| 滕元旭,骆霞,张雪蒙,崔辉梅.外源CO对盐胁迫下加工番茄幼苗光合荧光的影响[J].干旱地区农业研究,2023,(1):86~93 |
| 外源CO对盐胁迫下加工番茄幼苗光合荧光的影响 |
| 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 |
| 中文关键词: 加工番茄 外源CO 盐胁迫 光合作用 叶绿素荧光 |
| 英文关键词:processed tomato exogenous CO salt stress photosynthesis chlorophyll fluorescence |
| 基金项目:国家自然科学基金（31860551） |
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| 中文摘要: |
| 以加工番茄品系KT-7为试验材料，研究了不同浓度(0.010、0.025 mmol·L-1)外源CO对盐胁迫（150 mmol·L-1）下加工番茄的光合参数、快速荧光动力学曲线、渗透调节物质等生理特性的影响。结果表明，盐胁迫抑制了加工番茄的光合和生长，导致光合同化效率降低和PSⅡ反应中心活性下降，净光合速率Pn、干物质积累量分别降低了72.11%、35.04%。叶片喷施CO供体可不同程度地改变OJIP曲线形状，增加光合色素含量，提高光合同化效率，调控渗透性调节物质含量，降低盐胁迫对细胞膜结构的伤害；其中以Na150H1效果最佳，叶绿素a、叶绿素b含量与盐胁迫处理相比分别提高了10.58%、19.52%，净光合速率、表观CO2利用效率与盐胁迫相比分别提高了87.24%和152.58%，脯氨酸和可溶性糖含量与盐胁迫相比分别降低了40.16%、25.18%。综上所述，适宜浓度的外源CO提高了叶片的光合能力，激活自我保护机制，降低过量的活化电子对细胞光合膜结构的破坏，缓解盐胁迫对加工番茄叶片光合作用的限制，提高了植物抗盐性。 |
| 英文摘要: |
| 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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