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| Effects of Different Water Retaining Agents on the Growth and Resistance Physiology of Eucalyptus cloeziana Seedlings |
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| DOI：10.16768/j.issn.1004-874X.2020.04.008 |
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| Abstract: |
| 【Objective】In order to improve the drought resistance of Eucalyptus cloeziana, the effects of different water retaining agents on the growth and resistance physiology of E. cloeziana seedlings were studied in order to provide data references for the cultivation and management of artificial plantation of E. cloeziana.【Method】Pot experiments were carried out to study the drought resistance and water saving capacity of three water retaining agents and their effects on the growth and physiology of E. cloeziana seedlings. The three water retaining agents were polyacrylamide - acrylic acid - sodium acrylate copolymer water holding agent（B1）, acrylamide potassium acrylate copolymer water holding agent（B2）and microbial water holding agent（B3）.【Result】After 24 days of drought treatment, the soil moisture content of B3 was 16%, while that of B1, B2 and CK was only 6%, 7% and 6%, respectively. After 30 days of drought treatment, the soil moisture content of B3 treatment was still 5% higher than that of B1, B2 and CK. The ground diameter of B3 treatment was 64.7% higher than that of CK, and the height growth of B3 treatment was 5.7%, 15.9% and 64.7% higher than that of B1, B2 and CK, respectively. Compared with other treatments, the proline content and catalase（CAT）activity of leaves under B3 treatment were the highest, while the malondialdehyde（MDA）content in leaves under B3 treatment was the lowest, but there was no significant difference in soluble sugar content among various treatments.【Conclusion】Water retaining agent can improve the drought resistance of E. cloeziana seedlings by mainly regulating the osmotic substances and antioxidant enzyme activities, and effectively reduce the harm of drought stress to E. cloeziana by adding active bacteria in the water retaining agent. Therefore, the microbial water retaining agent（B3）can be a better choice for E. cloeziana to deal with seasonal drought. |
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