Molecular and genetic analyses of the silky1 gene reveal conservation in floral organ specification between eudicots and monocots

The degree to which the eudicot-based ABC model of flower organ identity applies to the other major subclass of angrosperms, the monocots, has yet to be fully explored. We cloned silky1 (si1), a male sterile mutant of Zea mays that has homeotic conversions of stamens into carpels and lodicules into...

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Bibliographic Details
Published in:Molecular cell 2000-03, Vol.5 (3), p.569-579
Main Authors: Ambrose, B A, Lerner, D R, Ciceri, P, Padilla, C M, Yanofsky, M F, Schmidt, R J
Format: Article
Language:English
Subjects:
Adaptor Protein Complex alpha Subunits
Adaptor Proteins, Vesicular Transport
Biological Evolution
Cloning, Molecular - methods
DEFICIENS Protein
DNA Transposable Elements
DNA-Binding Proteins - genetics
Genes, Homeobox
Genes, Plant
Homeodomain Proteins - genetics
MADS Domain Proteins
Magnoliopsida - genetics
Membrane Proteins - genetics
Models, Biological
Morphogenesis - genetics
Mutation
Plant Proteins - genetics
Plant Shoots - anatomy & histology
Plant Shoots - genetics
Silky1 gene
Time Factors
Tissue Distribution
Transcription Factors - genetics
Zea mays
Zea mays - anatomy & histology
Zea mays - genetics
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Summary:The degree to which the eudicot-based ABC model of flower organ identity applies to the other major subclass of angrosperms, the monocots, has yet to be fully explored. We cloned silky1 (si1), a male sterile mutant of Zea mays that has homeotic conversions of stamens into carpels and lodicules into palea/lemma-like structures. Our studies indicate that si1 is a monocot B function MADS box gene. Moreover, the si1 zag1 double mutant produces a striking spikelet phenotype where normal glumes enclose reiterated palea/lemma-like organs. These studies indicate that B function gene activity is conserved among monocots as well as eudicots. In addition, they provide compelling developmental evidence for recognizing lodicules as modified petals and, possibly, palea and lemma as modified sepals.
ISSN:1097-2765
DOI:10.1016/S1097-2765(00)80450-5