Photosynthetica 2022, 60(1):70-78 | DOI: 10.32615/ps.2021.062
Exposed red leaves display adaptive adjustments in chlorophyll and photosystem ratios compatible with the shade imposed by anthocyanin accumulation
- Laboratory of Plant Physiology, Department of Biology, University of Patras, Patras GR-26504, Greece
Foliar anthocyanins shape a peculiar shade in a red leaf's interior leading to uneven energy distribution between the two photosystems. Accordingly, a readjustment of PSII/PSI stoichiometry could restore excitation balance. To test this hypothesis, 77 K fluorescence emission spectra of thylakoids from green and red leaves of seven species with different pigment profiles were compared. The ratio of F686/F736 served as an indication of the PSII/PSI functional ratio. To avoid possible species-dependent differences in the measured parameters, plants showing intra-individual, intra-species, or intra-leaf variation in the expression of the anthocyanic character were used. Red leaves or red leaf areas displayed higher PSII/PSI ratio, irrespectively of species and anthocyanin accumulation pattern. PSII/PSI ratio declined in parallel with anthocyanin decrease. In five species, red leaves displayed also a lower Chl a/b ratio. We conclude that red leaves growing in full sunlight develop adaptive adjustments in their chlorophyll and photosystem ratios, compatible with the shade-acclimation syndrome.
Additional key words: fluorescence emission spectra; foliar anthocyanins; photosystem ratio; shade-acclimation syndrome.
Received: October 6, 2021; Revised: November 22, 2021; Accepted: December 1, 2021; Prepublished online: January 13, 2022; Published: March 18, 2022 Show citation
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