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cje ›› 2012, Vol. 31 ›› Issue (11): 2817-2822.

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Effects of spraying calcium on the inflorescence stem quality and leaf photosynthesis of herbaceous peony (Paeonia lactiflora Pall.).

LI Cheng-zhong1,2, TAO Jun1**, SUN Yan2, KONG Fen1, GENG Qing-ping1, DU Bei1   

  1. (1College of Horticulture and Plant Protection, Yangzhou University, Yangzhou 225009, Jiangsu, China; 2Department of Landscape Architecture and Horticulture, Yangzhou Vocational College of Environment and Resources, Yangzhou 225127, Jiangsu, China)
  • Online:2012-11-10 Published:2012-11-10

Abstract: Taking 5-year old herbaceous peony (Paeonia lactiflora Pall.) as test material, a pot experiment was conducted to study the effects of spraying calcium (4%, w/v) on the inflorescence stem quality and leaf photosynthetic characteristics of the plant. Under the spraying of calcium, the mechanical strength of the inflorescence stem increased significantly by 24.3%, and the cellulose, semicellulose, lignin, and pectin contents in the inflorescence stem all increased significantly, among which, the cellulose content reached 456.54 μg·g-1 and enhanced by 28.5%, as compared with the control. The leaf net photosynthetic rate (Pn), stomatal conductance (Gs), transpiration rate (Tr), and water use efficiency also increased, with the Pn up to 17.07 μmol·m-2·s-1 28 days after calcium application and enhanced by 29.6%, and the Gs, Tr and WUE enhanced by 55%, 20%, and 7.6%, respectively, as compared with the control. In addition, spraying calcium led to an increase of the maximum net photosynthetic rate (Pmax) and the light saturation point, which were up to 20.71 μmol·m-2·s-1 and 902.5 μmol·m-2·s-1 and enhanced by 24.6% and 7.5%, respectively, but led to a significant decrease of light compensation point, which was 7.27 μmol·m-2·s-1 and decreased by 34.5%.

Key words: semivariance function, flooded area of the Yellow River, soil phosphorus, Kriging interpolation, spatial variation.