a-Tocopherol in chloroplasts: Nothing more than an antioxidant?

被引:21
作者
Mesa, Tania [1 ]
Munne-Bosch, Sergi [1 ,2 ]
机构
[1] Univ Barcelona, Fac Biol, Dept Evolutionary Biol Ecol & Environm Sci, Av Diagonal 643, E-08028 Barcelona, Spain
[2] Univ Barcelona, Res Inst Nutr & Food Safety, Fac Biol, Av Diagonal 643, E-08028 Barcelona, Spain
关键词
Tocopherols; Non-antioxidant functions; Redox state; Plastid retrograde; signaling; Redox signaling; VITAMIN-E; ALPHA-TOCOPHEROL; GAMMA-TOCOPHEROL; LIPID-PEROXIDATION; ABIOTIC STRESS; OXIDATIVE STRESS; GENE-EXPRESSION; SEED LONGEVITY; SUCROSE EXPORT; PHYTOL-KINASE;
D O I
10.1016/j.pbi.2023.102400
中图分类号
Q94 [植物学];
学科分类号
071001 ;
摘要
Among the eight forms of vitamin E, only tocopherols are essential compounds that are distributed throughout the entire plant kingdom, with a-tocopherol being the most predominant form in photosynthetic tissues. At the cellular level, a-tocopherol is of special relevance inside the chloroplast, where it eliminates singlet oxygen and modulates lipid peroxidation. This is of utmost relevance since tocopherols are the only antioxidants that counteract lipid peroxidation. Moreover, at the whole-plant level, a-tocopherol appears to modulate several physiological processes from germination to senescence. The antioxidant role of a-tocopherol at the cellular level can have profound effects at the whole-plant level, including the modulation of physiological processes that are apparently not related to redox processes and could be considered nonantioxidant functions. Here, we discuss whether nonantioxidant functions of a-tocopherol at the whole-plant level are mediated by its antioxidant role in chloroplasts and the regulation of redox processes at the cellular level.
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页数:11
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