Welcome to Chinese Agricultural Science Bulletin,

Chinese Agricultural Science Bulletin ›› 2014, Vol. 30 ›› Issue (27): 43-47.doi: 10.11924/j.issn.1000-6850.2014-0491

Special Issue: 资源与环境 油料作物 园艺 农业生态

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Comparison of Net Photosynthetic Rate of Brassica napus Along with the Environmental Variation in Different Ecological Regions

  

  • Received:2014-02-28 Revised:2014-02-28 Accepted:2014-05-26 Online:2014-10-15 Published:2014-10-15

Abstract: In order to study the difference of photosythesis between spring rape area and winter rape area, the hybrid of Brassica napus‘Qinzayou No.3’was chosen to compare the difference of net photosynthetic rate of the two areas under different illumination, CO2 concentration and temperature. The results were as below: the change trends of net photosynthetic rate of spring rape area and winter rape area were similar along with the change of illumination, CO2 concentration and temperature. The light quantum efficiency and light saturation point of leaf in spring rape area were higher than that in winter rape area, in contrast with the light compensation point; light respiration rate and net photosynthetic rate under the saturated illumination in spring rape area were lower than that in winter rape area. The carboxylation efficiency in spring rape area were higher than that in winter rape area, but the CO2 saturation point and the net photosynthetic rate under the saturated CO2 concentration in spring rape area were lower than that in photosythetic capacity of leaf in spring rape area was better than that in winter rape area and the rape in spring rape area had the bigger adaptation to environment.winter rape area and the CO2 compensation point in two areas had no significant difference. The temperature range that was suitable for photosynthetic reaction in spring rape area was wider than that in winter rape area and the net photosynthetic rate under optimum temperature in spring rape area was lower than that in winter rape area. The results indicated that the photosythetic capacity of leaf in spring rape area was better than that in winter rape area and the rape in spring rape area had the bigger adaptation to environment.