PSII Activity Changes and Heat-tolerance Comparison of Different Rhododendron Cultivars under High Temperature Stress

doi:10.11924/j.issn.1000-6850.casb15030005

Abstract

Abstract: In order to understand the response mechanism of Rhododendron to high temperature stress and select cultivars with high heat-tolerance, appearance and chlorophyll fluorescence were investigated in R. obtusum‘Yanzhimi’, R. obtusum‘Turuimeigui’, R. obtusum‘Xiaoqinglian’, R. pulchrum‘Xiajinpao’, R. hybridum‘Jinpao’, R. hybridum‘Yanchun’and R. Championiae‘Zihe’under three high- temperature stresses (30℃/28℃ , 35℃/30℃ and 38℃/35℃ ). The chlorophyll fluorescence indexes included Fo (initial fluorescence), Fv/Fo (potential activity of PSII), Fv’/Fm’(efficiency of excitation capture of open PSII center) and NPQ (non-photochemical quenching). The results indicated that with the increase of treated days, Fo increased, Fv/Fo and Fv’/Fm’decreased. The fluorescence change was proportional to the stress strength and treated days. Moreover, NPQ reduced in the early stage and then increased. The change range of chlorophyll fluorescence was small in cultivars with high heat-tolerance while that was large in those with low heattolerance. The heat- tolerance of tested Rhododendrons was comprehensively evaluated with subordinate function. The cultivars with higher heat-tolerance were‘Yanzhimi’,‘Turuimeigui’and‘Xiaoqinglian’, and which could be applied to city landscape and partly substitute conventional cultivar‘Zihe’.

CLC Number:

S359.9

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