Chlorophyll Fluorescence Response of Mikania micrantha to the Infection by Cuscuta campestris with Imaging Fluorescence Technique
[ Objective] There were different effects of infection by Cucuta campestris on Mikania micrantha leaves at different leaf position. [Method]Chlorophyll imaging technology and spectrophotometer were adopted to determine the effect. [Result]The negative effects were significant in the maximum efficiency of PSⅡ photochemistry Fv/Fm of the 4th and 5th leaf, and also in the relative rate of electron transport ETR of the 8th and 9th leaf. However, there was no significant effects on the photochemical quenching coefficient qP, non-photochemical quenching coefficient NPQ and the maximum rate of electron transport ETRn of the host. Meanwhile, infection changed the spatial homogeneity of fluorescence parameters. The total contents of chlorophyll and carotenoids of the 4th -9th leaves were lower in the infected host than in the control non-significantly, but significantly lower in the chlorophyll a/b ratio of 6th, 7th and 9th. [ Conclusion ] These results indicated that the infection of C. campestris may reduce the activity of PSⅡ photochemistry of the host M. micrantha, which would influence the host photosynthesis.
国家科技期刊平台
NSTL
万方数据
维普
