Initiation of a legume nodule with an indeterminate meristem involves proliferating host cells that harbour infection threads

A comparative analysis of nodule morphogenesis was carried out for three symbiotically defective pea (Pisum sativum) mutants that show abnormalities in nodule development. In the wild-type lines, resumption of cell proliferation in the pericycle and inner cortex results in the development of a nodul...

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Bibliographic Details
Published in:The New phytologist 2009-03, Vol.181 (4), p.913-923
Main Authors: Voroshilova, Vera A., Demchenko, Kirill N., Brewin, Nicholas J., Borisov, Alexey Y., Tikhonovich, Igor A.
Format: Article
Language:English
Subjects:
Bacteria
Cell growth
Cell Proliferation
Developmental biology
ineffective nodules
infection thread
Infections
Meristem - cytology
Meristem - microbiology
Meristems
Mutation
nodule meristem
nodule primordium
Nodules
pea-Rhizobium symbiosis
Peas
Phenotypes
Pisum sativum - genetics
Pisum sativum - microbiology
Pisum sativum - physiology
Plant cells
Rhizobium - physiology
Root Nodules, Plant - genetics
Root Nodules, Plant - microbiology
Root Nodules, Plant - physiology
Symbiosis
symbiotic genes
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Summary:A comparative analysis of nodule morphogenesis was carried out for three symbiotically defective pea (Pisum sativum) mutants that show abnormalities in nodule development. In the wild-type lines, resumption of cell proliferation in the pericycle and inner cortex results in the development of a nodule primordium, within which are found proliferating cells that harbour infection threads. However, this class of cell is not observed in the mutants RisFixA (sym41) and SGEFix⁻-2 (sym33) where nodule development is arrested at the point of formation of the apical nodule meristem. It is proposed that the presence of proliferating cells harbouring infection threads is a prerequisite for normal formation of the nodule meristem. In mutant SGEFix⁻-1 (sym40), nodule development does not differ from that of wild-type plants in the early stages but is blocked at the stage after nodule meristem persistence. A scheme is proposed for the sequential functioning of pea symbiotic genes Sym33, Sym40 and Sym41 in the programme of nodule development.
ISSN:0028-646X
1469-8137
DOI:10.1111/j.1469-8137.2008.02723.x