Leaf color change and photosystem function evaluation under heat treatment revealed the stress resistance variation between <i>Loropetalum chinense</i> and <i>L. chinense</i> var. <i>rubrum</i>.

Among them, temperature, especially high temperature showed extremely significant effects on leaf morphology and physiology.

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However, there was also research showed that plants usually showed a trend of decrease in chlorophyll under heat stress, thus turned leaves into yellow and influenced the absorption and utilization of light energy of leaves ( Dutta, Mohanty & Tripathy, 2009 ).

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On contrary to chlorophyll b, anthocyanin showed a significant trend of decrease in H and F, on the seventh day of heat treatment, it decreased 32% and 88%, respectively.

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