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Photosynthetic physioecology characteristics of Kingdonia uniflora

Yue Ming

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Abstract

By using CI-301PS portable photosynthesis system,this paper studied the photosynthetic characteristics of Kingdonia uniflora under natural condition.The results showed that the diurnal change of net photosynthetic rate(Pn) presented a bimodal pattern,i.e.,reached the maximum at 13:30 and 16:30,and had a midday depression.The diurnal variation patterns of leaf transpiration rate(Tr) and water use efficiency(WUE) were also bimodal.There were significant polynomial regressive relationships between Pn and photosynthetic active radiation(PAR),Tr and stomatal conductance(Gs)(R2=0.2082,0.2016 and 0.0582,respectively,n=129,P0.05),while no significant correlation was observed between Pn and air temperature(Ta)(P0.05).The light compensation point(LCP) was 14.93 μmol·m-2·s-1,and the light saturation point(LSP) was 215.76 μmol·m-2·s-1,suggesting that K.uniflora could only adapt to restricted light condition.

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What this paper is about

By using CI-301PS portable photosynthesis system,this paper studied the photosynthetic characteristics of Kingdonia uniflora under natural condition.The results showed that the diurnal change of net photosynthetic rate(Pn) presented a bimodal pattern,i.e.,reached the maximum at 13:30 and 16:30,and had a midday depression.The diurnal variation patterns of leaf transpiration rate(Tr) and water use efficiency(WUE) were also bimodal.There were significant polynomial regressive relationships between Pn and photosynthetic active radiation(PAR),Tr and stomatal conductance(Gs)(R2=0.2082,0.2016 and 0.0582,respectively,n=129,P0.05),while no significant correlation was observed between Pn and air temperature(Ta)(P0.05).The light compensation point(LCP) was 14.93 μmol·m-2·s-1,and the light saturation point(LSP) was 215.76 μmol·m-2·s-1,suggesting that K.uniflora could only adapt to restricted light condition.

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Available abstract

By using CI-301PS portable photosynthesis system,this paper studied the photosynthetic characteristics of Kingdonia uniflora under natural condition.The results showed that the diurnal change of net photosynthetic rate(Pn) presented a bimodal pattern,i.e.,reached the maximum at 13:30 and 16:30,and had a midday depression.The diurnal variation patterns of leaf transpiration rate(Tr) and water use efficiency(WUE) were also bimodal.There were significant polynomial regressive relationships between Pn and photosynthetic active radiation(PAR),Tr and stomatal conductance(Gs)(R2=0.2082,0.2016 and 0.0582,respectively,n=129,P0.05),while no significant correlation was observed between Pn and air temperature(Ta)(P0.05).The light compensation point(LCP) was 14.93 μmol·m-2·s-1,and the light saturation point(LSP) was 215.76 μmol·m-2·s-1,suggesting that K.uniflora could only adapt to restricted light condition.

Key concepts: Photosynthesis, Compensation point, Transpiration, Stomatal conductance, Horticulture, Botany, Diurnal temperature variation, Water-use efficiency

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