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Auxin signaling modules regulate maize inflorescence architecture
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Journal Article
Auxin signaling modules regulate maize inflorescence architecture
2015
Overview
In plants, small groups of pluripotent stem cells called axillary meristems are required for the formation of the branches and flowers that eventually establish shoot architecture and drive reproductive success. To ensure the proper formation of new axillary meristems, the specification of boundary regions is required for coordinating their development. We have identified two maize genes,BARREN INFLORESCENCE1andBARREN INFLORESCENCE4(BIF1andBIF4), that regulate the early steps required for inflorescence formation.BIF1andBIF4encode AUXIN/INDOLE-3-ACETIC ACID (Aux/IAA) proteins, which are key components of the auxin hormone signaling pathway that is essential for organogenesis. Here we show that BIF1 and BIF4 are integral to auxin signaling modules that dynamically regulate the expression of BARREN STALK1 (BA1), a basic helix-loop-helix (bHLH) transcriptional regulator necessary for axillary meristem formation that shows a striking boundary expression pattern. These findings suggest that auxin signaling directly controls boundary domains during axillary meristem formation and define a fundamental mechanism that regulates inflorescence architecture in one of the most widely grown crop species.
Publisher
National Academy of Sciences,National Acad Sciences
Subject
/ Corn
/ Electrophoretic Mobility Shift Assay
/ Flowers - growth & development
/ Gene Expression Regulation, Developmental - genetics
/ Gene Expression Regulation, Developmental - physiology
/ Gene Expression Regulation, Plant - genetics
/ Gene Expression Regulation, Plant - physiology
/ Genetics
/ Hormones
/ Indoleacetic Acids - metabolism
/ Meristem - growth & development
/ Real-Time Polymerase Chain Reaction
/ Signal Transduction - physiology
/ Zea mays
