Photosynthetica 2022, 60(2):168-178 | DOI: 10.32615/ps.2021.064

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

X.F. YU1, †, X.Y. MING1, †, M. XIONG1, C. ZHANG2, L.J. YUE1, L. YANG1, C.Y. FAN1
1 College of Landscape Architecture, Sichuan Agricultural University, 611130 Chengdu, China
2 Industrial Crop Research Institute, Sichuan Academy of Agricultural Sciences, 610300 Chengdu, China

To study the light intensity suitable for Bletilla ochracea 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. B. ochracea 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 B. ochracea greatly increased under 76.4% shade.

Additional key words: Bletilla ochracea Schltr.; chlorophyll fluorescence; photosynthesis; shade.

Received: November 24, 2020; Revised: December 3, 2021; Accepted: December 6, 2021; Prepublished online: January 20, 2022; Published: May 2, 2022  Show citation

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YU, X.F., MING, X.Y., XIONG, M., ZHANG, C., YUE, L.J., YANG, L., & FAN, C.Y. (2022). Partial shade improved the photosynthetic capacity and polysaccharide accumulation of the medicinal plant Bletilla ochracea Schltr. Photosynthetica, 60(2), 168-178. doi: 10.32615/ps.2021.064
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