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首页> 外文会议>ACIAR Proceedings no.116; CARDI International Conference on Research on Water in Agricultural Production in Asia for the 21st Century; 20031125-28; Phnom Penh(KH) >Drought response index for identifying drought resistant genotypes for rainfed lowland rice in Cambodia
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Drought response index for identifying drought resistant genotypes for rainfed lowland rice in Cambodia

机译：干旱响应指数，用于识别柬埔寨雨养低地水稻的抗旱基因型

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摘要

Drought is a major problem for rice producers in the rainfed lowlands with losses in grain yield estimated at 11-58%. To be effective the appropriate drought tolerance traits for the environments and their genotypic variation need to be identified routinely and reliably. Experiments with main plots of controlled water conditions-of well-watered and managed drought and with a range of genotypes including local collections, exotic materials and breeding lines-were conducted at two sites, for four years, in Cambodia. The genotypes were evaluated for their interactive performance in yield under the different water conditions and for the drought adaptive traits of phenology, flower delay (under drought) and yield potential. A technique to routinely provide a managed drought environment in Cambodia was developed where the drought intensity ranged from 12-46%, which is similar to that in the target environments. The drought occurred mainly as a reproductive drought, again consistent with the target environments. There were significant interactions for yield among the genotype grown under the well watered and drought conditions. Early flowering was found to be a good mechanism for escaping drought and yield potential was an indicator of performance under medium drought conditions (up to a drought intensity of 30% yield reduction). High yield potential was found mostly in the intermediate flowering genotypes. To avoid these confounding effects of maturity and yield potential we measured drought response index (DRI). There was a significant difference among the genotypes in DRI, which ranged from -0.79 to 0.58 and there was a level of genotypic consistency of the trait based on pattern analysis across seven environments. DRI was significantly associated with yield under drought (R~2 = 0.40~(**)). A routine approach for selecting drought tolerance in rainfed lowland rice in Cambodia, based on these findings, is discussed.
机译：干旱是雨养低地稻米生产者面临的主要问题，谷物单产损失估计为11-58％。为了有效地对环境进行适当的耐旱性状及其基因型变异，需要常规和可靠地鉴定。在柬埔寨，在两个地点进行了为期四年的试验，试验的水样条件受控，水量适中，干旱得到控制，并进行了基因型分析，包括本地采集，外来材料和育种系。评价基因型在不同水分条件下在产量上的相互作用表现，以及在干旱物候，花延迟（干旱下）和产量潜力方面的干旱适应性状。开发了一种在柬埔寨常规提供有管理的干旱环境的技术，该技术的干旱强度在12-46％之间，与目标环境中的干旱强度相似。干旱主要是生殖干旱，再次符合目标环境。在水分充足和干旱条件下生长的基因型之间，产量之间存在显着的相互作用。发现早花是逃避干旱的良好机制，单产潜力是中度干旱条件下（干旱强度最多降低30％）表现的指标。在中等开花基因型中发现了高产潜力。为了避免成熟度和单产潜力的这些混杂影响，我们测量了干旱响应指数（DRI）。根据七个环境中的模式分析，DRI中的基因型之间存在显着差异，范围从-0.79到0.58，并且性状的基因型一致性水平较高。在干旱条件下，DRI与产量显着相关（R〜2 = 0.40〜（**））。基于这些发现，讨论了在柬埔寨雨养低地水稻中选择耐旱性的常规方法。

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