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OsbZIP1 regulates phosphorus uptake and nitrogen utilization, contributing to improved yield.

Nobuhiro Tanaka1,2, Saki Yoshida2, Md Saiful Islam2,3

  • 1Institute of Crop Science, National Agriculture and Food Research Organization, Tsukuba-shi, Japan.

The Plant Journal : for Cell and Molecular Biology
|January 12, 2024
PubMed
Summary

A rice mutant with enhanced nutrient uptake and utilization efficiency (NUtE, PUpE) demonstrated improved crop yields. This study identified OsbZIP1 as a key gene for these beneficial plant traits.

Keywords:
N utilizationOsbZIP1P uptakeroot architectureyields

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Area of Science:

  • Plant Science
  • Genetics
  • Agricultural Science

Background:

  • Improving nutrient use efficiency in crops is crucial for sustainable agriculture and reducing fertilizer reliance.
  • Plant root architecture and nutrient transporter gene expression significantly influence nutrient uptake and utilization.

Purpose of the Study:

  • To characterize a rice mutant (88n) with enhanced nutrient uptake and utilization efficiencies.
  • To identify the genetic basis of the observed traits in the 88n mutant.
  • To evaluate the yield potential of the 88n mutant in field conditions.

Main Methods:

  • Phenotypic characterization of the 88n rice mutant under low nitrogen and phosphorus conditions.
  • Analysis of nutrient transporter gene expression in roots and nutrient concentrations in shoots.
  • Molecular genetic analysis to identify the causal gene.
  • Field trials over three years to assess crop yield.

Main Results:

  • The 88n mutant exhibited long roots under nutrient-limited conditions, showing high nitrogen utilization efficiency (NUtE) and phosphorus uptake efficiency (PUpE).
  • Low expression of nitrogen transporter genes and higher mRNA accumulation of phosphorus transporter genes were observed in 88n roots.
  • The causal gene was identified as OsbZIP1, a homolog of Arabidopsis HY5.
  • Field trials revealed that 88n produced larger panicles and increased panicle weight per plant.

Conclusions:

  • Mutation in OsbZIP1 enhances nutrient uptake and utilization efficiencies in rice.
  • OsbZIP1 plays a significant role in root development and nutrient homeostasis.
  • The 88n mutant demonstrates potential for improving crop yields through enhanced nutrient use efficiency.