Objective:To explore the adaptive response mechanisms of Rhododendron L.species grown at low altitudes.Methods:Five Rhododendron species were selected for this study.The relation-ship between altitude and leaf length/width ratio,photosynthetic pigment content,anthocyanin con-tent,and malondialdehyde(MDA)level were analyzed to investigate their morphological and physio-logical adaptability in low-altitude areas.Results:(1)The leaf length/width ratios of the five Rhodo-dendron species showed no significant changes with altitude variations.(2)The levels of chlorophyll a,chlorophyll b,and anthocyanins generally decreased as altitude increased.(3)MDA levels in R.mu-cronatum,R.simsii,and R.×pulchrum decreased with rising altitude,whereas those in R.latoucheae and R.simiarum increased,although R.latoucheae maintained lower MDA levels at both tested alti-tudes.Conclusion:The five Rhododendron species exhibited certain adaptability to both of the cultiva-tion altitudes.
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