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Zinc deficiency impacts rice plants, but tolerant varieties maintain ascorbic acid (AsA) levels through enhanced biosynthesis pathways and protective compounds like proline.

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Area of Science:

  • Plant Physiology
  • Nutritional Biochemistry
  • Agricultural Science

Background:

  • Zinc deficiency is a major abiotic stress affecting rice production globally.
  • Ascorbic acid (AsA) plays a crucial role in plant stress response.
  • Understanding genotypic differences in AsA metabolism under zinc stress is vital for crop improvement.

Purpose of the Study:

  • To investigate the effects of zinc deficiency on shoot metabolites in contrasting rice genotypes.
  • To elucidate the mechanisms of ascorbic acid (AsA) biosynthesis, recycling, and catabolism under low zinc conditions.
  • To identify key compounds contributing to zinc tolerance in rice.

Main Methods:

  • Comparative analysis of two rice genotypes (IR74 sensitive, RIL46 tolerant) under zinc-deficient and control conditions.
  • Monitoring of shoot metabolites, including ascorbic acid and its precursors/catabolites, at different stress stages.
  • Gene expression analysis for key pathways involved in AsA metabolism and other stress-related compounds.

Main Results:

  • Sensitive genotype IR74 showed decreased AsA concentration and increased lipid peroxidation under zinc deficiency.
  • Tolerant genotype RIL46 maintained AsA levels, exhibiting enhanced transcript levels in AsA biosynthesis pathways (mannose/L-galactose and myo-inositol).
  • RIL46 possessed constitutively higher AsA precursors and accumulated higher levels of proline and trehalose under stress.

Conclusions:

  • Genotypic variation in AsA metabolism and accumulation of compatible solutes contribute to zinc tolerance in rice.
  • The mannose/L-galactose and myo-inositol pathways are important for maintaining AsA levels under zinc stress.
  • Proline and trehalose may play significant roles in enhancing zinc efficiency and stress tolerance in rice.