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The effects of para-hydroxybenzoic acid treatment on photosynthetic parameters of Populus × euramericana “Neva”

Liang, G.T., Zhang, S.Y., Guo, J., Yang, R., Li, H., Fang, X.C., Zhang, G.C.
Photosynthetica 2018 v.56 no.2 pp. 505-511
4-hydroxybenzoic acid, Populus, acid treatment, allelochemicals, allelopathy, continuous cropping, photosynthesis, pot culture, seedlings, trees, China
As a common tree species in northern China, Populus × euramericana “Neva” has an important practical value for the study of continuous cropping obstacles in poplar cultivation. Plant allelopathy is the main reason for continuous cropping obstacles, which are caused by allelochemicals, such as para-hydroxybenzoic acid (p-HB). The objective of this study was to investigate the effects of p-HB on the photosynthesis of poplar. Photosynthetic parameters of Populus × euramericana “Neva” poplar were determined in a pot culture experiment where five p-HB concentrations were used (0, 1, 2, 4, and 6 mmol L⁻¹). Each seedling was treated with 4 L of p-HB solution every seven days, ten times in total. p-HB inhibited the photosynthesis of poplar significantly, as shown by a clear decline in the net photosynthetic rate. Our results indicated nonstomatal limitation responsible for the photosynthesis reduction.