Chin J Plant Ecol ›› 2009, Vol. 33 ›› Issue (2): 347-354.DOI: 10.3773/j.issn.1005-264x.2009.02.012

• Research Articles • Previous Articles     Next Articles

LEAF ANATOMICAL STRUCTURE AND PHOTOSYNTHETIC PHYSIOLOGICAL CHARACTERISTICS OF C4 DESERT SPECIES SALSOLA COLLINA ANDS. ARBUSCULA

GAO Song(), SU Pei-Xi, YAN Qiao-Di, DING Song-Shuang, ZHANG Ling-Mei   

  1. Linze Inland River Basin Research Station, Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou 730000, China
  • Received:2008-04-03 Accepted:2008-11-24 Online:2009-04-03 Published:2009-03-31

Abstract:

Aims We studied the physiological and ecological characteristics of Salsola collina and S. arbuscula in order to provide a theoretical basis for understanding their physiological and ecological mechanisms of adaptation to their habitats.

Methods We chose representative plants and collected mature leaves for anatomical structure analysis, measured leaf gas exchange parameters under natural conditions in their mixed community and compared drought structures and photosynthetic characteristics of the two species.

Important findings Salsola collina leaves had epidermal hairs and more developed water storage parenchyma. Salsola arbuscula leaves had thicker cuticles with a layer of hypodermal cells under them, and the palisade cells were longer and arranged more densely. The net photosynthetic rate of S. collina was significantly higher than that of S. arbuscula, with daily mean values of 21.5 and 15.7 μmol CO2·m-2·s-1, respectively. The transpiration rate of S. collina was also higher than S. arbuscula, with daily mean values of 14.9 and 10.2 mmol·m-2·s-1, respectively. The daily mean values of water use efficiency of S. collina and S. arbuscula were 1.39 and 1.53 μmol CO2·mmol-1H2O, respectively; especially at 14:00, they were 1.61 and 2.30 μmol CO2·mmol-1H2O, respectively,S. arbuscula was 42% higher than S. collina approximately. The light compensation point and CO2 compensation point of S. collina were lower and its light saturation point and photo-quantum efficiency were higher than S. arbuscula. These findings indicate that the drought structures of the two species are different, and S. arbuscula has more desert plant features. In the community suitable for the growth of both species, the photosynthetic capacity of S. collina was stronger than S. arbuscula, and the water use efficiency of S. arbuscula was higher.

Key words: Salsola collina, Salsola arbuscula, photosynthesis, C4desert species