Hydrogen sulfide improves tall fescue photosynthesis response to low-light stress by regulating chlorophyll and carotenoid metabolisms

被引：26
|
作者：
Liu, Bowen [1 ]
Zhang, Xuhu [1 ]
You, Xiangkai [1 ]
Li, Youyue [1 ]
Long, Si [1 ]
Wen, Suyun [1 ]
Liu, Qian [1 ]
Liu, Tieyuan [1 ]
Guo, Huan [1 ]
Xu, Yuefei [1 ]
机构：
[1] Northwest A&F Univ, Coll Grassland Agr, Yangling, Yangling 712100, Shaanxi, Peoples R China
来源：
PLANT PHYSIOLOGY AND BIOCHEMISTRY | 2022年 / 170卷
基金：
中国国家自然科学基金;
关键词：
Carotenoids; Chlorophyll; Hydrogen sulfide; Low light; Photosynthesis; Tall fescue; SALT TOLERANCE; BETA-CAROTENE; EXPRESSION; GENE; BIOSYNTHESIS; ACCUMULATION; ARABIDOPSIS; HOMEOSTASIS; SEEDLINGS; LUTEIN;
D O I：
10.1016/j.plaphy.2021.12.002
中图分类号：
Q94 [植物学];
学科分类号：
071001 ;
摘要：
Hydrogen sulfide (H2S), as a gaseous messenger molecule, plays critical roles in signal transduction and biological modulation. In the present study, the roles of H2S in regulating chlorophyll (Chl) and carotenoid (Car) contents to improve photosynthesis in tall fescue were investigated under low-light (LL) stress. Compared to control conditions, LL stress significantly reduced total biomass, net photosynthetic rate (Pn), maximal quantum yield of photosystem II (PSII) photochemistry (Fv/Fm), and the contents of Chl and Car. Under exogenous sodium hydrosulfide (NaHS, H2S donor) application, these parameters were enhanced, ultimately increasing photosynthesis. Moreover, exogenous H2S up-regulated the expression of chlorophyll biosynthesis genes while down regulated chlorophyll degradation genes, resulting in increases in chlorophyll precursors. Components of carotenoids and expression of genes encoding biosynthesis and degradation enzymes varied similarly. Additionally, application exogenous H2S up-regulated expression of FaDES1 and FaDCD. Thus, it enhanced L-cysteine desulfhydrase 1 (DES1, EC 4.4.1.1) and D-cysteine desulfhydrase (DCD, EC 4.4.1.15) activities leading to elevated endogenous H2S. However, these responses were reversed by treatment with hypotaurine (HT, H2S scavenger). These results suggested that H2S is involved in regulating photosynthesis to improve LL tolerance via modulating Chl and Car metabolisms in tall fescue.
引用
收藏
页码：133 / 145
页数：13
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