DWARF10, an RMS1/MAX4/DAD1 ortholog, controls lateral bud outgrowth in rice

Tomotsugu Arite, Hirotaka Iwata, Kenji Ohshima, Masahiko Maekawa, Masatoshi Nakajima, Mikiko Kojima, Hitoshi Sakakibara, Junko Kyozuka

Research output: Contribution to journalArticlepeer-review

378 Citations (Scopus)

Abstract

Plant architecture is mostly determined by shoot branching patterns. Apical dominance is a well-known control mechanism in the development of branching patterns, but little is known regarding its role in monocots such as rice. Here, we show that the concept of apical dominance can be applied to tiller bud outgrowth of rice. In dwarf10 (d10), an enhanced branching mutant of rice, apical dominance can be observed, but the inhibitory effects of the apical meristem was reduced. D10 is a rice ortholog of MAX4/RMS1/DAD1 that encodes a carotenoid cleavage dioxygenase 8 and is supposed to be involved in the synthesis of an unidentified inhibitor of shoot branching. D10 expression predominantly occurs in vascular cells in most organs. Real-time polymerase chain reaction analysis revealed that accumulation of D10 mRNA is induced by exogenous auxin. Moreover, D10 expression is upregulated in six branching mutants, d3, d10, d14, d17, d27 and high tillering dwarf (htd1). No such effects were found for D3 or HTD1, the MAX2 and MAX3 orthologs, respectively, of rice. These findings imply that D10 transcription might be a critical step in the regulation of the branching inhibitor pathway. In addition, we present observations that suggest that FINE CULM1 (FC1), a rice ortholog of teosinte branched 1 (tb1), possibly works independently of the branching inhibitor pathway.

Original languageEnglish
Pages (from-to)1019-1029
Number of pages11
JournalPlant Journal
Volume51
Issue number6
DOIs
Publication statusPublished - 2007 Sep 1
Externally publishedYes

Keywords

  • Auxin
  • D10
  • Feedback control
  • Rice
  • Shoot branching

ASJC Scopus subject areas

  • Genetics
  • Plant Science
  • Cell Biology

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