The Arabidopsis compact inflorescence genes: phase-specific growth regulation and the determination of inflorescence architecture

Citation
L. Goosey et R. Sharrock, The Arabidopsis compact inflorescence genes: phase-specific growth regulation and the determination of inflorescence architecture, PLANT J, 26(5), 2001, pp. 549-559
Citations number
25
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Plant Sciences","Animal & Plant Sciences
Journal title
PLANT JOURNAL
ISSN journal
0960-7412 → ACNP
Volume
26
Issue
5
Year of publication
2001
Pages
549 - 559
Database
ISI
SICI code
0960-7412(200106)26:5<549:TACIGP>2.0.ZU;2-G
Abstract
During their life cycle, higher plants pass through a series of growth phas es that are characterized by the production of morphologically distinct veg etative and reproductive organs and by different growth patterns. Three maj or phases have been described in Arabidopsis: juvenile vegetative, adult ve getative, and reproductive. In this report we describe a novel, phase-speci fic mutant in Arabidopsis, compact inflorescence (cif). The most apparent a spect of the cif phenotype is a strong reduction in the elongation of inter nodes in the inflorescence, resulting in the formation of a floral cluster at the apical end of all reproductive shoots. Elongation and expansion of a dult vegetative rosette leaves are also compromised in mutant plants. The o nset of the cif trait correlates closely with morphological changes marking the phase transition from juvenile to adult, and mutant plants produce nor mal flowers and are fully fertile. Hence the cif phenotype appears to be ad ult vegetative phase-specific. Histological sections of mutant inflorescenc e internodes indicate normal tissue specification, but reduced cell elongat ion compared to wild-type. compact inflorescence is inherited as a two-gene trait involving the action of a recessive and a dominant locus. These two cif genes appear to be key components of a growth regulatory pathway that i s closely linked to phase change, and specifies critical aspects of plant g rowth and architecture including inflorescence internode length.