The irrigating winter wheat one or two times each season was practiced in Huanghuai Winter Wheat Region in order to reduce the over-exploitation of groundwater. In this study, plant height (PH) and its relationship with yield were analyzed in a field study conducted over three growing seasons with 102 wheat varieties irrigated zero to two times at different growth stages. Here, we found that irrigation at the jointing stage increased wheat PH by 6.60–9.70%. Whereas irrigation at the early milking stage had almost no effect on it. Against the wildtype alleles Rht-B1a and Rht-D1a , the genetic background of Rht-B1b and Rht-D1b significantly reduced PH by 14.40–15.50% and 16.90–19.10%, respectively. The combined Rht-B1b and Rht-D1b can reduce PH by 29.10–32.50%. PH was strongly, negatively correlated with grain yield in jointing irrigation (W1) or jointing + milking irrigation (W2) over three growing seasons. In contrast, a significant positive correlation was detected in no-irrigation (W0) in the 2012/2013 wheat growing season, yet no correlation was found in 2013/2014 and 2014/2015. PH was positively correlated with drought coefficient (DRC) in W1 and W2. These results augment our understanding of the relationship between PH and grain yield in different irrigation regimes and provide PH traits for wheat improvement on water saving.

中文翻译：

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不同灌溉方式下小麦株高及其与产量的关系

黄淮冬小麦区每季浇灌冬小麦1-2次，以减少地下水的过度开采。在这项研究中，对 102 个小麦品种在三个生长季节进行的田间研究分析了植物高度 (PH) 及其与产量的关系，在不同的生长阶段进行了 0 到 2 次灌溉。在这里，我们发现拔节期的灌溉使小麦 PH 值提高了 6.60-9.70%。而早期挤奶阶段的灌溉对其几乎没有影响。针对野生型等位基因 Rht-B1a 和 Rht-D1a，Rht-B1b 和 Rht-D1b 的遗传背景分别显着降低了 14.40-15.50% 和 16.90-19.10% 的 PH。Rht-B1b 和 Rht-D1b 的组合可以将 PH 降低 29.10-32.50%。PH 强烈，在三个生长季节，拔节灌溉（W1）或拔节+挤奶灌溉（W2）与谷物产量呈负相关。相比之下，2012/2013 小麦生长季的无灌溉（W0）检测到显着的正相关，但在 2013/2014 和 2014/2015 没有发现相关性。PH 值与 W1 和 W2 的干旱系数 (DRC) 呈正相关。这些结果加深了我们对不同灌溉制度下 PH 值与粮食产量之间关系的理解，并为小麦节水改良提供了 PH 值特性。PH 值与 W1 和 W2 的干旱系数 (DRC) 呈正相关。这些结果加深了我们对不同灌溉制度下 PH 值与粮食产量之间关系的理解，并为小麦节水改良提供了 PH 值特性。PH 值与 W1 和 W2 的干旱系数 (DRC) 呈正相关。这些结果加深了我们对不同灌溉制度下 PH 值与粮食产量之间关系的理解，并为小麦节水改良提供了 PH 值特性。