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OsDISMO1: A Novel Transporter for Molybdenum Distribution in Rice Shoots.

Prashant Kandwal1, Toru Fujiwara1, Takehiro Kamiya2

  • 1Laboratory of Plant Nutrition and Fertilizers, Department of Applied Biological Chemistry, Graduate School of Agriculture and Life Sciences, The University of Tokyo, Tokyo, Japan.

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PubMed
Summary

Researchers discovered OsDISMO1, a new molybdenum transporter in rice. This gene is crucial for molybdenum distribution, moving the essential micronutrient from older to newer plant tissues.

Keywords:
Endoplasmic reticulumMicronutrientMolybdenum transporterOsDISMO1PhloemRice ionomics

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Area of Science:

  • Plant Biology
  • Molecular Biology
  • Nutrient Transport

Background:

  • Molybdenum (Mo) is vital for plant growth, essential for molybdoenzyme function.
  • Only one molybdate transporter (MOT) was previously known in plants, leaving other Mo transport mechanisms unclear.

Purpose of the Study:

  • To identify novel molybdenum transporter genes in rice.
  • To characterize the function and localization of a newly discovered Mo transporter, OsDISMO1.

Main Methods:

  • Gene mapping of a high Mo grain mutant in rice.
  • Phenotypic analysis of knockout mutants.
  • Mo concentration analysis in different leaf tissues.
  • Promoter-GUS and GFP-fusion protein localization studies.
  • Heterologous expression in yeast (Saccharomyces cerevisiae).

Main Results:

  • A novel Mo transporter gene, OsDISMO1, was identified in rice.
  • OsDISMO1 is responsible for the high Mo grain mutant phenotype.
  • OsDISMO1 facilitates Mo movement, with altered distribution in young and flag leaves of the mutant.
  • Expression analysis showed OsDISMO1 is localized to vascular bundles, particularly phloem.
  • Protein localization confirmed OsDISMO1 in the endoplasmic reticulum membrane.

Conclusions:

  • OsDISMO1 functions as a molybdenum transporter in rice.
  • This transporter plays a key role in the distribution of molybdenum within the plant.
  • OsDISMO1 facilitates the movement of Mo from source to sink tissues.