<p>The whitefly <i>Bemisia tabaci</i> biotype B or MEAM1 highlights as the primary pest of common beans (<i>Phaseolus vulgaris</i> L.) in many countries. Landrace varieties have wide genetic variability, and thus can serve as important sources of resistance genes against insect pests. This study evaluated seven bean landrace varieties from southern Brazil compared to the commercial cultivar BRS Pérola for the resistance to the whitefly <i>B. tabaci</i>. Two experiments were carried out, where the bean varieties were assessed for the resistance by antixenosis in dual-choice oviposition preference assays and by antixenosis/antibiosis under no-choice condition with the highlighted varieties. All landrace varieties were less preferred by whitefly in binary comparisons with BRS Pérola, but they did not differ from each other. In the no-choice assay, Bainha Roxa was ~ 60% less oviposited than BRS Pérola and Uirapuru, but none of the genotypes affected the ensuing nymphal development of <i>B. tabaci</i>. Based on the results, the landrace variety Bainha Roxa showed moderate level of antixenosis-resistance to whitefly, but it did not express antibiosis. These findings can benefit programs of genetic breeding and integrated pest management, since the landrace Bainha Roxa can serve as gene donor for the improvement of commercial bean cultivars with antixenosis-resistance to the whitefly <i>B. tabaci</i>.</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

Resistance in common bean landrace varieties to Bemisia tabaci

  • Gustavo C. C. Gomes,
  • Bruno H. S. Souza,
  • Fernanda S. Ferreira,
  • Larah M. Freitas

摘要

The whitefly Bemisia tabaci biotype B or MEAM1 highlights as the primary pest of common beans (Phaseolus vulgaris L.) in many countries. Landrace varieties have wide genetic variability, and thus can serve as important sources of resistance genes against insect pests. This study evaluated seven bean landrace varieties from southern Brazil compared to the commercial cultivar BRS Pérola for the resistance to the whitefly B. tabaci. Two experiments were carried out, where the bean varieties were assessed for the resistance by antixenosis in dual-choice oviposition preference assays and by antixenosis/antibiosis under no-choice condition with the highlighted varieties. All landrace varieties were less preferred by whitefly in binary comparisons with BRS Pérola, but they did not differ from each other. In the no-choice assay, Bainha Roxa was ~ 60% less oviposited than BRS Pérola and Uirapuru, but none of the genotypes affected the ensuing nymphal development of B. tabaci. Based on the results, the landrace variety Bainha Roxa showed moderate level of antixenosis-resistance to whitefly, but it did not express antibiosis. These findings can benefit programs of genetic breeding and integrated pest management, since the landrace Bainha Roxa can serve as gene donor for the improvement of commercial bean cultivars with antixenosis-resistance to the whitefly B. tabaci.