Yield response of rice (Oryza sativa L.) genotypes to different types of drought under rainfed lowlands -: Part 2.: Selection of drought resistant genotypes
Yield response of rice (Oryza sativa L.) genotypes to different types of drought under rainfed lowlands -: Part 2.: Selection of drought resistant genotypes
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DOI：
10.1016/s0378-4290(01)00195-2
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发表时间：
2002-01-01
影响因子：
5.8
通讯作者：
O'Toole, JC
中科院分区：
文献类型：
--
作者：
Pantuwan, G;Fukai, S;O'Toole, JC
干旱经常使低地水稻减产。在泰国东北部干旱地区进行了一系列试验，研究不同的干旱低地水稻基因型对干旱胁迫环境的产量反应的幅度和一致性，并研究鉴定赋予抗旱性的基因型的方法。128个基因型在非胁迫和4种不同类型的干旱胁迫条件下生长。研究了干旱条件下产量的基因型变异与遗传产量潜力、开花时间和开花延迟的关系，以及与干旱反应指数（DRI）的关系，DRI消除了潜在产量和开花时间对胁迫下产量的影响，开花前发生的干旱胁迫通常推迟了基因型的开花时间，开花延迟与籽粒产量呈负相关，结实率和实粒率。开花时间延迟较长的基因型在干旱早期提取了更多的水分，因此，具有较高的水分亏缺。它们始终与干旱下较大的产量减少有关，在一个实验中，DRI较小。然而，基因型，不同的干旱胁迫条件下，有不同的DRI估计在整个干旱胁迫实验的不同基因型的一致性。结果表明，利用灌溉控制和干旱试验环境，可以通过DRI或延迟开花来鉴定抗旱基因型。然而，选择将根据干旱条件的类型而有所不同。不同干旱条件下DRI和开花延迟的估计值的不一致性反映了在干旱低地条件下观察到的各种类型干旱下谷物产量的大基因型与环境相互作用的性质。(C)，2002 Elsevier Science B.V.保留所有权利。
Drought frequently reduces grain yield of rainfed lowland rice. A series of experiments were conducted in drought-prone northeast Thailand to study the magnitude and consistency of yield responses of diverse, rainfed lowland rice genotypes to drought stress environments and to examine ways to identify genotypes that confer drought resistance. One hundred and twenty-eight genotypes were grown under non-stress and four different types of drought stress conditions. The relationship of genotypic variation in yield under drought conditions to genetic yield potential, flowering time and flowering delay, and to a drought response index (DRI) that removed the effect of potential yield and flowering time on yield under stress was examined.Drought stress that developed prior to flowering generally delayed the time of flowering of genotypes, and the delay in flowering was negatively associated with grain yield, fertile panicle percentage and filled grain percentage. Genotypes with a longer delay in flowering time had extracted more water during the early drought period, and as a consequence, had higher water deficits. They were consistently associated with a larger yield reduction under drought and in one experiment with a smaller DRI. Genotypes, however, responded differently to the different drought stress conditions and there was no consistency in the DRI estimates for the different genotypes across the drought stress experiments. The results indicate that with the use of irrigated-control and drought test environments, genotypes with drought resistance can be identified by using DRI or delay in flowering. However, selections will differ depending on the type of drought condition. The inconsistency of the estimates in DRI and flowering delay across different drought conditions reflects the nature of the large genotype-by-environment interactions observed for grain yield under various types of drought in rainfed lowland conditions. (C), 2002 Elsevier Science B.V. All rights reserved.