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Study on the Diurnal Variation of Photosynthesis of Platycodon grandiflorum A.DC in the Hilly Region of Shangluo

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【Author】 PENG Xiao-bang Department of Biological and Medical Engineering,Shangluo College,Shangluo,Shaanxi 726000,China

【摘要】 [Objective] To study the diurnal variation of photosynthesis of Platycodon grandiflorum A.DC,in order to provide references for its cultivation.[Method] By using Li-6400 portable photosynthesis system,the photosynthetic rate,transpiration rate,stomatal conductance,intercellular CO2 concentration and photosynthetic active radiation of Platycodon grandiflorum A.DC at different time periods was detected,and its photoresponse curve was fitted.[Result] The diurnal variation of photosynthetic rate showed a two-peaked curve and an obvious "noon-break".As indicated by the correlation analysis result,the noon decrease of photosynthetic rate was caused by the stomata factors.The light saturation point,light compensation point and apparent quantum yield were 1 418 μmol/(m2·s) ,68 μmol/(m2·s) and 0.067 7,respectively.[Conclusion] Platycodon grandiflorum A.DC was a shade plant that had strong ability to utilize low light.

【基金】 Supported by Natural Science Foundation of Shaanxi Province(2010JQ3007);Science and Technology Plan Project of Shangluo Municipal Government(09skj001);Starting Foundation for PhD of Shangluo College(09sky024)
  • 【分类号】S567.239
  • 【被引频次】2
  • 【下载频次】25
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