BELL1-like homeobox genes regulate inflorescence architecture and meristem maintenance in rice

Takuyuki Ikeda, Wakana Tanaka, Taiyo Toriba, Chie Suzuki, Akiteru Maeno, Katsutoshi Tsuda, Toshihiko Shiroishi, Tetsuya Kurata, Tomoaki Sakamoto, Masayuki Murai, Hiroaki Matsusaka, Toshihiro Kumamaru, Hiro Yuki Hirano

Research output: Contribution to journalArticle

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.

Original languageEnglish
Pages (from-to)465-478
Number of pages14
JournalPlant Journal
Volume98
Issue number3
DOIs
Publication statusPublished - May 1 2019

Fingerprint

Inflorescence
homeotic genes
Meristem
Homeobox Genes
meristems
branches
inflorescences
phyllotaxy
Maintenance
rice
mutants
Angiosperms
flowers
Homozygote
Arabidopsis
shoot meristems
apical meristems
Embryonic Development
homozygosity
Oryza

All Science Journal Classification (ASJC) codes

  • Genetics
  • Plant Science
  • Cell Biology

Cite this

Ikeda, T., Tanaka, W., Toriba, T., Suzuki, C., Maeno, A., Tsuda, K., ... Hirano, H. Y. (2019). BELL1-like homeobox genes regulate inflorescence architecture and meristem maintenance in rice. Plant Journal, 98(3), 465-478. https://doi.org/10.1111/tpj.14230

BELL1-like homeobox genes regulate inflorescence architecture and meristem maintenance in rice. / Ikeda, Takuyuki; Tanaka, Wakana; Toriba, Taiyo; Suzuki, Chie; Maeno, Akiteru; Tsuda, Katsutoshi; Shiroishi, Toshihiko; Kurata, Tetsuya; Sakamoto, Tomoaki; Murai, Masayuki; Matsusaka, Hiroaki; Kumamaru, Toshihiro; Hirano, Hiro Yuki.

In: Plant Journal, Vol. 98, No. 3, 01.05.2019, p. 465-478.

Research output: Contribution to journalArticle

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 2019, 'BELL1-like homeobox genes regulate inflorescence architecture and meristem maintenance in rice', Plant Journal, vol. 98, no. 3, pp. 465-478. https://doi.org/10.1111/tpj.14230
Ikeda, Takuyuki ; Tanaka, Wakana ; Toriba, Taiyo ; Suzuki, Chie ; Maeno, Akiteru ; Tsuda, Katsutoshi ; Shiroishi, Toshihiko ; Kurata, Tetsuya ; Sakamoto, Tomoaki ; Murai, Masayuki ; Matsusaka, Hiroaki ; Kumamaru, Toshihiro ; Hirano, Hiro Yuki. / BELL1-like homeobox genes regulate inflorescence architecture and meristem maintenance in rice. In: Plant Journal. 2019 ; Vol. 98, No. 3. pp. 465-478.
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