Plant tissue colonization by the fungus race 1.2 of Fusarium oxysporum f.sp. melonis in resistant melon genotypes.

摘要

Four melon accessions; 'Shiroubi Okayoma', 'C-211', 'K.N.M' and 'BG-5384', resistant to race 1.2 of Fusarium oxysporum f.sp. melonis and a susceptible one 'Piel de Sapo' were tested to see which hypocotyl regions were invaded by the fungus, and to examine the relationship between resistance and presence of the pathogen in the plant tissue. While the fungus was shown to colonize all stem segments (either the upper, middle, or lower hypocotyl) of the susceptible and resistant plant accession, colonization was markedly lower in the resistant plants.