Biochemical and photosystem characteristics of wild-type and Chl b-deficient mutant in tree peony (Paeonia suffruticosa)

In order to explore the adaptive strategies of tree peony yl1 mutant in response photooxidative stress, changes biochemical parameters, chlorophyll fluorescence, and modulated 820-nm reflection wild-type plants were compared. We found activities superoxide dismutase catalase, contents soluble protein, proline, radicals, hydrogen peroxide, malondialdehyde, relative electrical conductivity significantly higher than those wild type. The photochemical efficiency PSII decreased, while proportion heat dissipation increased greatly. donor acceptor side electron transfer greatly inhibited. Meanwhile, performance PSI coordination two photosystems decreased markedly mutant. could reduce damage caused by stress increasing activity antioxidant enzymes, content some osmoregulatory substances, dissipation.