VARIATION IN WATER-USE EFFICIENCY AND ITS COMPONENTS IN WHEAT .1. WELL-WATERED POT EXPERIMENT
VARIATION IN WATER-USE EFFICIENCY AND ITS COMPONENTS IN WHEAT .1. WELL-WATERED POT EXPERIMENT
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DOI：
10.2135/cropsci1993.0011183x003300020016x
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发表时间：
1993-03-01
期刊：
影响因子：
2.3
通讯作者：
WAINES, JG
中科院分区：
文献类型：
--
作者：
EHDAIE, B;WAINES, JG
小麦（Triticum aestivum L.）个品种为了便于研究这种变化，我们定义了WUE及其组成部分，以便可以评估每个组成性状对WUE变化的贡献。七个不同的面包小麦品种种植在重复的温室盆栽实验在良好的浇水条件下。WUE（籽粒产量与水分利用的比值）、蒸散效率（埃特，总干物质与水分利用的比值）和收获指数（HI，籽粒产量与总干物质的比值）存在显著的基因型差异。与现代半矮秆和矮秆品种相比，老高品种平均具有相对较高的埃特（3.95比2.67 g kg-1），但低得多的HI（0.35比0.53）。水分利用效率相近的品种，其组成性状表现出不同的模式。蒸散效率和HI分别占WUE基因型变异的59%和41%。通径分析表明，埃特对水分利用效率的直接效应大于HI。然而，由于埃特和HI呈负相关，它们的正直接效应被负间接效应相互抵消。碳同位素分辨率与水分利用效率（WUE）和埃特呈负相关（-0.62），与水分利用效率（HI）呈显著正相关（-0.43）。播后至成熟天数、株高、根干物重、地上部干物重与埃特呈正相关，与HI呈负相关。
Genetic variation exists for season-long water-use efficiency (WUE) among bread wheat (Triticum aestivum L.) cultivars. To facilitate the study of such variation, we define WUE and its components so that the contribution of each component trait to variation in WUE can be evaluated. Seven diverse bread wheat cultivars were grown in replicated glasshouse pot experiments under well-watered 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). Old tall cultivars, on average, had relatively higher ETE (3.95 vs. 2.67 g kg-1), but much lower HI (0.35 vs. 0.53) than modern semidwarf and dwarf cultivars. Cultivars with similar WUE showed different patterns of component traits. Evapotranspiration efficiency, and HI accounted for 59%, and 41%, respectively, of the genotypic variation in WUE. A path coefficient analysis revealed that ETE had a higher direct effect on WUE than did HI. However, their positive direct effects were counterbalanced by negative indirect effects via each other, because ETE and HI were negatively correlated. Carbon isotope discrimination showed a negative correlation with WUE (- 0.62) and ETE (- 0.84), but a positive correlation with HI (0.43). Days from planting to maturity, plant height, root dry matter, and shoot dry matter each had a positive correlation coefficient with ETE, but a negative correlation with HI.