Photosynthetic characteristics and waterlogging tolerance evaluation of six northern flowering shrubs under waterlogging stress
In this study,six northern flowering shrubs of 0-15 days of waterlogging stress,such as Prunus triloba var.plena,Forsythia viridissima,Cotoneaster multiflorus,Deutzia parviflorha,Hydrangea paniculata and Viburnum opulus were used as materials.The root growth,plant morphology,photosynthetic gas ex-change and chlorophyll fluorescence parameters were measured.The results showed that the root dry weight,root total length and root surface area of 5 flowering shrubs,such as P.triloba var.plena,F viridissi-ma,C.multiflorus,D.parviflorha and H.paniculata,increased firstly and then decreased with the increase of waterlogging time,while that of V.opulus showed a decreasing trend.The chlorophyll fluorescence index-es,such as leaf water content,specific leaf weight,maximum photosynthetic efficiency of PSII(Fv/Fm),light energy absorbed per unit reaction center(RC/ABS),potential photosynthetic transformation and utili-zation capacity(PI),net photosynthetic rate(Pn),stomatai conductance(Gs),intercellular CO2 concentra-tion(Ci),and other photosynthetic indexes of the six flowering shrubs leaves were decreased compared with those of controls.According to the measured indicators,the waterlogging tolerance of plants was evaluated through principal component analysis and other methods.The results showed that waterlogging stress led to browning and decay of plant roots,and plants showed wilting,falling leaves,and even death.With the increase of waterlogging time,the photosynthetic system of six flowering shrubs showed varying degrees of damage.The results of principal component analysis showed that the waterlogging stress mainly affected plant roots,and further affected plant light and system.In the final evaluation,the water-logging tolerance of the six plants was ranked as V opulus＞F.viridissima＞D.parviflorha＞C.multiflorus＞H.paniculata＞P.triloba var.plena.
waterlogging stresschanges of rootmorphological characteristicsphotosynthetic character-isticschlorophyll fluorescence characteristicsflowering shrub
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