Journal Article

Isolation and Characterization of an <i>Arabidopsis</i> Mutant, <i>fireworks (fiw)</i>, Which Exhibits Premature Cessation of Inflorescence Growth and Early Leaf Senescence

Masanobu Nakamura, Nobuyoshi Mochizuki and Akira Nagatani

in Plant and Cell Physiology

Published on behalf of Japanese Society of Plant Physiologists

Volume 41, issue 1, pages 94-103
Published in print January 2000 | ISSN: 0032-0781
Published online January 2000 | e-ISSN: 1471-9053 | DOI: http://dx.doi.org/10.1093/pcp/41.1.94
Isolation and Characterization of an Arabidopsis Mutant, fireworks (fiw), Which Exhibits Premature Cessation of Inflorescence Growth and Early Leaf Senescence

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To examine the mechanism underlying the reproductive development in monocarpic plants, we screened for mutants that exhibit premature cessation of inflorescence growth in Arabidopsis. We identified a novel mutant line that exhibited earlier cessation of flower formation and inflorescence stem elongation. This mutant also exhibited accelerated rosette leaf senescence after the cessation of the inflorescence growth. We designated the mutant fireworks (fiw) because flowers and siliques were clustered at the top of the fiw inflorescence. The fiw mutation was a single, recessive mutation and mapped on the lower part of chromosome 4. The fiw phenotype was not observable during vegetative growth, but the inflorescence growth was arrested more than 7 d earlier than the wild type (WT). Microscopic observation revealed that the fiw apical meristem was structurally preserved. The premature arrest of growth was observed not only in the primary inflorescence but also in the lateral inflorescence, which is consistent with the global proliferative arrest observed later in WT. Regardless of such dramatic phenotypic features, the fiw plants bore normal flowers and set fully matured siliques.

Keywords: Arabidopsis thaliana; Dwarf; Meristematic activity; Mutant; Stem elongation; Whole-plant senescence

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

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