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Histochemical localization of catechin and flavonol in Huangjinya leaves. a, b, c, d show the normal green leaves of Huangjinya shaded with 60% (NG); e, f, g, h show the chlorotic leaves of HJY exposed to 100% sunlight (EM); b and f show staining with vanillin-HCl reagent; the red signal represents phenolic compounds (mainly catechins; d and h were stained with NaturstoVreagenz A (confocal laser scanning microscopy), and the green fluorescence signal represents flavonol
