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Unifoliata-Afila interactions in pea leaf morphogenesis.

Darleen A Demason¹, Venkateswari Chetty, Lana S Barkawi

¹Department of Botany and Plant Sciences, University of California, Riverside, CA 92521, USA. demason@ucr.edu

American Journal of Botany

|February 13, 2013

Summary

Gene interactions involving auxin regulate pea leaf development. The AF and UNI genes show an antagonistic relationship, with UNI promoting high auxin levels and AF suppressing them, leading to diverse leaf forms.

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Area of Science:

Plant developmental biology
Molecular genetics
Hormone signaling

Background:

Leaf morphogenesis drives plant diversity.
Pisum sativum (pea) is a model for studying gene and hormone interactions in leaf development.
Mutant phenotypes reveal genetic control over leaf form.

Purpose of the Study:

Investigate the role of auxin in AF and UNI gene function.
Understand the interaction between AF and UNI genes in pea leaf development.
Characterize how these genes influence auxin levels, transport, and response.

Main Methods:

Phenotypic analysis of afila (af) and unifoliata (uni) double mutants.
Quantification of auxin levels and transport in mutant lines.
Assessing auxin response using DR5::GUS reporter.
Analyzing expression of auxin-regulated genes.

Main Results:

af uni double mutants exhibit leaflets and tendrils.
af mutants show increased auxin content, response, and gene expression.
uni mutants display reduced auxin content and transport.
uni-tac mutants have altered auxin content, transport, and response.

Conclusions:

Auxin concentration and response differences define the AF-UNI antagonistic relationship.
UNI promotes high auxin levels, while AF suppresses them.
These gene-mediated auxin modulations are key to pea leaf development.