Developmental regulation and downstream effects of the knox class homeobox genes Oskn2 and Oskn3 from rice

Plant Molecular Biology
A D Postma-HaarsmaAnnemarie H Meijer

Abstract

Plant homeobox genes of the class 1 knox (knotted1-like) type are involved in the regulation of shoot apical meristem formation and function. Their expression generally occurs either throughout the meristem or specifically at the lateral organ boundaries. Down-regulation in the organ primordia is tightly controlled and misexpression in leaves leads to a perturbed development. Here, the transcriptional control of two rice knox genes, Oskn2 and Oskn3, was addressed, showing that the promoter sequences of both genes mediate the initial down-regulation during lateral organ formation, but are insufficient to keep expression in lateral organs stably off. Therefore, maintenance of the repressed state requires control elements outside the promoter regions. Ectopic expression of Oskn2 or Oskn3 induced similar defects in panicle branching. internode elongation and leaf patterning. However, small differences suggested that their target gene specificities are not completely overlapping. This was supported by the observation that Oskn3 protein but not Oskn2 could interact with two reported recognition sequences of a KNOX protein from barley. Finally, protein-protein interactions may contribute to the functioning of KNOX proteins, as the abi...Continue Reading

Citations

Sep 26, 2007·Genome Génome / Conseil National De Recherches Canada·Zengke LuoGuanghua He
Nov 1, 2004·The New Phytologist·Enrico Scarpella, Annemarie H Meijer
Sep 16, 2003·Current Opinion in Plant Biology·James Z Zhang

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