Population genomics reveals population structure and local adaptation of the Helicoverpa armigera lineage in Xinjiang, China

作者：Bofeng Hou, Yanjun Cai, Jianpeng Zhang, John G. Oakeshott, Yidong Wu · 发表于：Pest Management Science · 年份：2025 · DOI：10.1002/ps.8803 · 被引用次数：7 · 研究领域：Insect Resistance and Genetics、Research in Cotton Cultivation、Insect-Plant Interactions and Control

BACKGROUND: The cotton bollworm, Helicoverpa armigera, is a global pest of many crops, particularly cotton. Populations in Xinjiang (north-western China) are distinct from other major lineages in eastern China and elsewhere. Cotton is grown in Xinjiang in a wide range of climatic conditions but little is known about H. armigera population structure and gene exchange, either within Xinjiang or between it and the eastern China populations. RESULTS: Population structure analyses showed significant gene flow throughout Xinjiang but the western-most collections, Kashi and Shawan, were the most divergent, both from each other and from the other collections. Demographic history dynamics revealed a peak in ancestral population size for Xinjiang populations during a relatively warm and humid period about 5000-10 000 years ago. Selective sweep analyses found local adaptation of genes in Kashi including several CYP9A genes and two trehalose transport 1 (Tret1) genes, and genes in Shawan including several CYP6AE genes plus the basic juvenile hormone-suppressible protein 1 gene (BJSP-1) and two Methuselah genes. Spikes of introgression including the cyc, tim and per genes related to circadian rhythm were also detected between Kashi and/or Shawan and other Xinjiang populations. CONCLUSION: Helicoverpa armigera from Shawan and Kashi are genetically differentiated from each other and from other Xinjiang populations at the whole-genome level. Despite some evidence of introgression, they also ...