Effects of Shading on Anatomical Structure and Photosynthetic Characteristics of Ribes nigrum L. Leaves

doi:10.7525/j.issn.1673-5102.2017.04.006

Abstract

Abstract: We studied the anatomical structure and photosynthetic characteristics of Ribes nigrum L. leaves under different shading degrees(full sunlight, 20%, 60% of shading degree) and different shading time(early, middle, and late). The thickness of leaf under 20% and 60% shading treatments were lower than that under full sunlight treatment with significant differences, and the epidermis thickness were higher in the opposite way. The ratio of palisade tissue to spongy tissue decreased as the increase of shading degree, which increased with the extension of shading time. In early and middle shading stage, the photosynthetic rate(P_n) of 20% shading treatment was little higher than that under full sunlight treatment, but there was no significant difference(P>0.05), the transpiration rate(T_r) and water use efficiency(WUE) were changed in the same circumstances. The P_n of 60% shading treatments were lower than that under full sunlight treatment significantly(P<0.05). In late shading stage, the P_n of 60% shading treatments were significantly higher than that under full sunlight treatment(P<0.05), and the WUE, T_r and Stomatal Conductance(G_s) were higher than that under full sunlight and 20% shading treatment. Therefore, these changes of the anatomical structure were helpful for R.nigrum to improve the utilization of luminous energy, and different shading time resulted in the change of photosynthetic characteristics. With the photosynthetic characteristics and anatomical structure of R.nigrum leaves, the R.nigrum should be shadowed in different degrees(20% shading treatment in early and middle stage, 60% shading treatment in late stage) during the different stages, which can improve the efficiency of using light and water, maintain higher photosynthetic rate and retard the aging process.

Key words: Ribes nigrum L., shading, photosynthetic characteristics, anatomical structure

CLC Number:

Q945

LI Xin-Yan, TENG Zhi-Yuan, XU Qi-Jiang, ZHANG Hui-Hui, ZHENG Bao-Jiang. Effects of Shading on Anatomical Structure and Photosynthetic Characteristics of Ribes nigrum L. Leaves[J]. Bulletin of Botanical Research, 2017, 37(4): 521-528.

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