Scholarlink

<p>The rice stem borer (<i>Chilo suppressalis</i>) is a major pest of cultivated rice in Asia. In the Yangtze River basin, the primary region of rice domestication, this insect maintains persistent populations on both cultivated rice (<i>Oryza sativa</i>) and on Manchurian wild rice (wild <i>Zizania latifolia</i>), an ancient perennial wetland grass. The evolutionary history of <i>Z. latifolia</i> (~ 3.9&#xa0;Ma) vastly predates rice domestication (~ 10,000–8,000 years BP), suggesting it served as the ancestral host before <i>C. suppressalis</i> colonized cultivated rice. To assess whether host-associated populations have diverged in key traits, we compared the overwintering biology of larvae collected from sympatric stands of both hosts across multiple paired sites. Population density on cultivated rice exceeded that on the wild host by more than fivefold and showed significant regional variation, which was absent in wild-host populations. Larval weight was ~ 30% lower on cultivated rice; frequency distributions were unimodal for rice-associated larvae versus bimodal for wild-host larvae, reflecting divergent overwintering age structures. Parasitism rates were consistently higher in rice-associated populations despite pesticide use. Pupation and eclosion were delayed by ~ 1 month on cultivated rice, synchronizing with rice’s later phenology. Mid-winter supercooling points did not differ, but by early spring rice-associated larvae had significantly lower supercooling points, consistent with delayed diapause termination. These pervasive differences reveal substantial host-associated phenotypic divergence. The patterns are consistent with strong selective pressures imposed by the agricultural environment, though distinguishing genetic adaptation from plasticity requires common garden and genomic analyses.</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

Phenological divergence in the rice stem borer correlates with rice domestication

  • 期刊论文

  • 发表日期：

    2026年5月22日

查看全文
  • Meng Wang,
  • Xiurou Mo,
  • Xinting Qiu,
  • Shiqing Yuan,
  • Yue Liu,
  • Xichen Xiao,
  • Meijuan Yang,
  • Yongmo Wang

摘要

The rice stem borer (Chilo suppressalis) is a major pest of cultivated rice in Asia. In the Yangtze River basin, the primary region of rice domestication, this insect maintains persistent populations on both cultivated rice (Oryza sativa) and on Manchurian wild rice (wild Zizania latifolia), an ancient perennial wetland grass. The evolutionary history of Z. latifolia (~ 3.9 Ma) vastly predates rice domestication (~ 10,000–8,000 years BP), suggesting it served as the ancestral host before C. suppressalis colonized cultivated rice. To assess whether host-associated populations have diverged in key traits, we compared the overwintering biology of larvae collected from sympatric stands of both hosts across multiple paired sites. Population density on cultivated rice exceeded that on the wild host by more than fivefold and showed significant regional variation, which was absent in wild-host populations. Larval weight was ~ 30% lower on cultivated rice; frequency distributions were unimodal for rice-associated larvae versus bimodal for wild-host larvae, reflecting divergent overwintering age structures. Parasitism rates were consistently higher in rice-associated populations despite pesticide use. Pupation and eclosion were delayed by ~ 1 month on cultivated rice, synchronizing with rice’s later phenology. Mid-winter supercooling points did not differ, but by early spring rice-associated larvae had significantly lower supercooling points, consistent with delayed diapause termination. These pervasive differences reveal substantial host-associated phenotypic divergence. The patterns are consistent with strong selective pressures imposed by the agricultural environment, though distinguishing genetic adaptation from plasticity requires common garden and genomic analyses.