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<p>2-acetyl-1-pyrroline (2-AP) is the main aromatic component of fragrant rice. NaHSO<sub>3</sub> has been shown to enhance crop photosynthesis and consequently affect product quality. However, there have been few reports on the effects of NaHSO<sub>3</sub> on 2-AP in fragrant rice. In this field study, three NaHSO<sub>3</sub> application levels were implemented (T0: 0 mmol/L; T1: 1 mmol/L; T2: 2 mmol/L) through foliar spraying at the early grain-filling stage. The fragrant rice varieties Yexiangyou Lisi (YXY LS) and YexiangyouHang 1573(YXYH 1573) were used as experimental materials. Under T1 treatment, NaHSO<sub>3</sub> synergistically increased the activities of proline dehydrogenase and ornithine aminotransferase, concurrently elevating pyrroline-5-carboxylate content in both early-season YXY LS and late-season YXYH 1573, ultimately leading to elevated 2-AP accumulation. The T1 treatment significantly enhanced seed-setting rate in early-season YXY LS, while simultaneously improving both seed-setting rate and 1000-grain weight in late-season YXYH 1573. These synergistic effects translated into a yield boost across both rice cultivars. Foliar application of 1 mmol/L NaHSO<sub>3</sub> during the pre-grain filling stage can serve as a dual-functional agronomic strategy to amplify both 2-AP and yield in fragrant rice.</p>

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NaHSO₃ Foliar Application Promotes 2‑Acetyl-1-pyrroline Biosynthesis and Yield Components in Fragrant Rice

  • 期刊论文

  • 发表日期：

    2025年12月18日

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  • Deng Quanquan,
  • Liu Chunlan,
  • Xiao Huaqing

摘要

2-acetyl-1-pyrroline (2-AP) is the main aromatic component of fragrant rice. NaHSO3 has been shown to enhance crop photosynthesis and consequently affect product quality. However, there have been few reports on the effects of NaHSO3 on 2-AP in fragrant rice. In this field study, three NaHSO3 application levels were implemented (T0: 0 mmol/L; T1: 1 mmol/L; T2: 2 mmol/L) through foliar spraying at the early grain-filling stage. The fragrant rice varieties Yexiangyou Lisi (YXY LS) and YexiangyouHang 1573(YXYH 1573) were used as experimental materials. Under T1 treatment, NaHSO3 synergistically increased the activities of proline dehydrogenase and ornithine aminotransferase, concurrently elevating pyrroline-5-carboxylate content in both early-season YXY LS and late-season YXYH 1573, ultimately leading to elevated 2-AP accumulation. The T1 treatment significantly enhanced seed-setting rate in early-season YXY LS, while simultaneously improving both seed-setting rate and 1000-grain weight in late-season YXYH 1573. These synergistic effects translated into a yield boost across both rice cultivars. Foliar application of 1 mmol/L NaHSO3 during the pre-grain filling stage can serve as a dual-functional agronomic strategy to amplify both 2-AP and yield in fragrant rice.