Responses of Leaf Color and Photosynthetic Characteristics to Heterogeneous Habitats in Introduced Acer palmatum
To investigate the leaf color and photosynthetic characteristics of introduced Acer palmatum Thunb.in different habitats,and to provide theoretical basis for its introduction and domestication,this study analyzed the effects of different habitats on leaf color,chlorophyll fluorescence parameters and pho-tosynthetic characteristics of 4-year-old grafted young plants of A.palmatum Thunb.varieties(HWJ,SJHF,CZM).Chlorophyll a(Chla),chlorophyll b(Chlb),carotenoid(Car),chlorophyll(Chls),maxi-mum fluorescence(Fm),initial carboxylation rate(α),maximum photochemical efficiency(Fv/Fm),ap-parent quantum efficiency(AQY)and maximum net photosynthetic rate(Pnmax)of A.palmatum Thunb.Plants growing in the low altitude and shady slope habitat were significantly lower than those of in others habitats(p<0.05).In the same habitat,the Pnmax,Anmax,α,AQY,Fv/Fm and photorespiration respira-tion rate(Rp)of'Sanji Huangfeng'were higher than those of'Hong Wuji'and'Chengzhimeng'.There were no significant differences in AQY,Rp,light compensation point(LCP),CO2 compensation point(CCP),dark respiration rate(Rd)and saturated intercellular CO2 concentration(CSP)(p>0.05)of'Sanji Huangfeng'in different habitats.The L*,a* and b* values of leaf color parameters among varie-ties were significantly different(p<0.01).Habitat and the interaction between habitat and variety had significant effects on Chla,Chlb,Chls,Car,LSP,AQY,CSP,Pnmax,Anmax,Fv/Fm and ETR(p<0.01),and pH,soil moisture content,altitude and direction of slope were the main controlling factors.The photosynthetic activity of A.palmatum Thunb.was significantly affected by the differences between habitats.Light capturing,light transferring and the photosynthetic pigments content for energy transfor-ming of'Sanji Huangfeng'were higher than those of the other two varieties in the same habitat,showing strong environmental adaptability of'Sanji Huangfeng'.
Acer palmatum Thunb.heterogenous habitatsphotosynthetic characteristicschlorophyll fluorescence parametersleaf color
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