Chin J Plan Ecolo ›› 2003, Vol. 27 ›› Issue (4): 454-458.doi: 10.17521/cjpe.2003.0065

• Research Articles • Previous Articles     Next Articles

Effects of a-NAA and UV-B Radiation on the Growth and Transpiration of Trichosanthes kirilowii Seedling

LIU Yun, ZHONG Zhang-Cheng, LONG Yun, CAO Guo-Xing, Marinus J. A. WERGER   

  • Online:2015-11-04 Published:2003-04-10
  • Contact: JIANG Li-Geng

Abstract:

The depletion of the stratospheric ozone layer has been well documented. So ultraviolet-B (UV-B) radiation (280-320 nm) reaching the earth surface has increased since the 1970s. Although extensive studies were conducted about negative biological and ecological effects of enhanced UV-B radiation, little was known about the inside mechanism and effects of increased UV-B irradiation and feasible protective measures of plants. In this paper, the effects of naphthyl acetic acid (α-NAA) (2 mg·L-1) and UV-B radiation (0.029 J·m-2·s-1) on the growth and transpiration rate in pots in greenhouse-grown Trichosanthes kirilowii seedlings were investigated. Four treatments were included in the experiment: no addition of α-NAA and UV-B radiation (T0), addition of α-NAA (T1), exposure to enhanced UV-B radiation (T2), addition of α-NAA and exposure to UV-B radiation (T3). The results showed that enhanced UV-B radiation reduced the height and leaf area of plants, and the weight of roots, stems and leaves. As a result, total biomass and accumulation of dry matter were decreased. Exposure to UV-B radiation significantly increased the stomatal diffuse resistance and decreased the transpiration rate; however it hardly affected the water content of seedlings. Compared to the controls (T0), addition of α-あ??脴?膟?膗

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