BIG BROTHER Uncouples Cell Proliferation from Elongation in the Arabidopsis Primary Root.

ABSTRACT: Plant organ size is sensitive to environmental conditions, but is also limited by hardwired genetic constraints. In Arabidopsis, a few organ size regulators have been identified. Among them, the BIG BROTHER (BB) gene has a prominent role in the determination of flower organ and leaf size. BB loss-of-function mutations result in a prolonged proliferation phase during leaf(-like) organ formation, and consequently larger leaves, petals and sepals. Whether BB has a similar role in root growth is unknown. Here we describe a novel bb allele which carries a P235L point mutation in the BB RING finger domain. This allele behaves similarly to described bb loss-of-function alleles and displays increased root meristem size due to a higher number of dividing, meristematic cells. In contrast, mature cel

SUBMITTER: Cattaneo P 

PROVIDER: S-EPMC5914324 | biostudies-literature | 2017 Sep

REPOSITORIES: biostudies-literature