Hormonal Regulation of Branching in Grasses

The author responsible for distribution of materials integral to the findings presented in this article in accordance with the policy described in the Instructions for Authors is: Paula McSteen. Some figures in this article are displayed in color online but in black and white in the print edition

Paula McSteen

2009

Scholarcy highlights

  • Hormones play a critical role in regulating branching
  • Many genes have been identified that regulate axillary meristem initiation and outgrowth during vegetative and reproductive development
  • Recent work in maize and rice suggests that the role of auxin transport and auxin biosynthesis in axillary meristem initiation is conserved in monocots
  • Double mutant combinations between ba1 and tb1 produced no tillers, indicating that BARREN STALK1 is required for axillary meristem initiation during vegetative development. bif2;tb1 and spi1;tb1 double mutants produced fewer tillers than tb1 single mutants, indicating that they too function in axillary meristem initiation
  • Plants containing a knockout of multiple YUC genes have a bushy appearance due to reduced apical dominance. These differences could be due to genetic redundancy, but it is interesting that the initiation of vegetative axillary meristems in Arabidopsis does not appear to be as sensitive to reductions in auxin biosynthesis or transport as in maize
  • A novel compound required for regulation of branching was proposed based on the identification of the more axillary meristem mutants in Arabidopsis, ramosus mutants in pea, and decreased apical dominance mutants in petunia
  • Extensive analysis of BRC1 interactions showed that BRC1 acts as an integrator of hormonal and environmental signals to regulate whether or not a branch grows out

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