ROUGH SHEATH2: a Myb protein that represses knox homeobox genes in maize lateral organ primordia.
basic_science · Level V
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Abstract
The regulation of members of the knotted1-like homeobox (knox) gene family is required for the normal initiation and development of lateral organs. The maize rough sheath2 (rs2) gene, which encodes a Myb-domain protein, is expressed in lateral organ primordia and their initials. Mutations in the rs2 gene permit ectopic expression of knox genes in leaf and floral primordia, causing a variety of developmental defects. Ectopic KNOX protein accumulation in rs2 mutants occurs in a subset of the normal rs2-expressing cells. This variegated accumulation of KNOX proteins in rs2 mutants suggests that rs2 represses knox expression through epigenetic means.
Medical subject headings
- Gene Expression Regulation, Plant
- Genes, Homeobox
- Homeodomain Proteins
- Proto-Oncogene Proteins c-myb
- Repressor Proteins
- Zea mays