Abscisic acid signaling is controlled by a BRANCHED1/HD-ZIP I cascade in Arabidopsis axillary buds

Shoot-branching patterns determine key aspects of plant life and are important targets for crop breeding. However, we are still largely ignorant of the genetic networks controlling locally themost important decision during branch development: whether the axillary bud, or branch primordium, grows out...

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Published inProceedings of the National Academy of Sciences - PNAS Vol. 114; no. 2; pp. E245 - E254
Main Authors González-Grandío, Eduardo, Pajoro, Alice, Franco-Zorrilla, José M., Tarancón, Carlos, Immink, Richard G. H., Cubas, Pilar
Format Journal Article
LanguageEnglish
Published United States National Academy of Sciences 10.01.2017
SeriesPNAS Plus
Subjects
Abscisic acid
Arabidopsis
Biological Sciences
Bud dormancy
Flowers & plants
Gene expression
HD-ZIP proteins
Hormones
PNAS Plus
Signal transduction
TCP proteins
Transcription factors
abscisic acid
HD-ZIP proteins
TCP proteins
bud dormancy
Arabidopsis
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Summary:Shoot-branching patterns determine key aspects of plant life and are important targets for crop breeding. However, we are still largely ignorant of the genetic networks controlling locally themost important decision during branch development: whether the axillary bud, or branch primordium, grows out to give a lateral shoot or remains dormant. Here we show that, inside the buds, the TEOSINTE BRANCHED1, CYCLOIDEA, PCF (TCP) transcription factor BRANCHED1 (BRC1) binds to and positively regulates the transcription of three related Homeodomain leucine zipper protein (HD-ZIP)-encoding genes: HOMEOBOX PROTEIN 21 (HB21), HOMEOBOX PROTEIN 40 (HB40), and HOMEOBOX PROTEIN 53 (HB53). These three genes, together with BRC1, enhance 9-CIS-EPOXICAROTENOID DIOXIGENASE 3 (NCED3) expression, lead to abscisic acid accumulation, and trigger hormone response, thus causing suppression of bud development. This TCP/HD-ZIP genetic module seems to be conserved in dicot and monocotyledonous species to prevent branching under light-limiting conditions.
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Author contributions: E.G.-G. and P.C. designed research; R.G.H.I. supervised research; E.G.-G., A.P., and P.C. performed research; J.M.F.-Z. and R.G.H.I. contributed new reagents/analytic tools; E.G.-G., J.M.F.-Z., C.T., and P.C. analyzed data; and E.G.-G. and P.C. wrote the paper.
Edited by Ottoline Leyser, University of Cambridge, Cambridge, United Kingdom, and approved November 22, 2016 (received for review August 8, 2016)
ISSN:0027-8424
1091-6490
DOI:10.1073/pnas.1613199114