Photosynthetica 2019, 57(2):607-616 | DOI: 10.32615/ps.2019.085

Dorsoventral regulation of photosynthetic functions related to morphological and anatomical structures in field-grown sorghum

X. WANG1 ,2, Y. SHI1, Q. WANG3, Y. LI5
1 Tobacco Research Institute of Chinese Academy of Agricultural Sciences, 266101 Qingdao, China
2 Institute of Agricultural Resources and Regional Planning of Chinese Academy of Agricultural Sciences, 100081 Beijing, China
3 Guangdong Provincial Bioengineering Institute (Guangzhou Sugarcane Industry Research Institute), 510316 Guangzhou, China
5 School of Resources and Environment, Henan University of Economics and Law, 450046 Zhengzhou, China

The rapid dorsoventral regulation of photosynthesis is important because the light conditions around both surfaces of field-grown leaves vary considerably. The photosynthetic asymmetry has been intensively studied, but structure-related explanations for asymmetry were not exactly clarified. This study aimed to investigate the photosynthetic asymmetry in field-grown Sorghum bicolor L. and analyze the impacts of dorsoventral structures on photosynthesis. We found that the photosynthetic asymmetry changed with light conditions, and adaxial surfaces had higher primary photochemical activity owing to higher mesophyll density, while abaxial surfaces had higher CO2-diffusion capacity due to higher stomatal density, substomatal cavities, and contact areas between bundle sheath and mesophyll cells. Moreover, abaxial surfaces could mainly use self-transmitted light (residual light intercepted by adaxial surface) to drive photoreaction which could partly retain high photosynthetic rates in the field. This study can improve our understanding on the photosynthetic dorsoventral regulation.

Additional key words: chlorophyll a fluorescence; field; gas exchange; isobilateral leaf; leaf anatomy.

Received: July 31, 2018; Accepted: December 13, 2018; Prepublished online: April 29, 2019; Published: May 16, 2019  Show citation

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WANG, X., SHI, Y., WANG, Q., & LI, Y. (2019). Dorsoventral regulation of photosynthetic functions related to morphological and anatomical structures in field-grown sorghum. Photosynthetica, 57(2), 607-616. doi: 10.32615/ps.2019.085
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