The large-effect drought-resistance QTL qtl12.1 increases water uptake in upland rice
The large-effect drought-resistance QTL qtl12.1 increases water uptake in upland rice
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DOI：
10.1016/j.fcr.2008.07.010
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发表时间：
2009-02-10
影响因子：
5.8
通讯作者：
Atlin, Gary
中科院分区：
文献类型：
--
作者：
Bernier, Jerome;Serraj, Rachid;Atlin, Gary
干旱胁迫是限制旱稻产量的最重要的非生物因子。鉴定赋予改进的抗旱性的数量性状基因座（QTL）可促进育种进展。我们先前在Vandana/Way Rarem群体中定位了一个对严重干旱胁迫（qtl12.1）下的籽粒产量有很大影响的QTL。在本文中，我们提供了一系列实验的结果，这些实验研究了qtl12.1在干旱条件下影响谷物产量的生理机制。我们进行了详细的植物水分状况测量的一个子集的线具有相似的作物生长期，但在qtl12.1在田间（24个基因型）和温室（14个基因型）条件下的对比基因型。证实了qtl12.1的Way Rare衍生等位基因主要通过在水分限制条件下略微改善（7%）植物水分吸收来改善干旱下的谷物产量。与该等位基因相关的吸水量的这种明显小的增加可以解释在田间条件下观察到的对产量的大的影响。我们的研究结果表明，这种改善植物水分吸收可能与改善根系构型。(C)2008 Elsevier B.V.保留所有权利。
Drought stress is the most important abiotic factor limiting upland rice yields. Identification of quantitative trait loci (QTL) conferring improved drought resistance may facilitate breeding progress. We previously mapped a QTL with a large effect on grain yield under severe drought stress (qtl12.1) in the Vandana/Way Rarem Population. In the current paper, we present results from a series of experiments investigating the physiological mechanism(s) by which qtl12.1 affects grain yield under drought conditions. We performed detailed plant water status measurements on a subset of lines having similar crop growth duration but contrasting genotypes at qtl12.1 under field (24 genotypes) and greenhouse (14 genotypes) conditions. The Way Rarem-derived allele of qtl12.1 was confirmed to improve grain yield under drought mainly through a slight improvement (7%) in plant water uptake under water-limited conditions. Such an apparently small increase in water uptake associated with this allele could explain the large effect on yield observed under field conditions. Our results suggest that this improvement of plant water uptake is likely associated with improved root architecture. (C) 2008 Elsevier B.V. All rights reserved.