Chin J Plant Ecol ›› 2008, Vol. 32 ›› Issue (6): 1356-1361.DOI: 10.3773/j.issn.1005-264x.2008.06.016

• Original article • Previous Articles     Next Articles

COMPARISON OF NEW AND SEVERAL CLASSICAL MODELS OF PHOTOSYNTHESIS IN RESPONSE TO IRRADIANCE

YE Zi-Piao1,*(), YU Qiang2   

  1. 1College of Sciences, Jinggangshan University, Ji’an, Jiangxi 343009, China
    2Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101, China
  • Received:2007-09-30 Accepted:2008-02-27 Online:2007-09-30 Published:2008-11-30
  • Contact: YE Zi-Piao

Abstract:

Aims Our objective is to compare a new photosynthetic light-response model with the non-rectangular hyperbola, rectangular hyperbola, and Prado-Moraes model in fitting data and obtaining the maximum net photosynthetic rate and the light saturation point.

Methods We measured the light-response of photosynthetic rate of winter wheat (Triticum aestivum) under the same chamber CO2 concentration and different air temperatures in North China Plain using a gas analyzer Li-6400. The measured data were simulated by the new photosynthetic light-response model and the non-rectangular hyperbola, rectangular hyperbola and Prado-Moraes models, respectively.

Important findings The new photosynthetic light-response model shows advantage over the non-rectangular hyperbola, rectangular hyperbola, and Prado-Moraes models in fitting data on the maximum net photosynthetic rate and the light saturation point. The main photosynthetic parameters calculated by the new one were very close to the measured data (R2=0.999 4 and R2=0.998 7). Results showed that the apparent quantum was not an ideal indicator to assess the light use efficiency of plants. We suggest the apparent quantum yield be replaced by the quantum yield at the light compensation point due to the unity of the quantum yield for any C3plantspecies under certain environmental conditions.

Key words: new photosynthetic light-response model, winter wheat (Triticum aestivum), the maximum net photosynthetic rate, light saturation point, apparent quantum yield