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Related Experiment Videos

A rice mutant defective in Si uptake.

Jian Feng Ma1, Kazunori Tamai, Masahiko Ichii

  • 1Faculty of Agriculture, Kagawa University, Ikenobe 2393, Miki-cho, Kita-gun, Kagawa 761-0795, Japan. maj@ag.kagawa-u.ac.jp

Plant Physiology
|December 14, 2002
PubMed
Summary

Researchers identified a rice mutant (GR1) with significantly reduced silicon (Si) uptake. This discovery suggests a disruption in the active transport system responsible for Si absorption in rice plants.

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Area of Science:

  • Plant Physiology
  • Molecular Biology
  • Agricultural Science

Background:

  • Rice (Oryza sativa) accumulates substantial silicon (Si) in its shoots, crucial for structural integrity and stress resistance.
  • The precise mechanism governing high Si uptake by rice roots remains largely unelucidated.
  • Understanding Si uptake is vital for improving crop resilience and yield.

Purpose of the Study:

  • To investigate the genetic basis of active silicon (Si) uptake in rice roots.
  • To identify and characterize a mutant with impaired Si absorption.
  • To elucidate the transport mechanism for Si in rice.

Main Methods:

  • Mutagenesis of rice cv Oochikara using sodium azide.
  • Screening of M(2) seeds for altered Si uptake phenotypes.

Related Experiment Videos

  • Comparative uptake experiments of Si, phosphorus, and potassium in wild type (WT) and mutant (GR1) rice.
  • Analysis of Si concentration in xylem sap.
  • Investigating the effect of metabolic inhibitors and low temperature on Si uptake.
  • Segregation analysis of F(2) populations.

    • Main Results:

    • A mutant, GR1, was isolated with significantly reduced Si uptake compared to WT, while other nutrient uptake remained unaffected.
    • GR1 exhibited droopy leaf blades when Si was supplied, unlike WT.
    • Si concentration in GR1 xylem sap was markedly lower than in WT.
    • Si uptake in WT was sensitive to metabolic inhibitors and low temperature, but GR1 uptake was not.
    • Genetic analysis indicated GR1 is a recessive mutant controlling Si uptake.

    Conclusions:

    • A specific, active transport system is responsible for high Si uptake in rice roots.
    • The GR1 mutation disrupts this active Si transport mechanism.
    • The findings provide insights into the genetic control of Si accumulation in rice, paving the way for breeding efforts.