| Alleviating effect of different concentrations of exogenous zeaxanthin on pepper seedlings under low temperature and weak light stress |
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| DOI：10.7606/j.issn.1000-7601.2022.03.07 |
| Key Words: zeaxanthin, pepper seedling, low temperature and weak light, photosynthetic parameters, oxidative stress |
| Author Name | Affiliation | | DING Dongxia | College of Horticulture, Gansu Agricultural University, Lanzhou, Gansu 730070, China | | LI Jing | College of Horticulture, Gansu Agricultural University, Lanzhou, Gansu 730070, China | | XIE Jianming | College of Horticulture, Gansu Agricultural University, Lanzhou, Gansu 730070, China | | LI Nenghui | College of Horticulture, Gansu Agricultural University, Lanzhou, Gansu 730070, China | | HAN Kangning | College of Horticulture, Gansu Agricultural University, Lanzhou, Gansu 730070, China | | ZHANG Jing | College of Horticulture, Gansu Agricultural University, Lanzhou, Gansu 730070, China | | NIU Tianhang | College of Horticulture, Gansu Agricultural University, Lanzhou, Gansu 730070, China | | YANG Yan | College of Horticulture, Gansu Agricultural University, Lanzhou, Gansu 730070, China |
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| Abstract: |
| To solve the problem of low temperature and weak light stress during the facility pepper production in northwest China in winter and spring, the study took the low temperature sensitive pepper variety ‘Hangjiao No. 2’ as the test material to study the alleviating effect of exogenous zeaxanthin in different concentrations on pepper seedlings under low temperature and weak light stress. Pepper seedlings were pretreated with zeaxanthin solution of 0 (CK), 20 (T1), 50 (T2) and 100 (T3) mg·L-1 for 4 consecutive days, and then placed in an artificial climate chamber to simulate low temperature and weak light stress for 7 days. The physiological indexes related to growth, photosynthesis and antioxidant enzymes of pepper seedlings were measured. It was found that pretreatment with different concentrations of exogenous zeaxanthin significantly alleviated the stress of pepper seedlings under low temperature and light stress, and the T2 treatment had the best effect. Compared with CK, the plant height and stem diameter of the T2 treatment increased by 5.52% and 17.09%, respectively. The photosynthetic pigment content, net photosynthetic rate (Pn), stomatal conductance (Gs) and transpiration rate (Tr) of leaves were significantly increased. The soluble sugar and soluble protein of osmotic regulation substance increased by 22.35% and 19.58%, respectively. Antioxidant enzymes SOD and CAT increased by 19.23% and 381.55%, respectively. In addition, the T2 treatment significantly reduced the content of superoxide anion, malondialdehyde (MDA) and relative conductivity. The result showed that exogenous zeaxanthin (50 mg·L-1) effectively alleviated the oxidative damage caused by low temperature and weak light pepper seedlings, protected the integrity of the cell membrane, reduced the damage to photosynthetic organs of seedlings, strengthened the stomatal conductance and photosynthetic capacity of leaves, and improved the tolerance at low temperature and weak light stress. |
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