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Effects of drought stress on gas exchange and chlorophyll fluorescence characteristics in leaves of two pepper(Capsicum annuum L) varieties

Duan Zhi-hui

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Abstract

Gas exchange and chlorophyll fluorescence characteristics of two varieties of pepper(Capsicum annuum L) were studied in drought stress.The results showed that relative water content(RWC),relative electrolyte conductivity(REC),net photosynthetic rate(Pn) and the maximal photochemical efficiency of PSII(Fv/Fm) were decreased by treated 5 d under drought stress,especially in Jizhao×Jilin.Drought resulted in a decrease of stomatal conductance(Gs), but induced significantly increases of water use efficiency(WUE),non-photochemical quenching coefficient(NPQ) and the ratio of photorespiration rate and net photosynthetic rate(Pr/Pn),especially in Zhengjiao No.13.These results suggested that higher drought tolerance of pepper was associated with the capacity to keep higher WUE,NPQ and Pr/Pn under drought stress.

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What this paper is about

Gas exchange and chlorophyll fluorescence characteristics of two varieties of pepper(Capsicum annuum L) were studied in drought stress.The results showed that relative water content(RWC),relative electrolyte conductivity(REC),net photosynthetic rate(Pn) and the maximal photochemical efficiency of PSII(Fv/Fm) were decreased by treated 5 d under drought stress,especially in Jizhao×Jilin.Drought resulted in a decrease of stomatal conductance(Gs), but induced significantly increases of water use efficiency(WUE),non-photochemical quenching coefficient(NPQ) and the ratio of photorespiration rate and net photosynthetic rate(Pr/Pn),especially in Zhengjiao No.13.These results suggested that higher drought tolerance of pepper was associated with the capacity to keep higher WUE,NPQ and Pr/Pn under drought stress.

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Available abstract

Gas exchange and chlorophyll fluorescence characteristics of two varieties of pepper(Capsicum annuum L) were studied in drought stress.The results showed that relative water content(RWC),relative electrolyte conductivity(REC),net photosynthetic rate(Pn) and the maximal photochemical efficiency of PSII(Fv/Fm) were decreased by treated 5 d under drought stress,especially in Jizhao×Jilin.Drought resulted in a decrease of stomatal conductance(Gs), but induced significantly increases of water use efficiency(WUE),non-photochemical quenching coefficient(NPQ) and the ratio of photorespiration rate and net photosynthetic rate(Pr/Pn),especially in Zhengjiao No.13.These results suggested that higher drought tolerance of pepper was associated with the capacity to keep higher WUE,NPQ and Pr/Pn under drought stress.

Key concepts: Chlorophyll fluorescence, Photosynthesis, Photorespiration, Stomatal conductance, Pepper, Water-use efficiency, Capsicum annuum, Chemistry

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Effects of drought stress on gas exchange and chlorophyll fluorescence characteristics in leaves of two pepper(Capsicum annuum L) varieties — Research Paper | ScholarLens