Medicinal Plant

2011, v.2(09) 36-39

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

摘要(Abstract):

[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.

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基金项目(Foundation): 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)

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