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Published on July 29, 2005; 10.1104/pp.105.062414

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Received March 7, 2005
Returned for revision May 1, 2005
Accepted May 2, 2005

Nodulation Phenotypes of Gibberellin and Brassinosteroid Mutants of Pea

Brett J. Ferguson , John J. Ross , and James B. Reid *

School of Plant Science, University of Tasmania, Hobart, Tasmania 7001, Australia; Australian Research Council Centre of Excellence for Integrative Legume Research, St. Lucia 4072, Australia
School of Plant Science, University of Tasmania, Hobart, Tasmania 7001, Australia

* Corresponding author; email: jim.reid{at}utas.edu.au.

The initiation and development of legume nodules induced by compatible Rhizobium species requires a complex signal exchange involving both plant and bacterial compounds. Phytohormones have been implicated in this process, although in many cases direct evidence is lacking. Here, we characterize the root and nodulation phenotypes of various mutant lines of pea (Pisum sativum) that display alterations in their phytohormone levels and/or perception. Mutants possessing root systems deficient in gibberellins (GAs) or brassinosteroids (BRs) exhibited a reduction in nodule organogenesis. The question of whether these reductions represent direct or indirect effects of the hormone deficiency is addressed. For example, the application of GA to the roots of a GA-deficient mutant completely restored its number of nodules to that of the wild type. Grafting studies revealed that a wild-type shoot or root also restored the nodule number of a GA-deficient mutant. These findings suggest that GAs are required for nodulation. In contrast, the shoot controlled the number of nodules that formed in graft combinations of a BR-deficient mutant and its wild type. The root levels of auxin and GA were similar among these latter graft combinations. These results suggest that BRs influence a shoot mechanism that controls nodulation and that the root levels of auxin and GA are not part of this process. Interestingly, a strong correlation between nodule and lateral root numbers was observed in all lines assessed, consistent with a possible overlap in the early developmental pathways of the two organs.




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