叶面喷施甜菜碱提高了苹果叶片光合作用对干旱胁迫的抗性
Spraying Glycinebetaine Enhances Photosynthesis against Drought Stress in Apple Plants
摘要: 本实验以一年生富士/平邑甜茶为实验材料，研究了叶面喷施甜菜碱对干旱胁迫条件下富士苹果叶片光合特性的影响，测定了叶片叶绿素含量、净光合速率、气孔导度、叶绿素a荧光参数及抗氧化系统等指标。结果表明，干旱胁迫下，叶面喷施甜菜碱预处理苹果叶片叶绿素含量明显高于对照，甜菜碱预处理提高了苹果叶片的气孔导度，同时还发现，叶面喷施甜茶碱能减轻活性氧的积累，提高抗氧化酶活性，维持PSII功能，甜菜碱预处理植株的光合特性与其对照植株的光合特性表现出显著差异(p < 0.05)，甜菜碱预处理植株具有更高的光合能力，对干旱胁迫表现出更好的抗性。这些抗性的提高与抗氧化酶活性的提高有关，与甜菜碱的保护功能有关。
Abstract: In this study, One-year-old “Fuji” apple trees were used to study the effects of spraying glycinebetaine (GB) on the photosynthetic characteristic of apple under drought stress. The chlorophyll contents of the apple leaves, net photosynthesis rate, stomatal conductance, chlorophyll a fluorescence parameters and antioxidant system etc. were measured. The results indicated that under drought stress, the chlorophyll content of apple leaves pretreated with GB was significantly higher than that of the control. GB pretreated improved the stomatal conductance of apple leaves, at the same time, it was also found that the application of GB on the leaves could reduce the accumulation of active oxygen, improve the activity of antioxidant enzymes and maintain the function of PSII. The photosynthetic characteristics of GB pretreated plants and those of the control plants showed were significant different (p < 0.05). GB pretreated plants had higher photosynthetic capacity and showed better resistance to drought stress. The increase of these resistances is related to the increase of antioxidant enzyme activity and the protective function of GB.
文章引用：王贵平, 王金政, 薛晓敏, 路超, 陈汝. 叶面喷施甜菜碱提高了苹果叶片光合作用对干旱胁迫的抗性[J]. 农业科学, 2020, 10(1): 50-58. https://doi.org/10.12677/HJAS.2020.101008

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