Scholarlink

<p>Host plant resistance (HPR) is an eco-friendly approach to manage insect pests in crops. This approach involves the use of biophysical and morphological traits that deter or reduce insect feeding and reproduction. These traits affect plant–insect interactions through the production of secondary metabolites and volatiles, which can modify insect feeding behaviour and physiology. HPR also lead to increased activity of natural enemies and reduction in pesticide residues in food. In the present study, 252 local landraces of rice rice (<i>Oryza sativa</i> L.) were evaluated in natural field conditions during Summer 2024, aiming to identify the significant biophysical and morphological traits conferring resistance to yellow stem borer (YSB), <i>Scirpophaga incertulas</i>. Each land races of rice were screened for key biophysical and morphological traits. The incidence of yellow stem borer was recorded through incidence level of dead heart and white ear formation by the larvae, and egg mass deposition at different days after transplanting by the adults. The results revealed a significant and consistent negative association between plant height, longer and narrower leaves, more erect leaf angles, thinner stems, and higher leaf trichome density with yellow stem borer infestation. While, susceptible land races of rice with broader leaves, wider leaf angles, thicker stems, and lower pubescence recorded higher infestation of stem borer. The length of third leaf, flag leaf angle, and number of tillers were found crucial for resistance in early growth stages, while flag leaf width and third leaf length dominated in mid-tillering stage, and stem diameter with upper leaf pubescence were critical at the reproductive stage. Further, the correlation and principle component analyses highlighted the importance of multiple interacting biophysical traits particularly flag leaf length, third leaf length, stem diameter, leaf angles, and pubescence in governing resistance, indicating that no single trait alone determines tolerance to rice yellow stemborer. These findings provide insights to integrate the significant plant morphological traits to breed yellow stem borer resistant varieties for sustainable rice yields, and to reduce dependency on synthetic chemical insecticides.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Biophysical basis and morphological traits conferring resistance to yellow stem borer, Scirpophaga incertulas (walker) in land races of rice (Oryza sativa L.)

  • 期刊论文

  • 发表日期：

    2026年4月8日

查看全文
  • Divya D. Mallesh,
  • Vijaykumar Lingaraj,
  • B. Shivanna,
  • Reddy C. N. Lakshminarayana,
  • M. S. Kitturmath,
  • H. R. Raveendra,
  • K. R. Ashoka

摘要

Host plant resistance (HPR) is an eco-friendly approach to manage insect pests in crops. This approach involves the use of biophysical and morphological traits that deter or reduce insect feeding and reproduction. These traits affect plant–insect interactions through the production of secondary metabolites and volatiles, which can modify insect feeding behaviour and physiology. HPR also lead to increased activity of natural enemies and reduction in pesticide residues in food. In the present study, 252 local landraces of rice rice (Oryza sativa L.) were evaluated in natural field conditions during Summer 2024, aiming to identify the significant biophysical and morphological traits conferring resistance to yellow stem borer (YSB), Scirpophaga incertulas. Each land races of rice were screened for key biophysical and morphological traits. The incidence of yellow stem borer was recorded through incidence level of dead heart and white ear formation by the larvae, and egg mass deposition at different days after transplanting by the adults. The results revealed a significant and consistent negative association between plant height, longer and narrower leaves, more erect leaf angles, thinner stems, and higher leaf trichome density with yellow stem borer infestation. While, susceptible land races of rice with broader leaves, wider leaf angles, thicker stems, and lower pubescence recorded higher infestation of stem borer. The length of third leaf, flag leaf angle, and number of tillers were found crucial for resistance in early growth stages, while flag leaf width and third leaf length dominated in mid-tillering stage, and stem diameter with upper leaf pubescence were critical at the reproductive stage. Further, the correlation and principle component analyses highlighted the importance of multiple interacting biophysical traits particularly flag leaf length, third leaf length, stem diameter, leaf angles, and pubescence in governing resistance, indicating that no single trait alone determines tolerance to rice yellow stemborer. These findings provide insights to integrate the significant plant morphological traits to breed yellow stem borer resistant varieties for sustainable rice yields, and to reduce dependency on synthetic chemical insecticides.