The invention belongs to the technical field of cotton
disease resistance breeding and specifically relates to a cotton
verticillium wilt resistant
seedling stage identification method. The method provided by the invention comprises the following main steps of: firstly carrying out shaking culture on cotton
verticillium wilt germ 6SY2-37 collected in China Center for Type Culture Collection with the collection number being CCTCC NO: M2011095 in a Czapek's
liquid medium at the temperature of 25 DEG C for 5d, filtering by the use of gauze, counting by the use of a
blood cell counting panel, preparing 5*106
spore / ml, pulling up
seedling with a matrix when the water-planting cotton
seedling grows to a stage of two leaves and one core,
cutting 1cm of water root, dipping the root for 10s and inoculating, embedding wet soil into a plastic earthen bowl, inoculating
pathogen, immediately watering to prevent the cotton seedling from
fading, inoculating for 10 days and causing the
disease. The method provided by the invention has advantages of
high survival rate of the cotton seedling after
inoculation, uniform inoculated
pathogen, rapid morbidity, convenient operation and good stability of results. In addition, the method takes short time, requires short seedling growing time and is convenient to manage. Therefore, the method is suitable for cotton
verticillium wilt resistance identification and
pathogen pathogenicity differentiation determination of large-batch materials.