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<p>In the present study, <i>Fusarium</i> species, the incitant of collar rot associated yellowing in black pepper was identified and characterized adopting polyphasic approach. The disease was characterized by the symptoms including general decline in plant health, flaccidity, foliar yellowing followed by defoliation, necrosis of internal vasculature and collar region, collar rot and subsequent wilting of the vines and the severity was more pronounced during post-monsoon season. The isolates representing diverse black pepper cultivating tracts were initially identified as <i>Fusarium</i> species based on macro- and micro-morphological traits. Subsequent molecular analysis with internal transcribed spacer (ITS), partial elongation factor 1-alpha (<i>ef1-α</i>) and β-tubulin (<i>β-tub</i>) genes revealed the association of <i>Fusarium solani</i> and <i>F. equiseti</i>. Initial pathogenicity was proved by in vitro assay in which epinasty, collar rot and wilting occurred within 8–10 days. In the in planta assay, the symptoms observed were foliar yellowing followed by shriveling, drooping, vascular browning and wilting on injured and uninjured plants 20–25 and 55–65 days post-inoculation, respectively. The present study enunciated the association of <i>F. solani</i> and <i>F. equiseti</i> with collar rot associated yellowing of black pepper which warrant further investigations on its spatio-temporal distribution, pathogen diversity, weather-host-pathogen interaction and formulating prospective disease management strategies.</p>

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Identification and characterization of Fusarium species associated with collar rot and yellowing of black pepper (Piper nigrum L.)

  • 期刊论文

  • 发表日期：

    2026年2月17日

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  • C. N. Biju,
  • A. Jeevalatha,
  • M. F. Peeran,
  • A. R. Anusree,
  • C. S. Karthika,
  • K. S. Reshma,
  • S. J. Ankegowda,
  • C. Sellaperumal

摘要

In the present study, Fusarium species, the incitant of collar rot associated yellowing in black pepper was identified and characterized adopting polyphasic approach. The disease was characterized by the symptoms including general decline in plant health, flaccidity, foliar yellowing followed by defoliation, necrosis of internal vasculature and collar region, collar rot and subsequent wilting of the vines and the severity was more pronounced during post-monsoon season. The isolates representing diverse black pepper cultivating tracts were initially identified as Fusarium species based on macro- and micro-morphological traits. Subsequent molecular analysis with internal transcribed spacer (ITS), partial elongation factor 1-alpha (ef1-α) and β-tubulin (β-tub) genes revealed the association of Fusarium solani and F. equiseti. Initial pathogenicity was proved by in vitro assay in which epinasty, collar rot and wilting occurred within 8–10 days. In the in planta assay, the symptoms observed were foliar yellowing followed by shriveling, drooping, vascular browning and wilting on injured and uninjured plants 20–25 and 55–65 days post-inoculation, respectively. The present study enunciated the association of F. solani and F. equiseti with collar rot associated yellowing of black pepper which warrant further investigations on its spatio-temporal distribution, pathogen diversity, weather-host-pathogen interaction and formulating prospective disease management strategies.