Great understanding of the genotypic difference in diurnal stomatal conductance (g_s) pattern and the key determinants of the pattern is important for saving water by adopting cultivars appropriately. Fifteen wheat genotypes were studied under different soil conditions and various meteorological conditions with pot cultivation in rain shelter for two years. Genotype and air humidity were found to be key determinants of diurnal g_s pattern. All genotypes under low relative humidity (LRH) and most genotypes under high relative humidity (HRH) displayed a gradual decline pattern from morning through the afternoon. Under moderate relative humidity (MRH), all genotypes present a single‐peak curve pattern, but they differed in peak time, which may lead to unreliable g_s comparison between genotypes and get ostensible contrasting materials. The stomatal conductance was significantly different among genotypes under LRH and the increased g_s magnitude is also significantly different when it was compared between LRH and HRH. The present results provide new thinking for selecting and adopting appropriate cultivars with specific stomata traits for the area with various meteorological conditions.

中文翻译：

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大气湿度和基因型是昼夜气孔导度模式的关键决定因素

充分了解昼夜气孔导度（g _s）模式的基因型差异以及该模式的关键决定因素对于通过适当采用栽培品种来节水很重要。在雨棚里种植盆栽两年，研究了在不同土壤条件和不同气象条件下的十五种小麦基因型。基因型和空气湿度被发现是昼间的关键决定因素克_小号图案。在低相对湿度（LRH）下的所有基因型和在高相对湿度（HRH）下的大多数基因型从早上到下午显示出逐渐下降的模式。在中等相对湿度（MRH）下，所有基因型均呈现单峰曲线模式，但峰值时间有所不同，这可能导致不可靠克_小号基因型，并获得表面上的对比的材料之间的比较。在LRH和HRH之间比较，气孔导度在不同基因型之间显着不同，并且增加的g _s幅度也显着不同。本研究结果为选择和采用具有多种气象条件的地区具有特定气孔特征的适宜品种提供了新思路。