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Journal Articles Journal of Plant Interactions Year : 2021

Transcriptional regulation of plant sugar transporter genes by beneficial rhizobacteria

Abstract

The initial greening of angiosperm occurs upon light-activation of photoreceptors that trigger photomorphogenesis followed with the development of chloroplasts. In these semi-autonomous organelles, the construction of the photosynthetic apparatus depends on the coordination of nuclear and plastid gene expression. Here we show that PAP8, as an essential subunit of the plastid-encoded RNA polymerase, is under the control of a regulatory element recognized by the photomorphogenic factor HY5. PAP8 is localized and active in both plastids and the nucleus and particularly essential for the formation of late photobodies. In the albino pap8 mutant, phytochrome-mediated signalling is altered, PIFs are maintained, HY5 is not stabilized, and GLK1 expression is impaired. PAP8 translocates into plastids losing its pre-sequence, interacts with the PEP, and using an unknown route or a retrograde transport, reaches the nucleus where it has the ability to interact with pTAC12/HMR/PAP5. Since PAP8 is required for the phytochrome-B-mediated signalling cascade and the reshaping of the PEP, it may coordinate nuclear gene expression with the PEP-driven chloroplastic gene expression during chloroplast biogenesis.
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hal-03383043 , version 1 (17-03-2023)

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Antoine Desrut, Florence Thibault, Pierre Coutos-Thévenot, Jesús Mercado-Blanco, Cécile Vriet. Transcriptional regulation of plant sugar transporter genes by beneficial rhizobacteria. Journal of Plant Interactions, 2021, 16 (1), pp.443-451. ⟨10.1080/17429145.2021.1974582⟩. ⟨hal-03383043⟩
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