RRC ID 5843
Author Whipple CJ, Hall DH, DeBlasio S, Taguchi-Shiobara F, Schmidt RJ, Jackson DP.
Title A conserved mechanism of bract suppression in the grass family.
Journal Plant Cell
Abstract Suppression of inflorescence leaf, or bract, growth has evolved multiple times in diverse angiosperm lineages, including the Poaceae and Brassicaceae. Studies of Arabidopsis thaliana mutants have revealed several genes involved in bract suppression, but it is not known if these genes play a similar role in other plants with suppressed bracts. We identified maize (Zea mays) tassel sheath (tsh) mutants, characterized by the loss of bract suppression, that comprise five loci (tsh1-tsh5). We used map-based cloning to identify Tsh1 and found that it encodes a GATA zinc-finger protein, a close homolog of HANABA TARANU (HAN) of Arabidopsis. The bract suppression function of Tsh1 is conserved throughout the grass family, as we demonstrate that the rice (Oryza sativa) NECK LEAF1 (NL1) and barley (Hordeum vulgare) THIRD OUTER GLUME (TRD) genes are orthologous with Tsh1. Interestingly, NL1/Tsh1/TRD expression and function are not conserved with HAN. The existence of paralogous NL1/Tsh1/TRD-like genes in the grasses indicates that the NL1/Tsh1/TRD lineage was created by recent duplications that may have facilitated its neofunctionalization. A comparison with the Arabidopsis genes regulating bract suppression further supports the hypothesis that the convergent evolution of bract suppression in the Poaceae involved recruitment of a distinct genetic pathway.
Volume 22(3)
Pages 565-78
Published 2010-3
DOI 10.1105/tpc.109.073536
PII tpc.109.073536
PMID 20305121
PMC PMC2861461
MeSH Amino Acid Sequence Arabidopsis / genetics Cloning, Molecular Evolution, Molecular* Gene Expression Regulation, Plant Genes, Plant Hordeum / genetics Models, Genetic Molecular Sequence Data Oryza / genetics Phylogeny Plant Leaves / genetics Plant Leaves / growth & development* Plant Proteins / genetics* Plant Proteins / metabolism Sequence Alignment Zea mays / genetics* Zea mays / growth & development
IF 8.631
Times Cited 37