RRC ID 54957
Author Ikeda T, Tanaka W, Toriba T, Suzuki C, Maeno A, Tsuda K, Shiroishi T, Kurata T, Sakamoto T, Murai M, Matsusaka H, Kumamaru T, Hirano HY.
Title BELL1-like homeobox genes regulate inflorescence architecture and meristem maintenance in rice.
Journal Plant J
Abstract Inflorescence architecture is diverse in angiosperms, and is mainly determined by the arrangement of the branches and flowers, known as phyllotaxy. In rice (Oryza sativa), the main inflorescence axis, called the rachis, generates primary branches in a spiral phyllotaxy, and flowers (spikelets) are formed on these branches. Here, we have studied a classical mutant, named verticillate rachis (ri), which produces branches in a partially whorled phyllotaxy. Gene isolation revealed that RI encodes a BELL1-type homeodomain transcription factor, similar to Arabidopsis PENNYWISE/BELLRINGER/REPLUMLESS, and is expressed in the specific regions within the inflorescence and branch meristems where their descendant meristems would soon initiate. Genetic combination of an ri homozygote and a mutant allele of RI-LIKE1 (RIL1) (designated ri ril1/+ plant), a close paralog of RI, enhanced the ri inflorescence phenotype, including the abnormalities in branch phyllotaxy and rachis internode patterning. During early inflorescence development, the timing and arrangement of primary branch meristem (pBM) initiation were disturbed in both ri and ri ril1/+ plants. These findings suggest that RI and RIL1 were involved in regulating the phyllotactic pattern of the pBMs to form normal inflorescences. In addition, both RI and RIL1 seem to be involved in meristem maintenance, because the ri ril1 double-mutant failed to establish or maintain the shoot apical meristem during embryogenesis.
Volume 98(3)
Pages 465-478
Published 2019-5-1
DOI 10.1111/tpj.14230
PMID 30657229
MeSH Gene Expression Regulation, Plant Inflorescence / embryology* Inflorescence / genetics Inflorescence / metabolism* Meristem / embryology* Meristem / genetics Meristem / metabolism* Oryza / embryology* Oryza / genetics Oryza / metabolism* Plant Proteins / genetics Plant Proteins / metabolism*
IF 5.726
Times Cited 2
Rice Induced mutation line