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首页> 外文期刊>Field Crops Research >The potential contribution of wild barley (Hordeum vulgare ssp. spontaneum) germplasm to drought tolerance of cultivated barley (H. vulgare ssp. vulgare).
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The potential contribution of wild barley (Hordeum vulgare ssp. spontaneum) germplasm to drought tolerance of cultivated barley (H. vulgare ssp. vulgare).

机译：野生大麦（ Hordeum vulgare ssp。 spontaneum ）种质对栽培大麦（ H.vulgare ssp。）的耐旱性的潜在贡献低俗）。

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Improving drought tolerance has always been an important objective in many crop improvement programs and is becoming more important as one way of adapting crops to climate changes. However, due to its complexity, the genetic mechanisms underlying the expression of drought tolerance in plants are poorly understood and this trait is difficult to characterize and quantify. This study assessed the importance of the wild progenitor of cultivated barley, Hordeum spontaneum C. Koch, in contributing developmental and yield-related traits associated with drought tolerance and therefore its usefulness in breeding for improved adaptation to drought stress conditions. Fifty-seven fixed barley lines derived from crosses with two H. spontaneum lines (41-1 and 41-5) were evaluated in Mediterranean low rainfall environments with 10 improved varieties and three landraces for grain yield, developmental and agronomic traits. The study was conducted for three years (2004-2006) in a total of nine environments (location-year combinations), eight in Syria and one in Jordan, which were eventually reduced to seven due to a large error variance in two of them. There was significant genetic variation among the genotypes for most of the traits measured, as well as differential responses of genotypes across environments. Traits such as peduncle length, peduncle extrusion and plant height were positively correlated with grain yield in the dry environments. Differences in phenology were small and not significantly correlated with differences in grain yield under stress. Performances at the three highest yielding environments were much more closely correlated than those at the four stress environments. The GGE biplot analysis allowed identification of genotypes consistently best adapted to the lowest yielding environments and confirmed the existence of unique environments for identifying better adapted genotypes in the low rainfall environments of Syria. The top yielding lines in the driest of the seven environments derived mostly from crosses with H. spontaneum 41-1, while most of the improved varieties showed a positive genotype by environment (GE) interaction with the highest yielding environments. The results of the field experiments indicated that there was variation for grain yield under drought stress among barley genotypes, and that some of the lines derived from H. spontaneum had consistently superior specific adaptation to the range of severe stress conditions used in this study. The usefulness of H. spontaneum in breeding programs for stress conditions is likely to increase in view of the predicted increase in the occurrence of high temperatures and droughts.Digital Object Identifier http://dx.doi.org/10.1016/j.fcr.2010.09.011
机译：在许多作物改良计划中，提高耐旱性一直是一个重要目标，并且作为使作物适应气候变化的一种方式变得越来越重要。但是，由于其复杂性，人们对植物抗旱表达的遗传机制了解甚少，并且难以表征和量化该性状。这项研究评估了栽培大麦 Hordeum spontaneum Koch的野生祖先在促进与干旱耐受性相关的发育和产量相关性状方面的重要性，因此其在育种中用于改善对干旱胁迫的适应性很有用。条件。大麦的57条固定大麦系得自与2 H杂交的杂交。在地中海低降雨环境中对自然发芽系（41-1和41-5）进行了评估，该环境具有10个改良品种和3个地方品种，以提高谷物产量，发育和农艺性状。该研究在总共9个环境（位置-年份组合）中进行了三年（2004-2006），其中八个在叙利亚，一个在约旦，由于其中两个误差较大，最终减少到七个。对于大多数测得的性状，基因型之间存在显着的遗传变异，以及整个环境中基因型的差异响应。在干燥环境中，花序长度，花序挤压和株高等性状与籽粒产量呈正相关。物候方面的差异很小，并且与胁迫下谷物产量的差异没有显着相关。与在四个压力环境下的性能相比，在三个最高收益环境下的性能密切相关。 GGE双线图分析允许确定始终最适合最低产量环境的基因型，并确认存在独特的环境，可用于识别叙利亚的低降雨环境中更好适应的基因型。七个环境中最干燥的最高屈服线主要来自与H的杂交。自发41-1），而大多数改良品种在最高产量的环境中均表现出积极的基因型环境（GE）相互作用。田间试验的结果表明，在干旱胁迫下，大麦基因型之间的籽粒产量存在差异，并且某些株系来自 H。自发性对本研究中使用的严重应激条件范围的适应性一直很好。 H的有用性。考虑到高温和干旱的发生预计会增加，因此针对应激条件的繁殖计划中的自然发烟量可能会增加。数字对象标识符http://dx.doi.org/10.1016/j.fcr.2010.09 .011

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