| Effects of water and salt stress on photosynthetic and fluorescence parameters of different cotton varieties at seedling stage |
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| DOI：10.7606/j.issn.1000-7601.2024.05.16 |
| Key Words: water and salt stress cotton photosynthesis chlorophyll fluorescence seedling stage |
| Author Name | Affiliation | | ZHONG Zhibo | Institute of Farmland Water Conservancy and Soil\|fertilizer, Xinjiang Academy of Agricultural Reclamation Sciences，Shihezi, Xinjiang 832000, China
Key Laboratory of Northwest Oasis Water\|Saving Agriculture, Ministry of Agriculture and Rural Affairs, P.R. China, Shihezi, Xinjiang 832000, China | | WANG Shuhong | XPCC Surveying ＆ Designing Institute Group Co., Ltd., Shihezi, Xinjiang 832000, China | | HE Shuai | Institute of Farmland Water Conservancy and Soil\|fertilizer, Xinjiang Academy of Agricultural Reclamation Sciences，Shihezi, Xinjiang 832000, China
Key Laboratory of Northwest Oasis Water\|Saving Agriculture, Ministry of Agriculture and Rural Affairs, P.R. China, Shihezi, Xinjiang 832000, China | | LI Yunxia | Institute of Farmland Water Conservancy and Soil\|fertilizer, Xinjiang Academy of Agricultural Reclamation Sciences，Shihezi, Xinjiang 832000, China
Key Laboratory of Northwest Oasis Water\|Saving Agriculture, Ministry of Agriculture and Rural Affairs, P.R. China, Shihezi, Xinjiang 832000, China | | SHI Cong | College of Agriculture, Shihezi Univerity, Shihezi, Xinjiang 832000, China | | ZHANG Zheng | College of Agriculture, Tarim University, Alaer, Xinjiang 843300, China |
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| Abstract: |
| Using the main cotton varieties ‘Tahe 2,’ ‘Xinluzhong 56,’ and ‘Xinluzhong 87’ from the Xiaohaizi irrigation area in Xinjiang, this study set water amounts as the standard for irrigation (W1: upper limit 60%, lower limit 50%; W2: upper limit 70%, lower limit 60%; W3: upper limit 80%, lower limit 70%). The SPAD values, photosynthetic rates, and fluorescence parameters were analyzed under varying levels of soil salinity stress (S1: 3 g·kg-1, S2: 4.5 g·kg-1, S3: 6 g·kg-1) and different irrigation thresholds. The results showed that the maximum value of 0~30 cm soil salt return was 27.44% for S1 treatment, 68.44% for S2 and 64.39% for S3 treatment. In addition to the maximum yield of electron transfer at the cotton seedling stage, all the correlations between photosynthesis and chlorophyll fluorescence parameters showed significant differences (P<0.01). However, soil salinity mainly produced significant effects on Gs, Tr and ΦPSII, qP, Y(N0), α, ETRmax, and IK. The lower limit of irrigation only had significant effects on ΦPSII and Y(N0). The Gs of ‘Tahe 2’ cotton were significantly greater by 92.1% in W3S1 treatment than that of W3S2 treatment, and the Pn and Gs of ‘Xinluzhong 56’ were significantly lower than W1S1 treatment by 19.2%~68.2% under S1 and S3 treatments. W3 irrigation treatment in cotton ‘Xinluzhong 87’ and Tr increased by 39.4%~53.1% and 10.6%~20.8% compared with other irrigation treatments. Therefore, ‘Tahe 2’ cotton was more sensitive to salt treatment. The moisture content of ‘Xinluzhong 56’ cotton in the soil of 50%θ (field water capacity) fields significantly reduced the improvement of photosynthetic parameters. ‘Xinluzhong 87’ cotton was more conducive to growth under W3 irrigation treatment. |
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