| Effect of mulching methods on drought resistance physiology and grain weight formation of dryland wheat in post\|flowering flag leaf |
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| DOI：10.7606/j.issn.1000-7601.2023.04.15 |
| Key Words: dryland wheat mulching mode relative moisture content antioxidant grain formation |
| Author Name | Affiliation | | ZHANG Yao | College of Life Science and Technology, Gansu Agricultural University, Lanzhou, Gansu 730070, China | | CHENG Hongbo | College of Life Science and Technology, Gansu Agricultural University, Lanzhou, Gansu 730070, China
Key Laboratory of Arid Land Crop Science of Gansu Province, Lanzhou, Gansu 730070, China | | YANG Jiajia | College of Life Science and Technology, Gansu Agricultural University, Lanzhou, Gansu 730070, China | | MA Jiantao | College of Agronomy, Gansu Agricultural University, Lanzhou, Gansu 730070, China | | CHAI Shouxi | Key Laboratory of Arid Land Crop Science of Gansu Province, Lanzhou, Gansu 730070, China
College of Agronomy, Gansu Agricultural University, Lanzhou, Gansu 730070, China | | JI Wenning | College of Life Science and Technology, Gansu Agricultural University, Lanzhou, Gansu 730070, China | | ZHANG Shilin | College of Life Science and Technology, Gansu Agricultural University, Lanzhou, Gansu 730070, China |
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| Abstract: |
| Winter wheat ‘Kangzhuang 974’ was used as the experimental material during 2017 to 2018 and 2018 to 2019 in the central northwest dry rainfed agriculture zone. There were 3 treatments including straw strip mulching (SM), plastic film mulching (PM) and no mulching control (CK). The results showed that the effects of different mulching methods on the soil water content, temperature and antioxidant capacity of wheat during the grain\|filling period and the relationship between dry matter accumulation and grain weight formation after flowering were investigated. The results showed that the relative water content (RWC) of post\|flowering flag leaf gradually decreased and the malondialdehyde (MDA) content gradually increased as the growth stage progressed under both SM and PM groups. The range of PM decreasing and increasing was more significant compared with SM. Compared with CK, mulching significantly increased the antioxidant enzyme activity and osmoregulatory content of flag leaves after flowering. The longer the flowering time, the greater the increase in SM antioxidant enzyme activity, while PM mainly increased the antioxidant capacity of flag leaves 7 days after flowering. Grain weight of SM and PM increased by 14.3% and 19.1%, respectively, compared with CK (P<0.05). Correlation analysis showed that soil water (SW) was a key factor influencing the physiological activity of flag leaf, and increasing SW was beneficial in increasing RWC (r=0.84**), thus improving the antioxidant capacity of flag leaf, where RWC and ascorbate activity (ASA) were highly significantly positively correlated (r=0.82**). ASA and proline (Pro) were highly significantly positively correlated (r=0.94**). ASA and MDA were highly significantly negatively correlated (r=-0.93**). Antioxidant capacity and post\|flowering dry matter accumulation were found to be highly positively correlated (r=0.96**). Antioxidant capacity positively correlated with grain weight. In conclusion, the increase in grain weight was closely related to the increase in flag leaf RWC and its antioxidant capacity. Straw strip mulching had the best effect on improving the physiological activity of the flag leaf after flowering in wheat and can be suitable for application in dryland wheat of northwest China. |
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