Role of brassinosteroids in autoregulation of nodulation

O’Rourke, T. A., Ferguson, B. J., Reid, J. B. and Foo, E. (2006) Role of brassinosteroids in autoregulation of nodulation. Phytopathology, 96 6 Suppl.: S88-S88.

Author O’Rourke, T. A.
Ferguson, B. J.
Reid, J. B.
Foo, E.
Title Role of brassinosteroids in autoregulation of nodulation
Journal name Phytopathology   Check publisher's open access policy
ISSN 0031-949X
Publication date 2006-06
Sub-type Article (original research)
Volume 96
Issue 6 Suppl.
Start page S88
End page S88
Total pages 1
Place of publication St. Paul, MN, United States
Publisher American Phytopathological Society
Language eng
Abstract Nodules provide the ideal environment for rhizobia to fix atmospheric nitrogen and convert it into a form plants can utilize. During nodulation it has been shown that there is an autoregulation of the number of nodules formed and that this involves a shoot derived signal. Recent work with brassinosteroid deficient mutants lk and lkb has shown that brassinosteroid deficiency in the shoot can reduce nodulation (Ferguson et al. 2005). Hence we examined whether brassinosteroids are involved in autoregulation of nodule numbers in pea (Pisum sativum L.). In order to identify the role of brassinosteroids in autoregulation double mutants were isolated from three crosses between lk and three non-allelic hypernodulating mutants, sym28, sym29 and nod3. Preliminary results suggest these double mutants possess a hypernodulating root phenotype even though lk is present. However even though double mutants appeared to hypernodulate they did not produce as many nodules as their hypernodulating parent, probably because the size of the root system was reduced. As double mutants from all three crosses hypernodulate it does not appear that brassinosteroids are necessary for hypernodulation. The result of further studies with these double mutants will be described in order to confirm the independence of brassinosteroid level and the autoregulation of nodulation.
Q-Index Code CX
Q-Index Status Provisional Code
Institutional Status UQ
Additional Notes 2006 APS Annual Meeting Abstracts of Presentations

Document type: Journal Article
Sub-type: Article (original research)
Collection: Centre for Integrative Legume Research Publications
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Created: Tue, 19 Apr 2011, 16:48:47 EST by Dr Brett Ferguson on behalf of Centre for Integrative Legume Research