Photosynthetica 2023, 61(2):138-147 | DOI: 10.32615/ps.2022.036

Influence of phytochromes on microRNA expression, phenotype, and photosynthetic activity in A. thaliana phy mutants under light with different spectral composition

P. PASHKOVSKIY1, V. KRESLAVSKI2, A. KHUDYAKOVA2, A. KOSOBRYUKHOV2, Vl.V. KUZNETSOV1, S.I. ALLAKHVERDIEV1
1 K.A. Timiryazev Institute of Plant Physiology, Russian Academy of Sciences, Botanicheskaya Street 35, 127276 Moscow, Russia
2 Institute of Basic Biological Problems, Russian Academy of Sciences, Institutskaya Street 2, Pushchino, 142290 Moscow Region, Russia

Light-induced changes in miRNAs, morphogenesis, and photosynthetic processes in phytochrome-deficient mutant plants grown under different light qualities were studied. miRNA activity in many processes is regulated by phytochromes and phytochrome-interacting factors (PIFs). The reduced content of photoreceptors in phytochrome mutants affects the PIF-microRNA interaction. In plants grown under red light (RL) and white light (WL), the phenotype of phyb mutant was distorted; however, under blue light (BL) conditions, the phyb phenotype was normalized. The photosynthetic rates of both the mutants and wild type were higher under BL than under RL and WL. The expression of most studied miRNAs increased in phyaphyb mutants under BL conditions, which is probably one of the reasons for the normalization of the phenotype, the increase in PSII activity, and the photosynthetic rate. MicroRNAs under BL can partially improve photosynthesis and phenotype of the mutants, which indicates the conjugation of the functioning of phytochromes in miRNA formation.

Additional key words: Arabidopsis thaliana phytochrome mutants; microRNA; photomorphogenesis; photosynthesis.

Received: June 28, 2022; Revised: July 25, 2022; Accepted: July 28, 2022; Prepublished online: August 25, 2022; Published: June 6, 2023  Show citation

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PASHKOVSKIY, P., KRESLAVSKI, V., KHUDYAKOVA, A., KOSOBRYUKHOV, A., KUZNETSOV, V.V., & ALLAKHVERDIEV, S.I. (2023). Influence of phytochromes on microRNA expression, phenotype, and photosynthetic activity in A. thaliana phy mutants under light with different spectral composition. Photosynthetica, 61(SPECIAL ISSUE 2023/1), 138-147. doi: 10.32615/ps.2022.036
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