期刊名称：Proceedings of the National Academy of Sciences
印刷版ISSN：0027-8424
电子版ISSN：1091-6490
出版年度：2017
卷号：114
期号：2
页码：E245-E254
DOI：10.1073/pnas.1613199114
语种：English
出版社：The National Academy of Sciences of the United States of America
摘要：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 the most 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.
