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Anatomical and diffusional determinants inside leaves explain the difference in photosynthetic capacity between Cypripedium and Paphiopedilum, Orchidaceae
Yang, Zhong-Hui1,2,3; Huang, Wei1,2; Yang, Qiu-Yun1,2; Chang, Wei1,2; Zhang, Shi-Bao1,2
2018-06-01
Source PublicationPHOTOSYNTHESIS RESEARCH
ISSN0166-8595
Volume136Issue:3Pages:315-328
AbstractComparing with other angiosperms, most members within the family Orchidaceae have lower photosynthetic capacities. However, the underlying mechanisms remain unclear. Cypripedium and Paphiopedilum are closely related phylogenetically in Orchidaceae, but their photosynthetic performances are different. We explored the roles of internal anatomy and diffusional conductance in determining photosynthesis in three Cypripedium and three Paphiopedilum species, and quantitatively analyzed their diffusional and biochemical limitations to photosynthesis. Paphiopedilum species showed lower light-saturated photosynthetic rate (A (N)), stomatal conductance (g (s)), and mesophyll conductance (g (m)) than Cypripedium species. A (N) was positively correlated with g (s) and g (m). And yet, in both species A (N) was more strongly limited by g (m) than by biochemical factors or g (s). The greater g (s) of Cypripedium was mainly affected by larger stomatal apparatus area and smaller pore depth, while the less g (m) of Paphiopedilum was determined by the reduced surface area of mesophyll cells and chloroplasts exposed to intercellular airspace per unit of leaf area, and much thicker cell wall thickness. These results suggest that leaf anatomical structure is the key factor affecting g (m), which is largely responsible for the difference in photosynthetic capacity between those two genera. Our findings provide new insight into the photosynthetic physiology and functional diversification of orchids.
KeywordLeaf Anatomy Mesophyll Conductance Orchidaceae Photosynthetic Limitations Stomatal Conductance
DOI10.1007/s11120-017-0466-8
Language英语
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Document Type期刊论文
Identifierhttp://ir.kib.ac.cn/handle/151853/61236
Collection资源植物与生物技术所级重点实验室
Affiliation1.Chinese Acad Sci, Kunming Inst Bot, Key Lab Econ Plants & Biotechnol, Kunming 650201, Yunnan, Peoples R China
2.Yunnan Key Lab Wild Plant Resources, Kunming 650201, Yunnan, Peoples R China
3.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
Recommended Citation
GB/T 7714
Yang, Zhong-Hui,Huang, Wei,Yang, Qiu-Yun,et al. Anatomical and diffusional determinants inside leaves explain the difference in photosynthetic capacity between Cypripedium and Paphiopedilum, Orchidaceae[J]. PHOTOSYNTHESIS RESEARCH,2018,136(3):315-328.
APA Yang, Zhong-Hui,Huang, Wei,Yang, Qiu-Yun,Chang, Wei,&Zhang, Shi-Bao.(2018).Anatomical and diffusional determinants inside leaves explain the difference in photosynthetic capacity between Cypripedium and Paphiopedilum, Orchidaceae.PHOTOSYNTHESIS RESEARCH,136(3),315-328.
MLA Yang, Zhong-Hui,et al."Anatomical and diffusional determinants inside leaves explain the difference in photosynthetic capacity between Cypripedium and Paphiopedilum, Orchidaceae".PHOTOSYNTHESIS RESEARCH 136.3(2018):315-328.
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