ATHB4, a regulator of shade avoidance, modulates hormone response in Arabidopsis seedlings

Plant Journal - Tập 59 Số 2 - Trang 266-277 - 2009
Céline Sorin1,2,3, Mercè Salla‐Martret1,2, Jordi Bou‐Torrent1, Irma Roig‐Villanova1,3, Jaime F. Martínez‐García1,4,5
1Center for Research in Agricultural Genomics (CRAG) CSIC-IRTA-UAB, c. Jordi Girona, 18-26, 08034-Barcelona, Spain
2These authors contributed equally to this paper
3‡Current address, UNIMI, I-20133 Milan, Italy.
4Institució Catalana de Recerca i Estudis Avançats, Passeig Lluís Companys 23, 08010-Barcelona, Spain
5†Current address, Institut des sciences du Végétal – CNRS, 91198 Gif-sur-Yvette cedex, France.

Tóm tắt

SummaryPlants sense the presence of competing neighboring vegetation as a change in light quality: i.e. they sense the reduced ratio of red light to far‐red light. The responses to shade are generally referred to as the shade avoidance syndrome (SAS), and involve various developmental changes intended to outgrow or outcompete the neighboring plants. Here, we analyze the function of ATHB4, a gene encoding a homeodomain‐leucine zipper (HD‐Zip) class‐II transcription factor from Arabidopsis thaliana, the expression of which is rapidly and directly upregulated after proximity perception by the phytochrome photoreceptors. ATHB4 acts redundantly with other members of the HD‐Zip class‐II transcription factors. The expression of these genes is regulated by other members of the same class, forming a small transcriptional network of factors in which homeostasis is mutually controlled. Our results suggest that some members of this small gene subfamily can modulate SAS responses by controlling auxin, brassinosteroid and gibberellin molecular and/or physiological responsiveness. In particular, we propose ATHB4 as a new shade signaling component that participates in integrating shade perception and hormone‐mediated growth.

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Plant Journal

Tập 59 Số 2

266-277

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