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Research article2012Peer reviewedOpen access

Phytochrome interacting factors 4 and 5 control seedling growth in changing light conditions by directly controlling auxin signaling

Hornitschek, Patricia; Kohnen, Markus V.; Lorrain, Severine; Rougemont, Jacques; Ljung, Karin; Lopez-Vidriero, Irene; Franco-Zorrilla, Jose M.; Solano, Roberto; Trevisan, Martine; Pradervand, Sylvain; Xenarios, Ioannis; Frankhauser, Christian

Abstract

Plant growth is strongly influenced by the presence of neighbors that compete for light resources. In response to vegetational shading shade-intolerant plants such as Arabidopsis display a suite of developmental responses known as the shade-avoidance syndrome (SAS). The phytochrome B (phyB) photoreceptor is the major light sensor to mediate this adaptive response. Control of the SAS occurs in part with phyB, which controls protein abundance of phytochrome-interacting factors 4 and 5 (PIF4 and PIF5) directly. The shade-avoidance response also requires rapid biosynthesis of auxin and its transport to promote elongation growth. The identification of genome-wide PIF5-binding sites during shade avoidance revealed that this bHLH transcription factor regulates the expression of a subset of previously identified SAS genes. Moreover our study suggests that PIF4 and PIF5 regulate elongation growth by controlling directly the expression of genes that code for auxin biosynthesis and auxin signaling components.

Keywords

shade avoidance; phytochrome; phytochrome-interacting factor; auxin; ChIP sequencing; Arabidopsis thaliana

Published in

Plant Journal
2012, Volume: 71, number: 5, pages: 699-711
Publisher: WILEY-BLACKWELL

    UKÄ Subject classification

    Developmental Biology

    Publication identifier

    DOI: https://doi.org/10.1111/j.1365-313X.2012.05033.x

    Permanent link to this page (URI)

    https://res.slu.se/id/publ/41646