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Acta Prataculturae Sinica ›› 2009, Vol. 18 ›› Issue (6): 254-258.

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A study on the photosynthetic characteristics of Paspalum atratum

LIU Jin-xiang, CHEN Wei-yun, XIAO Sheng-hong   

  1. Tropical Institute of Grassland Science, Zhanjiang Normal University, Zhanjiang 524048, China
  • Received:2008-09-16 Online:2009-12-20 Published:2009-12-20

Abstract: Paspalum atratum is a perennial forage grass. This field study investigated the photosynthetic characteristics of P. atratum. Gas exchange was measured using a LI-6400 portable photosynthesis system on clear days in May. The photosynthesis showed a double-peak with a considerable noon inhibition, and belonged to the stomatal limitation type. The first peak appeared at about 11:30 a.m. when Pn reached 28.8 μmol/(m2·s) while the second peak appeared at about 15:00 when Pn was 21.59 μmol/(m2·s). The change was positively related to variations of Gs and Tr. The light saturation and compensation points, and apparent quantum yield of P. atratum were about 1 700 and 20 μmol/(m2·s), and 0.073 9 mol/mol, respectively. The CO2 saturation and compensation points, carboxylation efficiency were 600.01 and 21.89 μmol/mol, and 0.084 6 μmol/(m2·s), respectively.

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