OEE1 affects the tobacco photosynthesis through the hormone regulation

Le résumé fourni par la source

The Oxygen-Evolution Enhancer Protein 1 (OEE1), also known as Photosystem II Protein O (PsbO), is an important extrinsic subunit of photosystem II. However, understanding of the mechanism by which it affects plant growth and development in tobacco is limited. In this study, we first demonstrated that OEE1, which is mainly chloroplast-localized, was conserved in tobacco ( Nicotiana tabacum ) and expressed at high levels in leaves and leaf veins. The loss of function of OEE1 resulted in a defective plant growth phenotype, characterized by decreased plant height, narrower leaf angle and low photosynthetic efficiency. However, the overexpression line could complement this phenotype. Subsequent transcriptome analysis revealed differentially expressed genes (DEGs) in WT plants and oee1 mutants, with DEGs being enriched in cellular, hormone metabolic and photosynthetic pathways. Further analysis confirmed that the contents of endogenous hormones and chemical compositions, including amino acids, sugars, polyphenols and organic acids, were changed in the absence of OEE1 . In conclusion, the results demonstrate that OEE1 regulates the photosynthesis pathway, which affects the endogenous metabolites and plant growth/development in a hormone-dependent manner in tobacco.

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