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- Title
不同抗旱性狗牙根种质的抗旱生理响应差异分析.
- Authors
张一龙; 孙晓梵; 李硕; 李培英; 孙宗玖
- Abstract
In order to reveal the physiological mechanism of Cynodon dactylon drought resistance, screen the key indicators affected drought resistance under different drought stresses, and explore the different response of different drought-resistant Cynodon dactylon to drought stress, 2 types of different drought-resistant Cynodon dactylon were used as experimental materials. The changing laws of leaf relative water content, relative electrical conductivity, photosynthetic pigment content, antioxidant enzyme activity and osmotic adjustment substance content under gradual slow drought stress were analyzed. The results showed that, with the decrease of soil water content and the intensification of drought stress, the relative water content of the tested Cynodon dactylon leaves continued to decrease, while the relative electrical conductivity and the contents of malondialdehyde, soluble proteinand proline showed an increasing trend. The pigment content and the activities of 3 antioxidant enzymes showed a trend of first increasing and then decreasing. Compared with drought-sensitive materials, the drought-resistant Cynodon dactylon maintained higher activities of antioxidant enzymes under moderate to severe drought stress, and accumulated more proline and soluble protein contents, which lead to a slow increase of electrical conductivity and malondialdehyde. It showed that the different germplasm with same drought-resistant had different response mechanism to drought. C118 showed high chlorophyll content, while C138 showed high carotenoid content. Grey correlation analysis indicated that, under moderate drought (14 d), relative conductivity, carotenoids content and superoxide dismutase activity had greater impact on the drought resistance of Cynodon dactylon; while under severe drought (20 d), the contents of proline and soluble protein showed high correlation with resistant to drought. The above results clarified the physiological response mechanism of different drought-resistant Cynodon dactylon to drought, which laid the foundation for the selection of drought-tolerant grass species and water-saving technology.
- Subjects
BERMUDA grass; SOIL moisture; PHOTOSYNTHETIC pigments; ELECTRIC conductivity; SUPEROXIDE dismutase; PHYSIOLOGY; CAROTENOIDS; ABSCISIC acid
- Publication
Journal of Agricultural Science & Technology (1008-0864), 2023, Vol 25, Issue 6, p59
- ISSN
1008-0864
- Publication type
Article
- DOI
10.13304/j.nykjdb.2021.0986