Journal Article

<i>d14</i>, a Strigolactone-Insensitive Mutant of Rice, Shows an Accelerated Outgrowth of Tillers

Tomotsugu Arite, Mikihisa Umehara, Shinji Ishikawa, Atsushi Hanada, Masahiko Maekawa, Shinjiro Yamaguchi and Junko Kyozuka

in Plant and Cell Physiology

Published on behalf of Japanese Society of Plant Physiologists

Volume 50, issue 8, pages 1416-1424
Published in print August 2009 | ISSN: 0032-0781
Published online June 2009 | e-ISSN: 1471-9053 | DOI: http://dx.doi.org/10.1093/pcp/pcp091
d14, a Strigolactone-Insensitive Mutant of Rice, Shows an Accelerated Outgrowth of Tillers

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  • Biochemistry
  • Molecular and Cell Biology
  • Plant Sciences and Forestry

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Recent studies using highly branched mutants of pea, Arabidopsis and rice have demonstrated that strigolactones, a group of terpenoid lactones, act as a new hormone class, or its biosynthetic precursors, in inhibiting shoot branching. Here, we provide evidence that DWARF14 (D14) inhibits rice tillering and may act as a new compo-nent of the strigolactone-dependent branching inhibition pathway. The d14 mutant exhibits increased shoot branch-ing with reduced plant height like the previously characterized strigolactone-deficient and -insensitive mutants d10 and d3, respectively. The d10-1 d14-1 double mutant is phenotypically indistinguishable from the d10-1 and d14-1 single mutants, consistent with the idea that D10 and D14 function in the same pathway. However, unlike with d10, the d14 branching phenotype could not be rescued by exogenous strigolactones. In addition, the d14 mutant contained a higher level of 2′-epi-5-deoxystrigol than the wild type. Positional cloning revealed that D14 encodes a protein of the α/β-fold hydrolase superfamily, some members of which play a role in metabolism or signaling of plant hormones. We propose that D14 functions downstream of strigolactone synthesis, as a component of hormone signaling or as an enzyme that participates in the conversion of strigolactones to the bioactive form.

Keywords: DWARF 14; Hormone signaling; Rice; Shoot branching; Strigolactone

Journal Article.  5133 words.  Illustrated.

Subjects: Biochemistry ; Molecular and Cell Biology ; Plant Sciences and Forestry

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