Photosynthetica 2020, 58(5):1210-1216 | DOI: 10.32615/ps.2020.071

Phenolic acids inhibit the photosynthetic productivity of poplar

K. LI2, T. ZHANG2, H. LI1, L.D. ZHANG3, F. LI5
1 College of Agriculture and Forestry Science, Linyi University, 276000 Lin'yi, China
2 Taishan Forest Ecosystem Research Station/Key Laboratory of State Forestry Administration for Silviculture of the Lower Yellow River, 271018 Tai'an, Shandong, China
3 Station for State-owned Forest Farm Management of Shandong Province, 250014 Ji'nan, Shandong, China
5 State-owned Yishan Forest Farm of Yishui County, 276400 Yi'shui, Shandong, China

Barriers to continuous cropping of poplar plantations are closely related to the accumulation of phenolic acids in the soil. The purpose of this study was to explore the mechanism through which phenolic acid stress affects poplar productivity. The results showed that phenolic acids had a significant inhibitory effect on the photosynthesis of poplar. The inhibition of photosynthesis due to phenolic acids occurred mainly because, during electron transfer at the PSII reaction center, the primary quinone acceptor of PSII (QA) in the oxidized state was reduced, and excess light energy was lost in the form of heat dissipation; thus, poplar productivity decreased. At low phenolic acid concentrations (0X-1.5X), the activity of the PSII reaction center was temporarily inactivated, mainly because of stomatal limiting factors. At high phenolic acid concentrations (1.5X-3.0X), the PSII reaction centers were damaged, and photoinhibition occurred, mainly because of nonstomatal limiting factors.

Additional key words: chlorophyll fluorescence; continuous cropping; gas exchange; nonphotochemical quenching; poplar.

Received: July 12, 2020; Revised: September 14, 2020; Accepted: October 5, 2020; Prepublished online: October 29, 2020; Published: December 8, 2020  Show citation

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LI, K., ZHANG, T., LI, H., ZHANG, L.D., & LI, F. (2020). Phenolic acids inhibit the photosynthetic productivity of poplar. Photosynthetica58(5), 1210-1216. doi: 10.32615/ps.2020.071
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