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Comparative study on the photosynthesis and chlorophyll fluorescence of four Gesneriaceae species

Eco-physiology parameters,photosynthesis and chlorophyll fluorescence of four endangered Gesneriaceae species,Hemiboea henryi Clarke,Boea clarkeana Hemsl.,Chirita eburnea Hance,and Didymocarpus cortusifolius(Hance) W.T.Wang,were determined.The curve of diurnal variation of leaf photosyntheses of these Gesneriaceae species were similar and showed two peaks in a day with "Wuxiu" phenomenon.The low light compensation points and light saturation points and the high CO2 compensation points and CO2 saturation points suggested that low irradiation(600～750 μmol·m-2·s-1) and high CO2 concentration(1 277～1 965 mg/m3) would enhance plant growth and development.The study on chlorophyll fluorescence parameters of four Gesneriaceae species showed that the quantum yield of PSⅡ linear electron(Yield) and photochemical quenching coefficient(qP) decreased as photosynthetic active radiation(PAR) increased from 0 to 1 400 μmol·m-2·s-1,while the apparent photosynthetic electron transport rate(ETR) and coefficients of non-photochemical fluorescence quenching(qN) had reverse trends.The values of Yield,ETR,qP and qN obtained from the four Gesneriaceae species had the different sequences,i e,D.cortusifoliusC.eburneaH.henryB.clarkeana for Yield,ETR and qP,and C.eburneaH.henryiD.cortusifoliusB.clarkeana for qN.The chlorophyll fluorescence parameters of four Gesneriaceae species showed that the photosynthetic physiological functions of C.eburnea were better than those of the others,and it would be a suitable candidate used as preference species.