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

Eduardo Gonzalez-Grandio, Alice Pajoro, Jose M. Franco-Zorrilla, Carlos Tarancon, Richard G.H. Immink, Pilar Cubas*

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

77 Citations (Scopus)

Abstract

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.
Original languageEnglish
Pages (from-to)E245-E254
JournalProceedings of the National Academy of Sciences of the United States of America
Volume114
Issue number2
DOIs
Publication statusPublished - 2017

Keywords

  • Abscisic acid
  • Arabidopsis
  • Bud dormancy
  • HD-ZIP proteins
  • TCP proteins

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