RRC ID 3666
Author Kawakatsu T, Itoh J, Miyoshi K, Kurata N, Alvarez N, Veit B, Nagato Y.
Title PLASTOCHRON2 regulates leaf initiation and maturation in rice.
Journal Plant Cell
Abstract In higher plants, leaves initiate in constant spatial and temporal patterns. Although the pattern of leaf initiation is a key element of plant shoot architecture, little is known about how the time interval between initiation events, termed plastochron, is regulated. Here, we present a detailed analysis of plastochron2 (pla2), a rice (Oryza sativa) mutant that exhibits shortened plastochron and precocious maturation of leaves during the vegetative phase and ectopic shoot formation during the reproductive phase. The corresponding PLA2 gene is revealed to be an orthologue of terminal ear1, a maize (Zea mays) gene that encodes a MEI2-like RNA binding protein. PLA2 is expressed predominantly in young leaf primordia. We show that PLA2 normally acts to retard the rate of leaf maturation but does so independently of PLA1, which encodes a member of the P450 family. Based on these analyses, we propose a model in which plastochron is determined by signals from immature leaves that act non-cell-autonomously in the shoot apical meristem to inhibit the initiation of new leaves.
Volume 18(3)
Pages 612-25
Published 2006-3
DOI 10.1105/tpc.105.037622
PII tpc.105.037622
PMID 16461585
PMC PMC1383637
MeSH Amino Acid Sequence Cloning, Molecular Genes, Plant Meristem / metabolism Models, Biological Molecular Sequence Data Mutation Oryza / anatomy & histology Oryza / growth & development* Oryza / metabolism Phenotype Phylogeny Plant Leaves / anatomy & histology Plant Leaves / growth & development Plant Leaves / metabolism Plant Proteins / genetics Plant Proteins / metabolism Plant Proteins / physiology* Plant Stems / anatomy & histology Plant Stems / growth & development Plant Stems / metabolism RNA-Binding Proteins / genetics RNA-Binding Proteins / metabolism RNA-Binding Proteins / physiology* Reproduction Sequence Homology, Amino Acid
IF 8.228
Times Cited 51
Rice Induced Mutation Lines