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Acta Prataculturae Sinica ›› 2013, Vol. 22 ›› Issue (2): 307-312.

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Comparative analysis on gas exchange characteristics of four geographical provenances of Nitraria tangutorum

CHONG Pei-fang1, SU Shi-ping1, GAO Ming1, LI Yi1, SUN Zhao-cheng2   

  1. 1.Forestry College, Gansu Agricultural University, Lanzhou 730070, China;
    2.Xiaobakou Branch of Shiyang River General Forestry Farm of Wuwei, Wuwei 733300, China
  • Received:2011-11-29 Online:2013-02-25 Published:2013-04-20

Abstract: Photosynthesis is one of the important activities which affect plant growth. The open gas exchange system, Locpro Portable Photosynthesis System, was used to study the change in daily photosynthesis and light-response curves of four geographic provenances (Jinta: JT, Linze: LZ, Minqin: MQ, Jiuzhoutai: JZT) of Nitraria tangutorumon. The daily change of net photosynthetic rate (Pn) and transpiration rate (Tr) of the four geographical provenances were single-peak curves. The Pn, stomatal conductance (Gs), water use efficiency (WUE), light saturation point (LSP) and light compensation point (LCP) of these provenances differed from Jinta, Linze and Minqin to Jiuzhoutai geographical provenance. The capacity of Jinta provenance using high intensity illumination was the highest, and its LSP was up to (1 800±68) μmol/m2·s. The capacity of Jiuzhoutai provenance using low light was higher than that of any other provenance and its LCP was (25.52±17) μmol/m2·s. The results from the four geographical provenances showed that N. tangutorum is a heliophyte and wide domain species with high adaptability to illumination. It is concluded that photosynthesis of N. tangutorum is very sensitive to variations of water because in the Jinta provenance original habitat it grew in the drought and had a high photosynthetic ability.

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