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Effects of sulfate on the photosynthetic physiology characteristics of Hydrocotyle vulgaris under zinc stress

文献类型： 外文期刊

作者： He, Xiaoyan 1 ; Liu, Shiling 1 ; Huang, Xiaoqian 1 ; Yu, Fangming 1 ; Li, Yi 1 ; Li, Furong 2 ; Liu, Kehui 1 ;

作者机构： 1.Guangxi Normal Univ, Key Lab Ecol Rare & Endangered Species & Environm, Minist Educ, Guilin 541004, Peoples R China

2.Guangdong Acad Agr Sci, Inst Qual Stand, Monitoring Technol Agroprod, Guangzhou, Peoples R China

关键词： chlorophyll fluorescence; gas exchange parameters; H. vulgaris; hydroponic culture; photosynthetic pigments; pollution remediation; sulfate; zinc stress

期刊名称：FUNCTIONAL PLANT BIOLOGY （ 影响因子：3.0； 五年影响因子：3.1 ）

ISSN： 1445-4408

年卷期： 2023 年

页码：

收录情况： SCI

摘要： The effects of sulfate on the zinc (Zn) bioaccumulation characteristics and photophysiological mechanisms of the ornamental plant Hydrocotyle vulgaris were explored using a hydroponic culture under three Zn concentrations (300, 500 and 700 mg L-1) with (400 mu mol L-1) or without the addition of sulfate. Results showed that: (1) tissue Zn concentrations and total Zn contents increased with increasing hydroponic culture Zn concentrations; and sulfate addition decreased Zn uptake and translocation from roots to shoots; (2) Zn exposure decreased photosynthetic pigment synthesis, while sulfate changed this phenomenon, especially for chlorophyll a under 300 mg L-1 Zn treatment; (3) Zn exposure decreased photosynthetic function, while sulfate had positive effects, especially on the photosynthetic rate (Pn) and stomatal conductance (Gs); and (4) chlorophyll fluorescence parameters related to light energy capture, transfer and assimilation were generally downregulated under Zn stress, while sulfate had a positive effect on these processes. Furthermore, compared to photosynthetic pigment synthesis and photosynthesis, chlorophyll fluorescence was more responsive, especially under 300 mg L-1 Zn treatment with sulfate addition. In general, Zn stress affected photophysiological processes at different levels, while sulfate decreased Zn uptake, translocation, and bioaccumulation and showed a positive function in alleviating Zn stress, ultimately resulting in plant growth promotion. All of these results provide a theoretical reference for combining H. vulgaris with sulfate application in the bioremediation of Zn-contaminated environments at the photophysiological level.

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