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Changes in photosynthesis, chlorophyll fluorescence, and antioxidant enzymes of mulberry (Morus ssp.) in response to salinity and high-temperature stress

文献类型： 外文期刊

作者： Yu, Cui 1 ; Huang, Shujun 2 ; Hu, Xingming 1 ; Deng, Wen 1 ; Xiong, Chao 1 ; Ye, Chuhua 1 ; Li, Yong 1 ; Peng, Bo 1 ;

作者机构： 1.Hubei Acad Agr Sci, Ind Crops Inst, Wuhan 430064, Peoples R China

2.Wuhan Univ, Coll Life Sci, Wuhan 430072, Peoples R China

关键词： antioxidant enzymes;chlorophyll fluorescence;gas exchange;proline content;soluble sugar content;superoxide anion radical

期刊名称：BIOLOGIA （ 影响因子：1.35； 五年影响因子：1.139 ）

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收录情况： SCI

摘要： Photosynthesis, chlorophyll (Chl) fluorescence, and antioxidant enzymes were measured in the mulberry (Morus spp.) cultivars Da 10, Hongguo 2, Anza 1, and Taiwan 72C002, which were subjected to salinity and high-temperature stress (STS; 0. 1%, 0. 3%, and 0. 5% NaCl concentrations, 34. 5°C-40. 5°C/27. 8°C-29. 2°C day/night temperatures). Control plants were watered with 1 L of full-strength Hoagland's nutrient solution with no added NaCl. Net photosynthetic rate (P_N), stomatal conductance (g_s), and effective quantum yield of photosystem II photochemistry (Φ_(PSII)) increased in Anza 1 and Taiwan 72C002 under 0. 1% STS but decreased in Da 10 and Hongguo 2 compared with the control. However, all the above parameters, including Chl content, maximum quantum yield of photosystem II photochemistry (F_v/F_m), nonphotochemical quenching (NPQ), and maximum carboxylation velocity of Rubisco (V_(cmax), decreased in Taiwan 72C002, Honggua 2, and Da 10 under 0. 3% and 0. 5% STS, suggesting that photoinhibition occurred under severe STS. Under STS, there were no significant changes in P_N, F_v/F_m, Φ_(PSII), ascorbate peroxidase (APX) activity, superoxide dismutase (SOD) activity, catalase activity, superoxide anion radical (O_2 ~-) content, malondialdehyde (MDA) content, soluble sugar content (SSC), and leaf biomass in Anza 1 even at 0. 5% STS, showing that Anza 1 displays high resistance to STS. In addition, peroxidase activity was significantly higher in Anza 1 than in the other mulberry cultivars. Significant adverse effects of severe salinity on photosynthesis and Chl fluorescence parameters were observed in Da 10. Additionally, SOD, peroxidase, and APX activities were lower in Da 10, whereas O_2 ~- and MDA contents were higher in comparison with the other mulberry cultivars under 0. 3% and 0. 5% STS, suggesting that Da 10 had low resistance to STS. These results show that 0. 1% STS had a positive effect on photosynthesis and Chl fluorescence parameters in Anza 1 and Taiwan 72C002, and higher peroxidase activity can to a certain extent explain the higher STS tolerance in Anza 1. Damages to DSM photosystems might be related to lower SOD, POD, and APX activities, which resulted in the accumulation of reactive oxygen species.

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