| Effects of zeaxanthin on photosynthesis capacity and xanthophyll cycle of pepper under low temperature and weak light |
|
View Fulltext View/Add Comment Download reader |
| |
| DOI：10.7606/j.issn.1000-7601.2024.02.20 |
| Key Words: pepper exogenous zeaxanthin low temperature and weak light stress photosynthetic capacity xanthophyll cycle |
| Author Name | Affiliation | | PU Kaiguo | College of Horticulture, Gansu Agriculture University, Lanzhou, Gansu 730070, China | | DING Dongxia | College of Horticulture, Gansu Agriculture University, Lanzhou, Gansu 730070, China | | LI Nenghui | College of Horticulture, Gansu Agriculture University, Lanzhou, Gansu 730070, China | | ZHANG Miao | College of Horticulture, Gansu Agriculture University, Lanzhou, Gansu 730070, China | | WANG Tiantian | College of Horticulture, Gansu Agriculture University, Lanzhou, Gansu 730070, China | | XIE Jianming | College of Horticulture, Gansu Agriculture University, Lanzhou, Gansu 730070, China | | LI Jing | College of Horticulture, Gansu Agriculture University, Lanzhou, Gansu 730070, China |
|
| Hits: 774 |
| Download times: 588 |
| Abstract: |
| To further explore the effects of zeaxanthin on weak temperature and weak light tolerance of hot pepper, the effects of zeaxanthin on the activities of key photosynthetic enzymes, chlorophyll fluorescence parameters, endogenous hormone content, xanthophyll cycle and related gene expression in pepper ‘Hangjiao 2’under low temperature and weak light stress (15℃/5℃, 100 μmol·m-2·s-1) were studied, and the physiological mechanism of zeaxanthin in alleviating low temperature and weak light stress of pepper seedlings were explored. The results showed that spraying zeaxanthin significantly increased the photosynthetic capacity of pepper seedlings under low temperature and weak light, and the maximum photochemical quantum yield (Fv/Fm) and actual photochemical quantum yield Y (Ⅱ) were significantly increased by 5.90% and 54.33%, respectively. The contents of jasmonic acid (JA) and auxin (IAA) increased significantly by 16.70% and 62.30%. The contents of antheraxanthin, violaxanthin, xanthophyll and zeaxanthin in pepper seedlings increased by 1.06, 0.48, 0.19 times and 1.57 times, respectively. At the same time, the expression of CaZEP gene increased significantly by 3.44, 1.64 times and 5.50 times at 24, 48, 168 h, but there was no significant difference in CaVDE gene expression. To sum up, spraying zeaxanthin might enhance the tolerance of pepper seedlings to low temperature and low light stress by enhancing the photosynthetic capacity of pepper seedlings, regulating hormone metabolism, and promoting the initiation of xanthophyll cycle in pepper seedlings. |
|
|
|