| Effects of exogenous CO on photosynthesis and chlorophyll fluorescence characteristics of processed tomato seedlings under salt stress |
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| DOI：10.7606/j.issn.1000-7601.2023.01.11 |
| Key Words: processed tomato exogenous CO salt stress photosynthesis chlorophyll fluorescence |
| Author Name | Affiliation | | TENG Yuanxu | Agricultural College, Shihezi University, Shihezi, Xinjiang 832003, China
Xinjiang Production and Construction Corps Key Laboratory of Special Fruits and Vegetables Cultivation Physiology and Germplasm Resources Utilization, Shihezi, Xinjiang 832003, China | | LUO Xia | Agricultural College, Shihezi University, Shihezi, Xinjiang 832003, China
Xinjiang Production and Construction Corps Key Laboratory of Special Fruits and Vegetables Cultivation Physiology and Germplasm Resources Utilization, Shihezi, Xinjiang 832003, China | | ZHANG Xuemeng | Agricultural College, Shihezi University, Shihezi, Xinjiang 832003, China
Xinjiang Production and Construction Corps Key Laboratory of Special Fruits and Vegetables Cultivation Physiology and Germplasm Resources Utilization, Shihezi, Xinjiang 832003, China | | CUI Huimei | Agricultural College, Shihezi University, Shihezi, Xinjiang 832003, China
Xinjiang Production and Construction Corps Key Laboratory of Special Fruits and Vegetables Cultivation Physiology and Germplasm Resources Utilization, Shihezi, Xinjiang 832003, China |
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| Abstract: |
| Using the processed tomato line KT-7 as the test material, the photosynthetic parameters, fast fluorescence kinetics curve, osmotic properties of processed tomatoes under salt stress (150 mmol·L-1) with different concentrations of exogenous CO (0.010, 0.025 mmol·L-1) were studied. The effects of regulating substances and other physiological properties were also examined. The results showed that salt stress inhibited the photosynthesis and growth of processed tomatoes, resulting in reduction of photosynthesis efficiency and PSII reaction center activity, and the net photosynthetic rate Pn and dry matter accumulation decreased by 72.11% and 35.04%, respectively. Leaf spraying of CO donors changed the shape of OJIP curve to varying degrees, increased the content of photosynthetic pigments, improved the efficiency of photosynthesis, adjusted the content of osmotic regulators, and reduced the damage to cell membrane structure caused by salt stress. Among them, Na150H1 had the best effect, the contents of chlorophyll a and chlorophyll b were increased by 10.58% and 19.52% respectively compared with the salt treatment, and the net photosynthetic rate and apparent CO2 utilization efficiency were increased by 87.24% and 152.58% respectively compared with the salt stress. The content of proline and soluble sugar decreased by 40.16% and 25.18%, respectively, compared with salt stress. In summary, the appropriate concentration of exogenoous CO improved the photosynthetic capacity of leaves, activated the self\|protection mechanism, reduced the damage of excessive activated electrons to the structure of cell photosynthetic membranes, alleviated the limitation of salt stress on the photosynthesis of processed tomato leaves, and improved the plant salt resistance. |
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