| Effects of saline and alkaline stresses on growth and nutrient uptake of cotton |
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| DOI：10.7606/j.issn.1000-7601.2022.04.03 |
| Key Words: cotton saline stress alkaline stress antioxidant enzyme nutrient uptake |
| Author Name | Affiliation | | GUO Jiaxin | Department of Resources and Environmental Sciences, Shihezi University, Shihezi, Xinjiang 832061, China | | LU Xiaoyu | Department of Resources and Environmental Sciences, Shihezi University, Shihezi, Xinjiang 832061, China | | TAO Yifan | Department of Resources and Environmental Sciences, Shihezi University, Shihezi, Xinjiang 832061, China | | GUO Huijuan | Department of Resources and Environmental Sciences, Shihezi University, Shihezi, Xinjiang 832061, China | | HOU Zhenan | Department of Resources and Environmental Sciences, Shihezi University, Shihezi, Xinjiang 832061, China | | MIN Wei | Department of Resources and Environmental Sciences, Shihezi University, Shihezi, Xinjiang 832061, China |
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| Abstract: |
| To examine the effects of saline alkali stress on nutrient uptake and transport of cotton and to provide reference for promoting cotton growth in saline alkali land through nutrient regulation, Luyanmian 24 was selected as the research object to analyze the effects of saline stress (CS, NaCl, salt content: 4.43 g·kg-1) and alkaline stress (AS, Na2CO3 + NaHCO3 mass ratio 1∶1, salt content: 2.03 g·kg-1) on cotton growth, physiology and nutrient uptake. The results showed that saline and alkaline stress significantly inhibited the growth of cotton. Compared with CK treatment, the K/Na value and total biomass of leaves, stems, and roots in CS treatment decreased by 86.4%, 9.2%, 75.0%, and 57.5% respectively, and the contents of REC, MDA, SOD activity, POD activity, CAT activity, and PRO of leaves in CS treatment increased by 74.2%, 211.7%, 118.9%, 9.0%, 134.0%, and 230.0% respectively. The K/Na ratio and total biomass of leaves, stems, and roots decreased by 94.4%, 91.7%, 84.5%, and 58.8%. The contents of REC, MDA, SOD activity, POD activity, CAT activity, and PRO of leaves in AS treatment increased by 31.5%, 208.3%, 215.3%, 12.4%, 276.1%, and 264.2% respectively. In CS treated leaves: Na content increased by 563.0%, N content increased by 13.9%, P content decreased by 35.5%, K content decreased by 10.0%, Ca content decreased by 21.4%, Mg content decreased by 19.2%, S content decreased by 14.3%, Fe content increased by 26.2%, Mn content increased by 37.2%, Zn content increased by 32.2%, Cu content decreased by 11.1%, B content increased by 5.7%, Mo content increased by 21.1% and Ni content decreased by 5.1%. In AS treated leaves: Na content increased by 1 761.0%, N content decreased by 2.7%, P content decreased by 23.3%, K content increased by 5.9%, Ca content decreased by 40.0%, Mg content decreased by 27.3%, S content decreased by 17.5%, Fe content increased by 71.8%, Mn content increased by 81.8%, Zn content increased by 19.7%, Cu content increased by 10.3%, B content decreased by 20.3%, Mo content increased by 133.7% and Ni content increased by 66.8%. Cotton adapted to saline and alkali stress by strengthening antioxidant enzyme system and accumulating proline. Foliar spraying of N, P, K, Ca, Mg, S, B, Fe, Cu and Ni under salt stress and foliar spraying of N, P, Ca, Mg, S, Fe, Zn and B under alkali stress could alleviate the adverse effects of salt and alkali stress on nutrient absorption. |
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