EFFECTS OF ANTHOCYANINS ON FUNCTIONS OF PHOTOSYNTHESIS SYSTEM IN THREE SYRINGA LEAVES UNDER LOW LIGHT CONDITIONS

In this study, taking Syringa oblata Iandl (SI), Syringa oblata var. affinis Lingelsh (SL) and Syringa chinensis (SC) as the test material, the functional role of anthocyanins in photosynthetic apparatus in leaves of three varieties under different light conditions were investigated. In the low light, P-n, G(s) and T-r values of Syringa leaves decreased. Meanwhile, minimal fluorescence (F-o), maximum fluorescence (F-m) and absorption flux per reaction center (ABSIRC) in young leaves of SI was lower than those of SL and SC, which indicated that anthocyanins could reduce the absorption of light in Syringa leaves. Furthermore, the parameters of PSII photochemical efficiency (F-v/F-m), PSII potential activities (F-v/F-o), electron transport rate (ETR) and actual photochemical efficiency (Phi(PSII)) of SI was higher than that of SL and SC in low light, respectively. The number of PSII reactive center, ABS/RC, maximal trapped energy flux per reaction center (TRo/RC), electron transport flux per reaction center (ETo/RC) and dissipated energy flux per reaction center (DIo/RC) of SL and SC were significantly higher those of SI in low light, while the proportion of inactivation of reactive center in SL and SC were higher than others in low light.

Automated summary

This study investigated the functional role of anthocyanins in the photosynthetic apparatus of leaves from Syringa oblata, Syringa oblata var. affinis Lingelsh, and Syringa chinensis under different light conditions. The results showed that anthocyanins could reduce light absorption in Syringa leaves, and the photosynthetic efficiency of Syringa oblata was higher than that of the other two varieties under low light conditions.