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AOBPreview originally published online on October 3, 2006
Annals of Botany 2006 98(5):953-963; doi:10.1093/aob/mcl187
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© The Author 2006. Published by Oxford University Press on behalf of the Annals of Botany Company. All rights reserved. For Permissions, please email: journals.permissions@oupjournals.org

The Origin, Initiation and Development of Axillary Shoot Meristems in Lotus japonicus

NENA DE G. ALVAREZ, ROYDON J. MEEKING and DEREK W. R. WHITE*

Grasslands Research Centre, AgResearch Private Bag 11008, Palmerston North, New Zealand

* For correspondence. E-mail derek.white{at}agresearch.co.nz

Received: 10 April 2006    Returned for revision: 23 June 2006    Accepted: 24 July 2006    Published electronically: 3 October 2006

• Background and Aims Lotus japonicus ‘Gifu’ develops multiple axillary shoots in the cotyledonary node region throughout the growth of the plant. The origin, initiation and development of these axillary meristems were investigated.

• Methods Morphological, histological and mRNA in situ analyses were done to characterize the ontogeny of cotyledonary axillary shoot meristems in Lotus. Morphological characterization of a putative Lotus shoot branching mutant (super-accessory branches) sac, is presented.

• Key Results By using expression of an L. japonicus STM-like gene as a marker for meristematic tissues, it was demonstrated that groups of cells maintained in the meristematic state at the cotyledonary axil region coincide with the sites where additional axillary meristems (accessory meristems) form. A Lotus shoot branching mutant, sac, is a putative Lotus branching mutant characterized by increased proliferation of accessory shoots in all leaf axils including the cotyledons.

• Conclusion. In Lotus, axillary shoot meristems continually develop at the cotyledonary node region throughout the growth of the plant. These cotyledonary primary and accessory axillaries arise from the position of a meristematic zone of tissue at the cotyledonary node axil region.

Key words: Axillary meristems, accessory meristems, shoot branching, Lotus japonicus, sac


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