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Photosynthetic Response of an Alpine Plant, Rhododendron delavayi Franch, to Water Stress and Recovery: The Role of Mesophyll Conductance

文献类型： 外文期刊

作者： Cai, Yanfei 1 ; Wang, Jihua 2 ; Li, Shifeng 2 ; Zhang, Lu 2 ; Peng, Lvchun 2 ; Xie, Weijia 2 ; Liu, Feihu 1 ;

作者机构： 1.Yunnan Univ, Sch Agr, Kunming, Peoples R China

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

3.Natl Engn Res Ctr Ornamental Hort, Kunming, Peoples R China

关键词： mesophyll conductance;photosynthetic limitation;recovery;Rhododendron delavayi;stomatal conductance;water stress

期刊名称：FRONTIERS IN PLANT SCIENCE （ 影响因子：5.753； 五年影响因子：6.612 ）

ISSN： 1664-462X

年卷期： 2015 年 6 卷

页码：

收录情况： SCI

摘要： Rhododendron delavayi Franch is an evergreen shrub or small tree with large scarlet flowers that makes it highly attractive as an ornamental species. The species is native to southwest China and southeast Asia, especially the Himalayan region, showing good adaptability, and tolerance to drought. To understand the water stress coping mechanisms of R. delavayi, we analyzed the plant's photosynthetic performance during water stress and recovery. In particular, we looked at the regulation of stomatal (g(s)) and mesophyll conductance (g(m)), and maximum rate of carboxylation (V-cmax). After 4 days of water stress treatment, the net CO2 assimilation rate (AN) declined slightly while g(s) and g(m) were not affected and stomatal limitation (S-L) was therefore negligible. At this stage mesophyll conductance limitation (MCL) and biochemical limitation (B-L) constituted the main limitation factors. After 8 days of water stress treatment, A(N), g(s), and gm had decreased notably. At this stage S-L increased markedly and MCL even more so, while B-L remained relatively constant. After re-watering, the recovery of A(N), g(s), and g(m) was rapid, although remaining below the levels of the control plants, while V-cmax fully regained control levels after 3 days of re-watering. MCL remained the main limitation factor irrespective of the degree of photosynthetic recovery. In conclusion, in our experiment MCL was the main photosynthetic limitation factor of R. delavayi under water stress and during the recovery phase, with the regulation of g(m) probably being the result of interactions between the environment and leaf anatomical features.

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