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Acta Horticulturae Sinica ›› 2026, Vol. 53 ›› Issue (6): 1793-1802.doi: 10.16420/j.issn.0513-353x.2025-0433

• Plant Protection • Previous Articles     Next Articles

Establishment of Evaluation System and Screening of Resistant Sources for Fusarium Root Rot in Bottle Gourd Rootstock

LIU Jinqiu1, WEI Xiaoqian2, LIU Guang1, ZHANG Man1, YAO Xiefeng1, LOU Lina1, XU Jian1, ZHU Lingli1, HOU Qian1, XU Jinhua1,*()   

  1. 1 Jiangsu Key Laboratory for Horticultural Crop Genetic & ImprovementInstitute of Vegetable,Jiangsu Academy of Agricultural Sciences, Nanjing 210014, China
    2 Horticultural Science and Technology College of Suzhou Agricultural Vocational and Technical CollegeSuzhou, Jiangsu 215008, China
  • Received:2025-08-18 Revised:2026-03-09 Online:2026-06-24 Published:2026-06-24
  • Contact: XU Jinhua

Abstract:

To establish a precise system for identifying root rot resistance in bottle gourd rootstocks and enable efficient screening and evaluation of disease-resistant resources. This study utilized a Fusarium oxysporum strain causing root rot along with resistant and susceptible bottle gourd rootstock germplasms as experimental materials. The research clarified the pathogen’s host specificity and investigated the effects of inoculation methods,spore suspension concentrations,and environmental temperatures on the efficacy of seedling-stage resistance identification. Results showed that the pathogen exhibited no obvious host specificity,as it could infect multiple cucurbit crops including watermelon,bottle gourd,pumpkin,and melon. Among the three resistance identification methods tested,the root-dipping hydroponic method was optimal,with significantly superior performance in terms of disease onset time,disease index stability,and repeatability compared to the root irrigation and stem base injection methods. Under the conditions of a conidial suspension concentration of 1.2 × 107 spores · mL-1 and an environmental temperature of 20-25  ℃,root rot resistance identification could be completed 14 days post-inoculation. Using this optimized system,resistance assessment of 51 bottle gourd rootstock germplasms/varieties yielded 6 highly-resistant germplasms and 2 highly-resistant cultivars.

Key words: cucurbits, bottle gourd, rootstock, Fusarium oxysporum, root rot, resistance identification