Pea Compound Leaf Architecture Is Regulated by Interactions among the Genes UNIFOLIATA, COCHLEATA, AFILA, and TENDRIL-LESS

The compound leaf primordium of pea represents a marginal blastozone that initiates organ primordia, in an acropetal manner, from its growing distal region. The UNIFOLIATA (UNI) gene is important in marginal blastozone maintenance because loss or reduction of its function results in uni mutant leave...

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Bibliographic Details
Published in:The Plant cell 2000-08, Vol.12 (8), p.1279-1294
Main Authors: Gourlay, Campbell W., Julie M. I. Hofer, T. H. Noel Ellis
Format: Article
Language:English
Subjects:
AFILA gene
Architectural control
Architecture
COCHLEATA gene
Genetic mutation
Leaf development
Leaves
Peas
Pisum sativum
Plant cells
Plants
Stipules
TENDRIL-LESS gene
Tendrils
UNIFOLIATA gene
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Summary:The compound leaf primordium of pea represents a marginal blastozone that initiates organ primordia, in an acropetal manner, from its growing distal region. The UNIFOLIATA (UNI) gene is important in marginal blastozone maintenance because loss or reduction of its function results in uni mutant leaves of reduced complexity. In this study, we show that UNI is expressed in the leaf blastozone over the period in which organ primordia are initiated and is downregulated at the time of leaf primordium determination. Prolonged UNI expression was associated with increased blastozone activity in the complex leaves of afila (af), cochleata (coch), and afila tendril-less (af tl) mutant plants. Our analysis suggests that UNI expression is negatively regulated by COCH in stipule primordia, by AF in proximal leaflet primordia, and by AF and TL in distal and terminal tendril primordia. We propose that the control of UNI expression by AF, TL, and COCH is important in the regulation of blastozone activity and pattern formation in the compound leaf primordium of the pea.
ISSN:1040-4651
1532-298X
DOI:10.1105/tpc.12.8.1279