| 戴 军1，刘 奎 2，杨 梅 2.不同保水剂对大花序桉幼苗生长及抗性生理的影响[J].广东农业科学,2020,47(4):54-60 |
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不同保水剂对大花序桉幼苗生长及抗性生理的影响 |
| 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 |
| 中文关键词: 大花序桉 生长 渗透调节 抗氧化物质 保水剂 |
| 英文关键词: Eucalyptus cloeziana growth osmotic regulation antioxidant substances water retaining agent |
| 基金项目:广西创新驱动发展专项（桂科 AA17204087-6） |
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| 中文摘要: |
| 【目的】为了提高大花序桉的耐旱性，探讨了不同保水剂对大花序桉幼苗生长及抗性生理的影响，以期为大花序桉人工林的栽培管理提供数据参考。【方法】采用盆栽试验，研究 3 种保水剂即聚丙烯酰胺 - 丙烯酸 - 丙烯酸钠共聚物保水剂（B1）、丙烯酰胺 - 丙烯酸钾共聚物保水剂（B2）、微生物型保水剂（B3）的抗旱节水能力以及对大花序桉幼苗生长生理的影响。【结果】干旱处理 24 d 后，B3 处理的盆栽土壤含水率为16%，而 B1、B2 以及 CK 的盆栽土壤含水率仅有 6%、7% 和 6%。干旱处理 30 d 后，B3 处理的土壤含水率仍比B1、B2、CK 高出 5%；B3 处理下的大花序桉幼苗地径比 CK 高 64.7%，苗高生长量由大到小依次为 B3 ＞ B1 ＞B2 ＞ CK，B3 处理的苗高生长量分别比 B1、B2、CK 提高 5.7%、15.9% 和 64.7%；与其他处理相比，B3 处理大花序桉叶片的脯氨酸含量与过氧化氢酶活性最高，丙二醛含量最低，但可溶性糖含量在各处理间没有显著差异。【结论】保水剂主要通过调控渗透物质和抗氧化酶活性等方式提高大花序桉幼苗的耐旱能力，且保水剂中添加了活性细菌后能有效降低干旱胁迫对大花序桉的危害，因此微生物型保水剂（B3）可作为大花序桉应对季节性干旱的较佳选择。 |
| 英文摘要: |
| 【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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