期刊
PLANT JOURNAL
卷 65, 期 4, 页码 571-577出版社
WILEY
DOI: 10.1111/j.1365-313X.2010.04443.x
关键词
apical dominance; auxin transport; bud outgrowth; canalization; pea; PIN1 immunolocalization
资金
- Czech Ministry of Education [LC06034, MSM0021622415]
- Czech Science Foundation [522/02/D137]
- Grant Agency of the Academy of Sciences of the Czech Republic [IAA601630703]
- Research Foundation Flanders
P>Shoot branching is one of the major determinants of plant architecture. Polar auxin transport in stems is necessary for the control of bud outgrowth by a dominant apex. Here, we show that following decapitation in pea (Pisum sativum L.), the axillary buds establish directional auxin export by subcellular polarization of PIN auxin transporters. Apical auxin application on the decapitated stem prevents this PIN polarization and canalization of laterally applied auxin. These results support a model in which the apical and lateral auxin sources compete for primary channels of auxin transport in the stem to control the outgrowth of axillary buds.
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