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Bulletin of Botanical Research ›› 2009, Vol. 29 ›› Issue (2): 182-186.doi: 10.7525/j.issn.1673-5102.2009.02.010

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A Comparative Study of Photosynthetic Characteristics of Caragana davazamcii Between Plants of Different Ages in Huangfuchuan Basin of Ordos Plateau

GAO Zeng-Lu;GAO Yu-Bao*;ZHENG Zhi-Rong;ZHANG Xiao-Chun   

  1. (College of Life Science,Nankai University,Tianjin 300071)
  • Received:1900-01-01 Revised:1900-01-01 Online:2009-03-20 Published:2009-03-20
  • Contact: GAO Yu-Bao
  • Supported by:

Abstract: The photosynthetic characteristics of Caragana davazamcii plants of different ages were investigated. The net Photosynthetic rate(Pn) and transpiration rate(Tr) of mid-aged plants(5 years old) were higher than those of senile plants(24 years old). The decrease of Pn in senile plants between 12:00-14:00 was caused by non-stomatal factors that impaired photosystem Ⅱand photosynthetic capacity of the leaves, while that in mid-aged plants was a consequence of both stomatal and non-stomatal inhibition. The determination of photosynthetic pigment contents showed that the contents of chlorophyll and carotenoid in mid-aged plants were significantly higher than those in senile plants, so that the mid-aged plants had higher Pn, LUE and capcity of intensive radiation adaptation. In addition, the mid-aged plants had higher WUE, which made them more tolerant to drought, so the mid-aged plants were able to adapt to the local envioronments with high temperature and severe drought.

Key words: Age-classes, Caragana davazamcii, photosynthetic physiological characteristics, water utilization efficiency

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