Journal Article

Two Ineffective-Nodulating Mutants of <i>Lotus japonicus</i>—Different Phenotypes Caused by the Blockage of Endocytotic Bacterial Release and Nodule Maturation

Haruko Imaizumi-Anraku, Masayoshi Kawaguchi, Hiroyuki Koiwa, Shoichiro Akao and Kunihiko Syōno

in Plant and Cell Physiology

Published on behalf of Japanese Society of Plant Physiologists

Volume 38, issue 7, pages 871-881
Published in print January 1997 | ISSN: 0032-0781
Published online January 1997 | e-ISSN: 1471-9053 | DOI: http://dx.doi.org/10.1093/oxfordjournals.pcp.a029246
Two Ineffective-Nodulating Mutants of Lotus japonicus—Different Phenotypes Caused by the Blockage of Endocytotic Bacterial Release and Nodule Maturation

More Like This

Show all results sharing these subjects:

  • Biochemistry
  • Molecular and Cell Biology
  • Plant Sciences and Forestry

GO

Show Summary Details

Preview

Mutants defective in nodule development and nitrogen fixation of Lotus japonicus B-129 ‘Gifu’ were obtained by induced mutagenesis with EMS (ethylmethane sulfonate) treatment. Using a symbiont of L. japonicus, Rhizobium loti JRLS01, 17,000 M2 seeds were screened for plants affected in their symbiotic phenotype, resulting in the successful isolation of eleven stable mutants. In this paper, we report two ineffective nodulating mutants among them. Reciprocal crossing between wild type 'Gifu' and these mutants indicated that their phenotypes are under mono-genic and recessive control. Furthermore, tests for alle-lism with these mutants showed that the mutated genes are non-allelic. Ultrastructural analysis revealed that these mutants were inhibited at different stages of nodule development and maturation. Based on histological characteristics of the nodules, two ineffective nodulating mutants were named albl (aberrant localization of bacteria inside nodule) and fenl (fail in enlargement of infected cells), respectively. In the nodules of albl, most of the bacteria failed to invade the cytoplasm of cortical cells and were tightly confined inside infection threads or localized in intercellular spaces of nodules. Following prolonged inoculation, albl mutant also formed pale-pink colored nodules with a low frequency, in which bacteria differentiated into bacteroid and fixed nitrogen normally. Although the infected cells in the nodules of fenl mutant contained numerous differentiated bacteroids, they failed to enlarge by cell expansion and showed a low activity of nitrogen fixation.

Keywords: Endocytosis; Ineffective nodulating mutant; Legume-Rhizobium symbiosis; Lotus japonicus; Nitrogen fixation; Rhizobium loti

Journal Article.  0 words. 

Subjects: Biochemistry ; Molecular and Cell Biology ; Plant Sciences and Forestry

Full text: subscription required

How to subscribe Recommend to my Librarian

Users without a subscription are not able to see the full content. Please, subscribe or login to access all content.