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首页> 外文期刊>International Journal of Molecular Sciences >The Alleviation of Photosynthetic Damage in Tomato under Drought and Cold Stress by High CO 2 and Melatonin
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The Alleviation of Photosynthetic Damage in Tomato under Drought and Cold Stress by High CO 2 and Melatonin

机译：高氧化碳和褪黑素下干旱和冷应力下番茄光合损伤的减轻

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摘要

The atmospheric CO 2 concentration (a[CO 2 ]) is increasing at an unprecedented pace. Exogenous melatonin plays positive roles in the response of plants to abiotic stresses, including drought and cold. The effect of elevated CO 2 concentration (e[CO 2 ]) accompanied by exogenous melatonin on plants under drought and cold stresses remains unknown. Here, tomato plants were grown under a[CO 2 ] and e[CO 2 ], with half of the plants pre-treated with melatonin. The plants were subsequently treated with drought stress followed by cold stress. The results showed that a decreased net photosynthetic rate (P N ) was aggravated by a prolonged water deficit. The P N was partially restored after recovery from drought but stayed low under a successive cold stress. Starch content was downregulated by drought but upregulated by cold. The e[CO 2 ] enhanced P N of the plants under non-stressed conditions, and moderate drought and recovery but not severe drought. Stomatal conductance (g s ) and the transpiration rate (E) was less inhibited by drought under e[CO 2 ] than under a[CO 2 ]. Tomato grown under e[CO 2 ] had better leaf cooling than under a[CO 2 ] when subjected to drought. Moreover, melatonin enhanced P N during recovery from drought and cold stress, and enhanced biomass accumulation in tomato under e[CO 2 ]. The chlorophyll a content in plants treated with melatonin was higher than in non-treated plants under e[CO 2 ] during cold stress. Our findings will improve the knowledge on plant responses to abiotic stresses in a future [CO 2 ]-rich environment accompanied by exogenous melatonin.
机译：大气CO 2浓度（A [CO 2]）以前所未有的速度增加。外源褪黑激素在植物对非生物胁迫的反应中发挥阳性作用，包括干旱和冷。在干旱和冷应力下伴有外源褪黑素的升高的CO 2浓度（E [CO 2]）的效果仍然未知。在这里，番茄植物在[CO 2]和E [CO 2]下生长，用褪黑素预处理的一半植物。随后用干旱胁迫处理植物，然后冷应激。结果表明，通过延长的水赤字加剧了净光合速率（p n）的减少。在从干旱恢复后部分恢复P n，但在连续的冷应力下保持低。淀粉含量通过干旱下调，但通过寒冷上调。 E [CO 2]在非压力条件下增强植物的P n，适度的干旱和恢复但不严重干旱。在E [CO 2]下的干旱下，气孔导率（G S）和蒸腾速率（e）抑制较小，而不是在[CO 2]下。在E [CO 2]下生长的番茄在受到干旱时具有比[CO 2]下的更好的叶片冷却。另外，在恢复干旱和冷应激期间褪黑激素增强P n，在E [CO 2]下番茄中的增强生物质积累。在冷应激期间，用褪黑激素处理的叶片植物中的叶绿素含量高于E [CO 2]下的未处理植物。我们的研究结果将在未来的未来对非生物胁迫的植物反应的知识[CO 2] - 伴有外源褪黑激素的环境。

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