Effects of slight shading in summer on the leaf senescence and endogenous hormone and polyamine contents in herbaceous peony.

Over time, the net leaf photosynthetic rate of all tested materials under the SS and SL treatments showed a decreasing trend (Fig. 5 B).

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The IAA content of the wild species under the SL treatment showed an increasing trend.

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From June 20 to September 19, under the SS and SL treatments, the leaf chlorophyll contents of ‘Zifengyu’ and ‘Hongfengyu’ showed an overall trend of first decreasing and then increasing, whereas the leaf chlorophyll content of the wild species showed a bimodal trend.

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