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| Effects of biochar on cotton seedling root morphology and root exudates under moderate and severe saline stress |
| Received:January 15, 2024 |
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| KeyWord:biochar;salt stress;total root length;oxalic acid;soluble sugar |
| Author Name | Affiliation | E-mail | | LIU Danyang | College of Resources and Environment, Xinjiang Agricultural University, Urumqi 830052, China | | | WANG Bohao | College of Resources and Environment, Xinjiang Agricultural University, Urumqi 830052, China | | | LI Jun | College of Chemistry and Chemical Engineering, Xinjiang Agricultural University, Urumqi 830052, China | | | MAHEBALI Orazbek | College of Resources and Environment, Xinjiang Agricultural University, Urumqi 830052, China | | | ZHANG Hanshen | College of Resources and Environment, Xinjiang Agricultural University, Urumqi 830052, China | | | ZHU Xinping | College of Biological and Resource Environment, Beijing University of Agriculture, Beijing 102206, China | zhuxinping1978@163.com | | YANG Zaile | College of Resources and Environment, Xinjiang Agricultural University, Urumqi 830052, China
Xinjiang Key Laboratory of Soil and Plant Ecological Processes, Urumqi 830052, China | yzl@xjau.edu.cn | | JIA Hongtao | College of Resources and Environment, Xinjiang Agricultural University, Urumqi 830052, China
Xinjiang Key Laboratory of Soil and Plant Ecological Processes, Urumqi 830052, China
Key Laboratory of Saline-Alkali Land Improvement and Utilization(Saline-alkali Land in Arid and Semi-Arid Areas), Ministry of Agriculture and Rural Affairs, Urumqi 830091, China | | | XU Wanli | Institute of Soil Fertilizer and Agricultural Water Saving, Xinjiang Academy of Agricultural Sciences, Urumqi 830091, China
Key Laboratory of Saline-Alkali Land Improvement and Utilization(Saline-alkali Land in Arid and Semi-Arid Areas), Ministry of Agriculture and Rural Affairs, Urumqi 830091, China | |
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| Abstract: |
| To reveal the regulatory effect of biochar on cotton seedling root growth and root exudates under moderate to severe salt stress, pot experiments were conducted by adding concentrations of 0（control）, 0.5%, 1%, and 2% biochar and phosphoric acid-modified biochar to moderate and severe saline alkali soils, respectively, and the total root length, root surface area, root volume, and amounts of root exudates such as methane acid, acetic acid, and oxalic acid were measured during the seedling-stage of cotton. The results indicated that the increase in soil salinity significantly inhibited the total root length, root surface area, and root volume of cotton roots of the seedling stage. Under moderate and severe salt stress conditions, compared with the control, the total root length of cotton treated with 2% biochar and phosphoric acid-modified biochar significantly increased by 55.92% and 43.69%, respectively, and the root volume significantly increased by 41.73% and 55.88%, while the total root length of cotton treated with 0.5% biochar decreased by 25.31%. The use of unmodified biochar mainly increased the root methane acid content in cotton roots at seedling stage, while phosphoric acid-modified biochar significantly increased the content of oxalic acid, methane acid and citric acid in roots. Soluble total sugars showed a significant positive correlation with soil pH and soil total salt content. The content of methane acid in the cotton root was significantly negatively correlated with soil pH. The contents of oxalic acid, methane acid, and citric acid were significantly positively correlated with cotton root growth indicators（P<0.05）. It can be concluded from the results that the recommended application of 2% phosphoric acid-modified biochar in moderately or severely saline soil is better than unmodified biochar in improving cotton root growth and salt tolerance physiological characteristics. |
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