Abstract
OBJECTIVE To investigate the effects of different concentrations of exogenous salicylic acid on photosynthesis and chlorophyll fluorescence in Pinellia ternata under daejeon temperature above 30 ℃.METHODS SA of different concentration was sprayed to the plant as it grew about 15 cm high.Then the chlorophyll content,the photosynthetic indicators and chlorophyll fluorescence indicators were measured after 3 times spray.RESULTS 0.1-1 mmol·L-1 SA pretreatment increased chlorophyll contents,the ratio of chlorophyll a to b,the net photosynthetic rate(Pn),transpiration rate(Tr),stomatal conductance(Gs),photochemical efficiency(Fv/Fm),quantum yield of PSⅡ(ΦPSⅡ),maximum fluorescence value(Fm) and photochemical quenching(qP),but inhibited intercellular CO2 concentration(Ci,initial fluorescence value(Fo) and nonphotochemical quenching(NPQ).CONCLUSION SA shows a protective role against the photosynthetic system under high temperature stress.Comparatively,lower concentration of SA(0.5 mmol·L-1) was the most efficient.
Key words
Pinellia ternata /
salicylic acid /
photosynthesis /
chlorophyll fluorescence
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XUE Jin-ping;WNG Xing;ZHNG i-min;CHNG Li.
Effects of Salicylic Acid on Photosynthesis and Chlorophyll Fluorescence in Pinellia ternata Leaves under High Temperature [J]. Chinese Pharmaceutical Journal, 2008, 43(24): 1855-1858
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