VARIATION IN WATER-USE EFFICIENCY AND ITS COMPONENTS IN WHEAT .2. POT AND FIELD EXPERIMENTS
VARIATION IN WATER-USE EFFICIENCY AND ITS COMPONENTS IN WHEAT .2. POT AND FIELD EXPERIMENTS
复制标题
DOI：
10.2135/cropsci1995.0011183x003500060017x
复制
发表时间：
1995-11-01
期刊：
影响因子：
2.3
通讯作者：
EHDAIE, B
中科院分区：
文献类型：
--
作者：
EHDAIE, B
人们提出了两种模型来促进春季面包小麦（Triticum aestivum L.）季节性水分利用效率（WUE）及其组成部分的遗传变异研究。这些模型用于估计每个组成性状对 WUE 变化的贡献。在浇水良好和干旱的条件下，通过重复盆栽和田间试验种植了八个不同的面包小麦品种。在 WUE（谷物产量与用水量之比）、蒸散效率（ETE，总干物质与用水量之比）和收获指数（HI，谷物产量与总干物质之比）方面观察到显着的基因型变异。平均而言，现代矮品种在浇水良好（1.225 vs. 0.984 g kg(-1)）和干旱条件下的 WUE 高于老高品种。 （1.198 vs. 0.860 g kg(-1)）罐条件，主要是由于 HI 较高。两个老高品种的 ETE 值最高，收获指数和 ETE 分别占网浇水和干旱条件下 WUE 变化的 85% 和 15%，以及 WUE 变化的 81% 和 19%。收获指数对WUE的直接影响高于ETE，且与WUE的相关性较高，HI与ETE的负相关不显着，碳同位素辨别（Delta）在水分充足（-0.82）和干旱（-0.68）处理中与ETE呈负相关，田间条件下现代矮品种的产量和HI平均高于老高品种，干旱条件下平均Delta较低（千分之 17.9）高于浇水良好的条件下（千分之 18.9），在孕穗期和开花期估计的植物生长率与基于谷物产量的干旱敏感性指数呈负相关，干旱敏感性指数与 Delta 不相关。小麦的水分利用效率可以通过提高蒸腾效率或 ETE 来提高。
Two models have been suggested to facilitate the study of genetic variation for seasonal water-use efficiency (WUE) and its components in spring bread wheat (Triticum aestivum L.). These models were used to estimate the contribution of each component trait to variation in WUE, Eight diverse bread wheat cultivars were grown in replicated pot and field experiments under well-watered and droughted conditions. Significant genotypic variation was observed for WUE (ratio of grain yield to water used), evapotranspiration efficiency (ETE, ratio of total dry matter to water used), and harvest index (HI, ratio of grain yield to total dry matter), Modern short cultivars, on average, had higher WUE than old tall cultivars in well-watered (1.225 vs. 0.984 g kg(-1)) and droughted (1.198 vs. 0.860 g kg(-1)) pot conditions, due mainly to higher HI. Two old tall cultivars exhibited highest values for ETE, Harvest index and ETE accounted for 85 and 15% and for 81 and 19% of variation in WUE in web-watered and droughted conditions, respectively. Harvest index had a higher direct effect and was more highly associated with WUE than ETE, The negative correlation between HI and ETE was not significant, Carbon isotope discrimination (Delta) showed negative correlation with ETE in well-watered (-0.82) and droughted (-0.68) treatments, Grain yield and HI of modern short cultivars, on average, were higher than those of old tall cultivars under field conditions, Mean Delta was lower in droughted (17.9 parts per thousand) than in well-watered (18.9 parts per thousand) held conditions, Plant growth rates estimated at boot stage and at anthesis were negatively associated with a drought susceptibility index based on grain yield, Drought susceptibility index was not correlated with Delta. Water-use efficiency in wheat could be improved by improving either transpiration efficiency or ETE.