Divergent Photosynthetic Strategies of Lupinus polyphyllus and Helleborus viridis During Cold Acclimation and Freezing-Thaw Recovery
文献类型： 外文期刊
作者： Xie, Pengyuan 1 ; Zhao, Yining 1 ; Zhao, Xin 1 ; Xu, Linbo 3 ; Wang, Kai 3 ; Jia, Ruidong 1 ; Kou, Yaping 1 ; Ge, Hong 1 ; Wang, Wenjun 2 ; Yang, Shuhua 1 ;
作者机构： 1.Chinese Acad Agr Sci, Inst Vegetables & Flowers, State Key Lab Vegetable Biobreeding,Minist Agr & R, Key Lab Biol & Genet Improvement Flower Crops Nort, Beijing 100081, Peoples R China
2.Heilongjiang Acad Agr Sci, Inst Ind Crops, Harbin 150086, Peoples R China
3.Chinese Acad Agr Sci, Inst Grassland Res, Northern Agr & Livestock Husb Technol Innovat Ctr, Hohhot 010010, Peoples R China
关键词： photosynthesis; photoinhibition; antioxidant system; cold tolerance
期刊名称：PLANTS-BASEL （ 影响因子：4.1； 五年影响因子：4.5 ）
ISSN： 2223-7747
年卷期： 2025 年 14 卷 4 期
页码：
收录情况： SCI
摘要： Low temperatures can significantly affect the growth of ornamental plants, emphasizing the importance of improving their cold tolerance. However, comparative studies on the photosynthetic responses of sun and shade plants to low temperatures remain limited. In this study, gas exchange, chlorophyll fluorescence in Photosystem II (PSII) and Photosystem I (PSI), the antioxidant system, the osmoregulator substance, and lipid peroxidation were investigated in the shade plant Helleborus viridis (Hv) and the sun plant Lupinus polyphyllus (Lp) during cold acclimation (CA) and the freezing-thaw recovery (FTR). The CA treatment significantly declined the net photosynthetic rate (Pn) and the maximum photochemical efficiency of PSII (Fv/Fm) in Hv and Lp, indicating the photoinhibition occurred in both species. However, Hv exhibited a much better photosynthetic stability to maintain Pn, Fv/Fm, and carboxylation efficiency (CE) than Lp during CA, suggesting that Hv had a greater photosynthetic resilience compared to Lp. Furthermore, Hv preferred to maintain Pn, Fv/Fm, the actual photosynthetic efficiency of PSII (Y(II)), and the actual photosynthetic efficiency of PSI (Y(I)) to consistently provide the necessary energy for the carbon assimilation process, while Lp tended to divert and dissipate excess energy by thermal dissipation and cyclic electron flow during CA. Moreover, there were higher soluble sugar contents in Hv in comparison to Lp. These traits allowed Hv to recover photosynthetic efficiency and maintain cellular integrity better than Lp after the freezing stress. In conclusion, CA significantly reduced the photosynthetic capacity and led to the divergent photosynthetic strategies of both species, which finally resulted in a different freezing tolerance after the freezing-thaw recovery. These findings provide insights into the divergent photoprotective strategies of sun and shade plants in response to cold temperatures.
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