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<p>The overuse of chemical fertilizers poses serious environmental threats, including soil degradation, nutrient runoff, and leaching, emphasizing the urgent need for sustainable alternatives. This study investigates a novel biostimulant formulation—Yeast: Cysteine: Ascorbate (YCA)—as a multifaceted priming agent to enhance rice resilience under nutrient-deficient conditions. It examines how YCA modulates carbohydrate metabolism, photosynthate partitioning, translocation, and stress tolerance mechanisms across different growth stages from seedling to ripening. Rice plants were cultivated in nutrient-deficient soil, with YCA applied as a seed priming agent and soil amendment. Key parameters assessed included photosynthetic pigments, carbohydrate composition (sucrose, starch, reducing and non-reducing sugars), activities of sucrose-metabolizing enzymes, leaf osmotic potential, free amino acids, non-enzymatic antioxidants, and yield-related traits. Nutrient deficiency marked significant reductions in carbohydrate levels in flag leaves, disrupted sucrose/starch allocation, and lowered grain yield by up to 40%. YCA treatment, under nutrient deficient conditions, led to a 25–35% increase in total soluble sugars and sucrose content, along with a 30–45% increase in sucrose synthase (SuSy) and sucrose phosphate synthase (SPS) activity up to the booting stage. These changes contributed to enhanced starch accumulation and a 32% increase in grain yield under nutrient deficient condition. Protein accumulation increased by 20% during booting and ripening stages, supporting improved osmotic regulation. YCA application significantly enhances carbohydrate metabolism, enzyme activity, and protein accumulation during key developmental stages, increasing grain yield and starch content under nutrient-deficient conditions. These findings highlight YCA’s potential as an eco-friendly and economically beneficial strategy to mitigate nutrient deficiency in rice cultivation. Future research aims to explore metabolomic insights, field-scale applications, and broader crop adaptability.</p>

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Biostimulants Enhance Photosynthate Partitioning, Translocation and Stress Tolerance in Rice

  • 期刊论文

  • 发表日期：

    2025年7月2日

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  • Riya Johnson,
  • Joy M. Joel,
  • Jos T. Puthur

摘要

The overuse of chemical fertilizers poses serious environmental threats, including soil degradation, nutrient runoff, and leaching, emphasizing the urgent need for sustainable alternatives. This study investigates a novel biostimulant formulation—Yeast: Cysteine: Ascorbate (YCA)—as a multifaceted priming agent to enhance rice resilience under nutrient-deficient conditions. It examines how YCA modulates carbohydrate metabolism, photosynthate partitioning, translocation, and stress tolerance mechanisms across different growth stages from seedling to ripening. Rice plants were cultivated in nutrient-deficient soil, with YCA applied as a seed priming agent and soil amendment. Key parameters assessed included photosynthetic pigments, carbohydrate composition (sucrose, starch, reducing and non-reducing sugars), activities of sucrose-metabolizing enzymes, leaf osmotic potential, free amino acids, non-enzymatic antioxidants, and yield-related traits. Nutrient deficiency marked significant reductions in carbohydrate levels in flag leaves, disrupted sucrose/starch allocation, and lowered grain yield by up to 40%. YCA treatment, under nutrient deficient conditions, led to a 25–35% increase in total soluble sugars and sucrose content, along with a 30–45% increase in sucrose synthase (SuSy) and sucrose phosphate synthase (SPS) activity up to the booting stage. These changes contributed to enhanced starch accumulation and a 32% increase in grain yield under nutrient deficient condition. Protein accumulation increased by 20% during booting and ripening stages, supporting improved osmotic regulation. YCA application significantly enhances carbohydrate metabolism, enzyme activity, and protein accumulation during key developmental stages, increasing grain yield and starch content under nutrient-deficient conditions. These findings highlight YCA’s potential as an eco-friendly and economically beneficial strategy to mitigate nutrient deficiency in rice cultivation. Future research aims to explore metabolomic insights, field-scale applications, and broader crop adaptability.