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<p>Climate change induced flooding poses a major challenge to rice establishment in direct seeding by creating anaerobic condition which is the major limiting factor during germination stage. Rice early establishment has direct effect on grain yield and productivity in direct seeding. Therefore, the present study aimed to evaluate morphological and biochemical traits associated with anaerobic germination tolerance in rice genotypes under aerobic and anaerobic seeding systems. A total of 44 rice genotypes were evaluated for 2 years in a controlled condition for 21 days using a complete randomized design (CRD) with three replications under aerobic and anaerobic seeded condition. The significant variation was observed among genotypes for germination percentage, seedling growth traits and enzymatic activities (alpha- amylase and sucrose synthase). Genotypes namely, IR4630-CSR11-175, CSR2748-171, CSR2748-4441-195, CSR2748-140 and CSRYET 7 exhibited 100, 100, 91, 91 and 90 per cent germination in anaerobic stress condition. These genotypes also enhanced α-amylase activity by 4.2 to 7.6 times and sucrose synthase activities by 3.2 to 4.8 times under anaerobic condition over aerobic condition. These enzymatic activates were positively correlated with germination percentage, seedling vigor, shoot and root length under anaerobic stress condition. The findings highlight the importance of carbohydrate metabolism in anaerobic germination. These identified promising genotypes (IR4630-CSR11-175, CSR2748-171, CSR2748-4441-195, CSR2748-140 and CSRYET 7) helps for breeding programs aimed at improving DSR adaptability. These genotypes represent valuable genomic resources for integrating molecular approaches may further elucidate the genetic basis of anaerobic germination tolerance.</p>

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Dissecting Morphological and Biochemical Variability in Rice for Aerobic and Anaerobic Direct Seeding Systems

  • 期刊论文

  • 发表日期：

    2026年7月16日

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  • Alisha Goyal,
  • P. C. Sharma,
  • Renu Munjal,
  • H. S. Jat,
  • B. M. Lokeshkumar,
  • Rakesh Mehra,
  • Virender Kumar,
  • Madhu Choudhary,
  • Suman Rathor,
  • S. L. Krishnamurthy

摘要

Climate change induced flooding poses a major challenge to rice establishment in direct seeding by creating anaerobic condition which is the major limiting factor during germination stage. Rice early establishment has direct effect on grain yield and productivity in direct seeding. Therefore, the present study aimed to evaluate morphological and biochemical traits associated with anaerobic germination tolerance in rice genotypes under aerobic and anaerobic seeding systems. A total of 44 rice genotypes were evaluated for 2 years in a controlled condition for 21 days using a complete randomized design (CRD) with three replications under aerobic and anaerobic seeded condition. The significant variation was observed among genotypes for germination percentage, seedling growth traits and enzymatic activities (alpha- amylase and sucrose synthase). Genotypes namely, IR4630-CSR11-175, CSR2748-171, CSR2748-4441-195, CSR2748-140 and CSRYET 7 exhibited 100, 100, 91, 91 and 90 per cent germination in anaerobic stress condition. These genotypes also enhanced α-amylase activity by 4.2 to 7.6 times and sucrose synthase activities by 3.2 to 4.8 times under anaerobic condition over aerobic condition. These enzymatic activates were positively correlated with germination percentage, seedling vigor, shoot and root length under anaerobic stress condition. The findings highlight the importance of carbohydrate metabolism in anaerobic germination. These identified promising genotypes (IR4630-CSR11-175, CSR2748-171, CSR2748-4441-195, CSR2748-140 and CSRYET 7) helps for breeding programs aimed at improving DSR adaptability. These genotypes represent valuable genomic resources for integrating molecular approaches may further elucidate the genetic basis of anaerobic germination tolerance.