文献类型： 外文期刊

第一作者： Tian Yu

作者： Tian Yu;Han Huanyong;Wang Fangyong;Liao Baopeng;Du Mingwei;Tian Xiaoli;Li Zhaohu;Tian Yu

作者机构：

关键词： Cotton; Irrigation amount; Chemical topping; Photosynthesis; Biomass accumulation

期刊名称：JOURNAL OF COTTON RESEARCH （ 影响因子：2.6； 五年影响因子：2.8 ）

ISSN： 2096-5044

年卷期： 2022 年 5 卷 1 期

页码：

收录情况： SCI

摘要： Background Cotton production in China is challenged by high labor input including manual topping (MT). Recently, to replace MT in the Xinjiang cotton region of China, mepiquat chloride (MC) was applied once more than the traditional multiple-application; this was designated as chemical topping (CT), but it is unclear whether the amount of irrigation needs to be adjusted to accommodate CT. Results The main plots were assigned to three drip irrigation amounts [300 (I-1), 480 (I-2), and 660 (I-3) mm], and the subplots were assigned to the CT treatments [450 (MC1), 750 (MC2), and 1 050 (MC3) mL center dot hm(-2) 25% MC] with MT as a control that was performed after early bloom. The optimum drip irrigation amount for CT was explored based on leaf photosynthesis, chlorophyll fluorescence, biomass accumulation, and yield. There were significant influences of drip irrigation, topping treatments and their interaction on chlorophyll fluorescence characteristics, gas exchange parameters and biomass accumulation characteristics as well as yield. The combination of I-2 and MC2 (I2MC2) performed best. Compared with I2MT, the net photosynthetic rate (Pn), stomatal conductance (Gs), transpiration rate (Tr), and photochemical quenching coefficient (qP) of I2MC2 significantly increased by 4.0%similar to 7.2%, 6.8%similar to 17.1%, 5.2%similar to 17.6%, and 4.8%similar to 9.6%, respectively, from the peak flowering to boll opening stages. Moreover, I2MC2 showed fast reproductive organ biomass accumulation and the highest seed cotton yield; the latter was 6.6%similar to 12.8% higher than that of I2MT. Further analysis revealed that a 25% MC emulsion in water (MCEW) application resulted in yield improvement by increasing Pn, phi PSII, and qP to promote biomass accumulation and transport to reproductive organs. Conclusion The results showed that the 480 mm drip irrigation combined with 750 mL center dot hm(-2) MC increased the rate of dry matter accumulation in reproductive organs by increasing Pn, phi PSII, and qP to improve photosynthetic performance, thus achieving higher yield.

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