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Plant and Cell Physiology Advance Access published online on July 24, 2005
Plant and Cell Physiology, doi:10.1093/pcp/pci171
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Plant and Cell Physiology 2005 © The Japanese Society of Plant Physiologists (JSPP); all rights reserved.
Received May 5, 2005
Accepted July 12, 2005

Short Communication

Cochleata: Getting to the Root of Legume Nodules

Brett J. Ferguson 1 and James B. Reid 2*

1 School of Plant Science, University of Tasmania, Private Bag 55, Hobart, Tasmania, 7001, Australia; ARC Centre of Excellence for Integrative Legume Research, University of Queensland, Brisbane, Queensland, 4072, Australia
2 School of Plant Science, University of Tasmania, Private Bag 55, Hobart, Tasmania, 7001, Australia

* To whom correspondence should be addressed.
James B. Reid, E-mail: Jim.Reid{at}utas.edu.au


  Abstract

The homeotic mutant of Pisum sativum, cochleata, has stipules replaced by alternative leaf components, abnormal flowers and reduced fertility. Although the root system dry weight, root lengths and nodule numbers of cochleata are similar to those of its wild type, the nodulation phenotype of the mutant is unique. The nodules typically dichotomously branch and multiple callus and root structures emerge from their meristems. These nodule-roots incorporate a peripheral vascular bundle of the nodule into their own central vascular cylinder. Both the nodules and roots of the hybrid structures appear functional. Roles for COCHLEATA in development are discussed.

Keywords: cochleata; homeotic; meristem; mutant; nodulation; Pisum sativum.
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