Circadian rhythms are associated with variation in photosystem II function and photoprotective mechanisms

• DOI: 10.1111/pce.13216
• Publication Date: 2018-04-17T09:32:07Z
• Authors: Yulia Yarkhunova; Carmela R. Guadagno; Matthew J. Rubin; Seth J. Davis; Brent E. Ewers; Cynthia Weinig
• Keywords: Variation (astronomy)

Abstract The circadian clock regulates many aspects of leaf gas supply and biochemical demand for CO 2 , is hypothesized to improve plant performance. Yet the extent which may regulate efficiency photosystem II (PSII) photoprotective mechanisms such as heat dissipation less explored. Based on measurements chlorophyll a fluorescence, we estimated maximum PSII in light ( Fv′/Fm′ ) by nonphotochemical quenching NPQ ). We further dissected total into its main components, qE (pH‐dependent quenching), qT (state‐transition qI (quenching related photoinhibition), mutant genotypes Arabidopsis thaliana cognate wild‐type genotypes, panel recombinant inbred lines expressing quantitative variation period. Compared with mutants altered function, observed that period lengths approximately 24 hr had both higher levels indicative improved reduced suggestive lower stress harvesting complexes. In lines, genetic variances were significant all 3 components explaining greatest proportion . Bivariate tests association structural equation models hierarchical trait relationships showed was empirically associated mediating relationship exchange. results demonstrate segregating suggest adaptive significance partly derive from regulation reactions photosynthesis mechanisms.