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- Title
甜菜碱对高温胁迫下茄子幼苗生理特性的影响.
- Authors
高晓萍; 张婧; 牛天航; 刘阳; 常有麟; 刘思恬; 颉建明
- Abstract
To investigate the mitigating effect of exogenous glycine betaine on the injury of eggplant under high temperature stress, eggplant variety ‘Bride’ was used as the test material. Seedlings were foliar sprayed with 0 (CK), 20 (T1), 40 (T2) and 60 mmol·L-1 (T3) glycine betaine at four leaves and one heart stage for 3 d. The changes in biomass accumulation, photosynthetic characteristics, Calvin cycle key enzymes activity and antioxidant enzymes activity were measured in a climatic chamber at 40 ℃ after high temperature stress for 48 h. The results showed that the growth of eggplant seedlings under high temperature stress could be alleviated to different degrees by spraying different concentrations of glycine betaine, with the most obvious effect of 40 mmol·L-1 treatment. Compared with CK, the height, fresh weight, root length, root surface area, root volume and root tip number of T2 treated seedlings were significantly (P<0.05) increased by 32.97%, 34.17%, 19.47%, 16.55%, 32.20% and 25.29%, respectively; T2 treatment significantly increased chlorophyll a, chlorophyll b and total chlorophyll content; meanwhile, it significantly increased leaf photosynthetic parameters net photosynthesis rate (Pn), stomatal conductance (Gs) and transpiration rate (Tr) by 51.26%, 40.24% and 49.86%, respectively, and significantly increased the activities of Calvin cycle related enzymes activity such as fructose 1,6 diphosphatase (FBPase), fructose 1,6-bisphosphate aldolase (FBA), 3-phosphoglyceraldehyde dehydrogenase (GAPDH) and transketolase (TK), and the actual photochemical efficiency of photosystem Ⅱ. T2 treatment significantly increased leaf superoxide dismutase (SOD) activity, peroxidase (POD) activity, catalase (CAT) activity and proline (Pro) content by 35.62%, 109.65%, 72.99% and 58.13%, respectively. Glycine betaine at 40 mmol·L-1 reduced the degradation of chlorophyll accumulation, maintained photosynthetic carbon cycle enzyme activity, promoted photosynthesis, improved leaf antioxidant enzymes activity, and reduced cell membrane injury, thus promoting the growth of eggplant seedlings under high temperature stress
- Publication
Acta Agriculturae Zhejiangensis, 2023, Vol 35, Issue 9, p2097
- ISSN
1004-1524
- Publication type
Article
- DOI
10.3969/j.issn.1004-1524.20221258