Abstract
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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Abbreviations
- DsRed:
-
Discoma sp. red fluorescent protein
- Dpi:
-
Days post inoculation
- GUS:
-
β-Glucuronidase
- NPA:
-
1-Naphthylphthalamic acid
- PEO-IAA:
-
α-(Phenyl ethyl-2-one)-indole-3-acetic acid
- TIBA:
-
Triindobenzoic acid
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Acknowledgments
We would like to thank National Bioresource Project (Lotus japonicus, Glycine max) for seeds of L. japonicus and Dr. Ken-ichiro Hayashi (Okayama University of Science, Japan) for the PEO-IAA. We also wish to thank Dr. Niels Sandal and Dr. Jens Stougaard (University of Aarhus, Denmark) and Dr. Herman P. Spaink (Leiden State University, Netherlands) for seeds of GH3:GUS transformed L. japonicus (Lj3632.5.127). We thank Dr. Takashi Aoyama (Kyoto University, Japan) for the technical assistance in scanning electron microscope and the sample preparation and Dr. Makoto Hayashi (National Institute of Agrobiological Sciences, Japan) for the M. loti carrying DsRed. This work was supported in part by Grant-in-Aid for Scientific Research (No. 21027022 to K. Y.) and by Research Fellowship from the Japan Society for the Promotion of Science for Young Scientists (No. 09J00170 to K. T.).
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Takanashi, K., Sugiyama, A. & Yazaki, K. Involvement of auxin distribution in root nodule development of Lotus japonicus . Planta 234, 73–81 (2011). https://doi.org/10.1007/s00425-011-1385-0
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DOI: https://doi.org/10.1007/s00425-011-1385-0