| Involvement of auxin distribution in root nodule development of Lotus japonicus. | |
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MedLine Citation:
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PMID: 21369920 Owner: NLM Status: Publisher |
Abstract/OtherAbstract:
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The symbiosis between legume plants and rhizobia causes the development of new organs, nodules which function as an apparatus for nitrogen fixation. In this study, the roles of auxin in nodule development in Lotus japonicus have been demonstrated using molecular genetic tools and auxin inhibitors. The expression of an auxin-reporter GH3 fused to β-glucuronidase (GUS) was analyzed in L. japonicus roots, and showed a strong signal in the central cylinder of the root, whereas upon rhizobium infection, generation of GUS signal was observed at the dividing outer cortical cells during the first nodule cell divisions. When nodules were developed to maturity, strong GUS staining was detected in vascular tissues of nodules, suggesting distinct auxin involvement in the determinate nodule development. Numbers and the development of nodules were affected by auxin transport inhibitors (1-naphthylphthalamic acid, NPA and triindobenzoic acid, TIBA), and by a newly synthesized auxin antagonist, α-(phenyl ethyl-2-one)-indole-3-acetic acid (PEO-IAA). The common phenotypical alteration by these auxin inhibitors was the inhibition in forming lenticel which is normally developed on the nodule surface from the root outer cortex. The inhibition of lenticel formation was correlated with the inhibition of nodule vascular bundle development. These results indicate that auxin is required for the normal development of determinate nodules in a multidirectional manner. |
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Authors:
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Kojiro Takanashi; Akifumi Sugiyama; Kazufumi Yazaki |
Publication Detail:
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Type: JOURNAL ARTICLE Date: 2011-3-3 |
Journal Detail:
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Title: Planta Volume: - ISSN: 1432-2048 ISO Abbreviation: - Publication Date: 2011 Mar |
Date Detail:
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Created Date: 2011-3-3 Completed Date: - Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 1250576 Medline TA: Planta Country: - |
Other Details:
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Languages: ENG Pagination: - Citation Subset: - |
Affiliation:
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Research Institute for Sustainable Humanosphere, Kyoto University, Gokasho, Uji, 611-0011, Japan. |
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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