Irrigation methods affect wheat flag leaf senescence and chlorophyll fluorescence in the North China Plain

文献类型： 外文期刊

第一作者： Xu, J. K.

作者： Xu, J. K.;Shi, Y.;Yu, Z. W.;Zhao, J. Y.

作者机构：

关键词： Supplemental irrigation based on soil moisture;Wheat;Superoxide dismutase activity;Actual photochemical efficiency of PSII;Grain yield

期刊名称：INTERNATIONAL JOURNAL OF PLANT PRODUCTION （ 影响因子：2.017； 五年影响因子：1.85 ）

ISSN： 1735-6814

年卷期： 2017 年 11 卷 3 期

页码：

收录情况： SCI

摘要： The water resource shortage in North China Plain is an increasing threat to the sustainability of wheat (Triticum aestivum L.) production. A two-year field experiment was conducted to examine the effects of two supplemental irrigation (SI) methods on wheat flag leaf senescence, chlorophyll fluorescence and grain yield. The following field treatments were conducted: no irrigation (W-0); SI with 60 mm of water at jointing and anthesis stages (local quota SI, W-ck); SI based on the relative soil water content (SWC) of 0-40 cm soil layers with 65% field capacity (FC) at jointing stage and 70% FC at anthesis stage (W-1); SI based on SWC of same soil layers with 70% FC at the jointing and anthesis stage (W-2); and SI based on the SWC of same soil layers with 75% FC at jointing stage and 70% FC at anthesis stage (W-3). Results showed that W-0 accelerated flag leaf senescence and had reduced grain yield. Among irrigation treatments, W-2 (and W-3 in 2013-2014) significantly increased flag leaf water potential from 7 to 28 days after anthesis (DAA) compared with W-ck and W-1. Superoxide dismutase activity, catalase activity of W-2 increased by 15.41% and 14.96% compared with those in W-ck, resulting in the significantly decreased concentration of malondialdehyde and increased concentration of soluble protein at 14-28 DAA. The F-v/F-m at 21-28 DAA and the Phi PSII, qP and NPQ at 14-28 DAA for W-2 (and W-3 in 2013-2014) were also significantly higher than those of W-ck and W-1. Eventually, grain yield, water use efficiency and irrigation benefit of W-2 were 8704.54 kg ha(-1), 20.86 kg ha(-1) mm(-1) and 31.44 kg ha(-1) mm(-1), respectively, which were the highest among those of all the treatments. These values increased by 5.82%, 9.65% and 6.00%, respectively, relative to those of W-ck. In conclusion, the SI based on 0-40 cm soil layer and use of an appropriate relative SWC (both 70% FC at the jointing and anthesis stages) can reduce irrigation amount, delay leaf senescence and improve grain yield and water use efficiency.

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