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<p>The whitebacked planthopper (WBPH), <i>Sogatella furcifera</i> (Horváth), is a major phloem-feeding pest of rice, causing significant yield losses across Asia. Exploiting wild rice germplasm offers an opportunity to identify novel resistance mechanisms against this pest. Seven <i>Oryza nivara</i> accessions—CR100318A, CR100327, IR104840, IR105409, IR82980, IR105808, and IR100916—along with the susceptible check TN1 and the resistant check Ptb33, were evaluated for antibiosis resistance capabilities and altered biochemical responses against WBPH during the wet seasons of 2023 and 2024. The study investigated key antibiosis resistance capabilities, including honeydew excretion, nymph emergence, survival, and growth index, alongside the altered activity and concentration of defense-related biochemical constituents such as phenylalanine ammonia lyase (PAL), tyrosine ammonia lyase (TAL), polyphenol oxidase (PPO), total phenols, flavonoids, ortho-dihydroxy phenols, total soluble sugars, reducing sugars, free amino acids, and soluble proteins. Among the tested accessions, IR105409 and CR100318A exhibited significantly lower honeydew excretion by WBPH, which may contribute to reduced phloem nutritional quality, indicating suppressed feeding activity by WBPH. The lowest WBPH nymph emergence was recorded from CR100327 and CR100318A, likely due to elevated PPO activity and reduced amino acid content. Furthermore, IR105409 showed reduced WBPH nymph survival and prolonged nymphal development, which were associated with elevated PAL and TAL activities in the accession, suggesting a strong biochemical basis for WBPH resistance.</p>

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Antibiosis resistance capabilities and altered biochemical responses of Oryza nivara accessions against Sogatella furcifera

  • 期刊论文

  • 发表日期：

    2026年7月21日

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  • Palak Gandhi,
  • Preetinder Singh Sarao,
  • Kamaljit Kaur

摘要

The whitebacked planthopper (WBPH), Sogatella furcifera (Horváth), is a major phloem-feeding pest of rice, causing significant yield losses across Asia. Exploiting wild rice germplasm offers an opportunity to identify novel resistance mechanisms against this pest. Seven Oryza nivara accessions—CR100318A, CR100327, IR104840, IR105409, IR82980, IR105808, and IR100916—along with the susceptible check TN1 and the resistant check Ptb33, were evaluated for antibiosis resistance capabilities and altered biochemical responses against WBPH during the wet seasons of 2023 and 2024. The study investigated key antibiosis resistance capabilities, including honeydew excretion, nymph emergence, survival, and growth index, alongside the altered activity and concentration of defense-related biochemical constituents such as phenylalanine ammonia lyase (PAL), tyrosine ammonia lyase (TAL), polyphenol oxidase (PPO), total phenols, flavonoids, ortho-dihydroxy phenols, total soluble sugars, reducing sugars, free amino acids, and soluble proteins. Among the tested accessions, IR105409 and CR100318A exhibited significantly lower honeydew excretion by WBPH, which may contribute to reduced phloem nutritional quality, indicating suppressed feeding activity by WBPH. The lowest WBPH nymph emergence was recorded from CR100327 and CR100318A, likely due to elevated PPO activity and reduced amino acid content. Furthermore, IR105409 showed reduced WBPH nymph survival and prolonged nymphal development, which were associated with elevated PAL and TAL activities in the accession, suggesting a strong biochemical basis for WBPH resistance.