相关性状的相对重要性，以优先考虑它们在耐旱性改良育种。干旱反应指数（DRI）是一个不受干旱逃逸和产量潜力影响的指标，通过将干旱反应指数与各性状相关联，对干旱条件下与产量相关性较好的性状进行了研究。21个基因型与已知的多样性在干旱响应。ICC 7571基因型是一个新发现的高度耐旱的鹰嘴豆种质。DRI与作物生长速率（CGR）呈显著正相关，与水分利用效率（WUE）呈显著负相关。DRI与单位面积荚果数呈正相关，与干旱强度无关。在严重干旱胁迫下，收获指数和分配率（p）与DRI呈显著正相关。磷作为与产量相关的性状，在严重干旱条件下进一步增强。这种适应性表达表明，在耐旱育种中，p被认为是一个关键性状。(C)2013爱思唯尔有限公司版权所有。
In chickpea (Cicer arietinum I.), terminal drought is a major constraint that limits seed yield. It is important to establish the relative importance many of these drought-related traits for prioritizing their consideration in breeding for drought tolerance improvements. By associating various traits with the drought response index (DRI), a good indicator devoid of the confounding effects of drought escape and yield potential, well associated traits to grain yield under drought were investigated. Twenty-one genotypes with known diversity in drought response were used. Genotype ICC 7571 was identified newly as a consistent and highly drought tolerant chickpea germplasm. The DRI showed significant positive association with crop growth rate (CGR) and negative association with water use efficiency (WUE) in both the years. The DRI also showed a positive association with the pod quantity per unit area irrespective of the drought intensity. The harvest index and the rate of partitioning (p) showed a close positive association with DRI under severe drought stress. The relationship of p, as an associated trait with yield, intensified further under severe drought. This adaptive expression suggests that p to be considered as a critical trait while breeding for drought tolerance. (C) 2013 Elsevier B.V. All rights reserved.