Phytohormones are important for the growth and development of plants. The objective of the experiment was to investigate the effect of foliar application of uniconazole (UCZ) at the four-leaf stage on hormone crosstalk and production of winter wheat. An experiment was carried out during 2015–2016 and 2016–2017 growth season in a semi-arid region, where UCZ at a concentration of 0 (CK, distilled water), 15 (FU 15 ), 30 (FU 30 ), and 45 (FU 45 ) mg L −1 were sprayed on wheat crop at the four-leaf stage at a rate of 138.8 mL m −2 . UCZ alters the endogenous hormone contents in flag leaves and in grains. UCZ inhibited gibberellic acid (GA) in flag leaves and in grains where the lower GA with UCZ improved the zeatin + zeatin riboside (Z + ZR) and abscisic acid (ABA) contents. The lower GA and higher Z + ZR and ABA contents with UCZ-treated plants improved the chlorophyll content and canopy apparent photosynthesis (CAP) as well as the grain-filling characteristics. The Z + ZR and ABA in flag leaves were positively correlated with chlorophyll content and CAP value while negatively with GA. Moreover, the Z + ZR and ABA were positively correlated with maximum grain weight, mean grain-filling rate, and maximum grain-filling rate, while negatively with GA level. Treatment FU 30 significantly improved the chlorophyll content, CAP value, spike weight, grain-filling characteristics, and hormone contents of Z + ZR and ABA while it decreased the GA level. The hormone crosstalk with UCZ significantly increased the yield of wheat crop, where FU 30 treatment performs better.

中文翻译：

---

半干旱气候条件下，单环唑引发冠层表观光合作用和籽粒灌浆的激素变化

植物激素对植物的生长和发育很重要。试验的目的是研究四叶期叶面喷施利康唑（UCZ）对激素串扰和冬小麦产量的影响。在 2015-2016 和 2016-2017 生长季节在半干旱地区进行了一项试验，其中 UCZ 浓度为 0（CK，蒸馏水）、15（FU 15 ）、30（FU 30 ）和 45 (FU 45) mg L -1 以138.8 mL m -2 的速率喷洒在四叶期的小麦作物上。UCZ 改变了旗叶和谷物中的内源激素含量。UCZ 抑制旗叶和谷物中的赤霉酸 (GA)，其中含有 UCZ 的较低 GA 提高了玉米素 + 玉米素核苷 (Z + ZR) 和脱落酸 (ABA) 的含量。UCZ 处理的植物较低的 GA 和较高的 Z + ZR 和 ABA 含量提高了叶绿素含量和冠层表观光合作用 (CAP) 以及籽粒灌浆特性。旗叶中Z+ZR和ABA与叶绿素含量和CAP值呈正相关，与GA呈负相关。此外，Z+ZR和ABA与最大粒重、平均灌浆率和最大灌浆率呈正相关，与GA水平呈负相关。FU 30处理显着提高了Z+ZR和ABA的叶绿素含量、CAP值、穗重、灌浆特性和激素含量，同时降低了GA水平。与UCZ的激素串扰显着提高了小麦作物的产量，其中FU 30处理效果更好。