Photosynthetica, 2019 (vol. 57), issue 4

Photosynthetica 2019, 57(4):1156-1164 | DOI: 10.32615/ps.2019.136

Changes in photosynthetic and chlorophyll fluorescence characteristics of sorghum under drought and waterlogging stress

F. ZHANG1,2, K. ZHU2, Y.Q. WANG2, Z.P. ZHANG2, F. LU2, H.Q. YU1, J.Q. ZOU2
1 Agronomy Courtyard, Shenyang Agricultural University, Dongling Road 120, Shenhe District, Shenyang, 110866 Liaoning, China
2 Sorghum Institute, Liaoning Academy of Agricultural Sciences, Dongling Road 84, Shenyang, 110161 Liaoning, China

Water stress is a key factor limiting sorghum growth and yield potential. This study investigated the changes in morphology, photosynthetic parameters, and fluorescence characteristics of sorghum under drought and waterlogging stress. The results indicated that these two types of water stress limited sorghum growth and led to a decrease in leaf chlorophyll (Chl), especially Chl a, which was accompanied by a decrease in net photosynthetic rate. In addition, under both types of water stress, the light-compensation point (LCP) and light-saturation point (LSP) both decreased, but the effect on these parameters was more obvious under drought. In terms of fluorescence parameters, the initial fluorescence and variable fluorescence increased under drought and waterlogging stress, while the maximum fluorescence did not change significantly, and the electron transport rate, photochemical quenching, and PSII actual quantum yield decreased. In summary, these results suggest that sorghum adapts to drought and waterlogging stress by reducing the leaf Chl a content, reducing LCP and LSP, and changing fluorescence parameters.

Keywords: drought stress; excessive soil moisture; gas exchange; photosynthesis; Sorghum bicolor.

Received: June 15, 2019; Accepted: October 2, 2019; Prepublished online: October 22, 2019; Published: November 1, 2019Show citation

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ZHANG, F., ZHU, K., WANG, Y.Q., ZHANG, Z.P., LU, F., YU, H.Q., & ZOU, J.Q. (2019). Changes in photosynthetic and chlorophyll fluorescence characteristics of sorghum under drought and waterlogging stress. Photosynthetica, 57(4), 1156-1164. doi: 10.32615/ps.2019.136.
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