Partial shade improved the photosynthetic capacity and polysaccharide accumulation of the medicinal plant Bletilla ochracea Schltr

To study the light intensity suitable for Schltr., morphology, photosynthetic parameters, and polysaccharide content of seedlings were evaluated under different light intensities. All shade treatments promoted plant growth and net photosynthetic rate while having no significant effect on transpirati...

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Bibliographic Details
Published in:Photosynthetica 2022-01, Vol.60 (2), p.168-178
Main Authors: Yu, X F, Ming, X Y, Xiong, M, Zhang, C, Yue, L J, Yang, L, Fan, C Y
Format: Article
Language:English
Subjects:
bletilla ochracea schltr
chlorophyll fluorescence
photosynthesis
shade
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Summary:To study the light intensity suitable for Schltr., morphology, photosynthetic parameters, and polysaccharide content of seedlings were evaluated under different light intensities. All shade treatments promoted plant growth and net photosynthetic rate while having no significant effect on transpiration rate. The maximum photochemical efficiency and potential photochemical efficiency reached the lowest values under full sunlight. The electron transport rate and photochemical quenching under shade were significantly higher than those under full light, while nonphotochemical quenching was the highest under full light. This indicated that the shade alleviated photoinhibition in summer and improved the utilization of light. could adapt to different light intensities, enhancing photosynthetic efficiency under low light by improving the electron transport and the degree of opened PSII reaction centers, and adapting to high light by increasing heat dissipation. Plant growth, photosynthesis, and polysaccharide accumulation of greatly increased under 76.4% shade.
ISSN:0300-3604
1573-9058
1573-9058
DOI:10.32615/ps.2021.064