Cited by 223Plant Molecular Biology ResearchGenetic Mapping and Diversity in Plants and AnimalsPlant Genetic and Mutation Studies

The LAX1 and FRIZZY PANICLE 2 Genes Determine the Inflorescence Architecture of Rice by Controlling Rachis-Branch and Spikelet Development

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Komatsu, Mai, Maekawa, Masahiko, Shimamoto, Ko, Kyozuka, Junko·2001·Developmental Biology

Abstract

We have analyzed two mutants that exhibit altered panicle architecture in rice (Oryza sativa L.). In lax1-2, which is a new and stronger allele of the previously reported lax mutant, initiation and/or maintenance of rachis-branches, lateral spikelets, and terminal spikelets was severely prevented. In situ hybridization analysis using OSH1, a rice knotted1 (kn1) ortholog, confirmed the absence of lateral meristems in lax1-2 panicles. These defects indicate that the LAX1 gene is required for the initiation/maintenance of axillary meristems in the rice panicle. In addition to its role in forming lateral meristems, the wild-type LAX1 gene acts as a floral meristem identity gene which specifies the terminal spikelet meristem. A comparison of the defects in lax1-1 and lax1-2 plants suggested that the sensitivities to reduced LAX1 activity were not uniform among different types of meristems. In the fzp2 mutant panicle, the basic branching pattern of the panicle was indistinguishable from that of the wild type; however, specification of both terminal and lateral spikelet meristems was blocked, and sequential rounds of branching occurred at the point where the spikelet meristems are initiated in the wild-type panicle. This resulted in the generation of a panicle composed of excessive ramification of rachis-branches. The lax1-1 fzp2 double mutants exhibited a novel, basically additive, phenotype, which suggests that LAX1 and FZP2 function in genetically independent pathways.

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Crossref · 10.1006/dbio.2000.9988

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  • ROX in Arabidopsis, LAX1 in rice, and BA1 in maize influence axillary meristem development.

    “Another factor is a basic helix-loop-helix (bHLH) protein called REGULATOR OF AXILLARY MERISTEM FORMATION (ROX) in Arabidopsis (Yang et al., 2012), LAX PANICLE1 (LAX1) in rice (Komatsu et al., 2001, 2003) and BARREN STALK1 (BA1) in maize (Ritter et al., 2002; Gallavotti et al., 2004).”

    From Shaping plant architecture (2015) · cites this paper as Komatsu et al., 2001

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Authors
Komatsu, M., Maekawa, M., Shimamoto, K., & Kyozuka, J.
Affiliations
  • Nara Institute of Science and Technology (JP)
  • Okayama University (JP)
  • Japan Science and Technology Agency (JP)
Corresponding author
Kyozuka, Junko
Venue
Developmental Biology
Publisher
Elsevier BV
Published
2001-03
Volume
231
Issue
2
Pages
364-373
ISSN
0012-1606 (ISSN-L)
OpenAlex
W2053025728
Cited by
223
References
37
Citations by year
2026: 6 · 2025: 11 · 2024: 9 · 2023: 13 · 2022: 13 · 2021: 17 · 2020: 10 · 2019: 16 · 2018: 14 · 2017: 14 · 2016: 6 · 2015: 8 · 2014: 8 · 2013: 9 · 2012: 4
FWCI
7.73
Type
journal article
Language
en
Open access
Locations
  • Developmental Biology (publishedVersion)
  • PubMed (publishedVersion)
Funders
Japan Society for the Promotion of Science
Topics
  • Life Sciences › Agricultural and Biological Sciences › Plant Science › Plant Molecular Biology Research
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Genetics › Genetic Mapping and Diversity in Plants and Animals
  • Life Sciences › Agricultural and Biological Sciences › Plant Science › Plant Genetic and Mutation Studies
Keywords
LAX1, inflorescence development, axillary meristem, floral meristem identity, double mutants
MeSH terms
Alleles, Microscopy, Electron, Scanning, Models, Biological, Mutation, Phenotype, Plant Proteins, Oryza, Trans-Activators, Mutagenesis, Genes, Plant, In Situ Hybridization, Homeodomain Proteins, Meristem

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