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Photorespiration is the major alternative electron sink under high light in alpine evergreen sclerophyllous Rhododendron species

文献类型： 外文期刊

作者： Huang, Wei 1 ; Yang, Ying-Jie 1 ; Wang, Ji-Hua 3 ; Hu, Hong 1 ;

作者机构： 1.Chinese Acad Sci, Kunming Inst Bot, Kunming 650201, Yunnan, Peoples R China

2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China

3.Yunnan Acad Agr Sci, Flower Res Inst, Kunming, Yunnan, Peoples R China

关键词： Alpine sclerophyllous species; Mesophyll conductance; Rhododendron; Photorespiration; Photoprotection; Photosynthesis

期刊名称：PLANT SCIENCE （ 影响因子：4.729； 五年影响因子：5.132 ）

ISSN： 0168-9452

年卷期： 2019 年 289 卷

页码：

收录情况： SCI

摘要： Owing to the high leaf mass per area, alpine evergreen sclerophyllous Rhododendron have low values of mesophyll conductance (g(m)). The resulting low chloroplast CO2 concentration aggravates photorespiration, which requires a higher ATP/NADPH ratio. However, the significance of photorespiration and underlying mechanisms of energy balance in these species are little known. In this study, eight alpine evergreen sclerophyllous Rhododendron species grown in a common garden were tested for their g(m), electron flow to photorespiration, and energy balancing. Under saturating light, g(m) was the most limiting factor for net photosynthesis (A(N)) in all species, and the species differences in A(N) were primarily driven by gm rather than stomatal conductance. The total electron flow through photosystem II (ETRII) nearly equaled the electron transport required for Rubisco carboxylation and oxygenation. Furthermore, blocking electron flow to photosystem I with appropriate inhibitors showed that electron flow to plastic terminal oxidase was not observed. As a result, these studied species showed little alternative electron flow mediated by water-water cycle or plastic terminal oxidase. By comparison, the ratio of electron transport consumed by photorespiration to ETRII (J(pR)/ETRII), ranging from 43% similar to 55%, was negatively correlated to A(N) and g(m). Furthermore, the increased ATP production required by enhanced photorespiration was regulated by cyclic electron flow around photosystem I. These results indicate that photorespiration is the major electron sink for dissipation of excess excitation energy in the alpine evergreen sclerophyllous Rhododendron species. The coordination of g(m) photorespiration and cyclic electron flow is important for sustaining leaf photosynthesis.

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