Common Antigen(s) in Cotton to Fusarium oxysporum f. sp. vasinfectum

Antigen-antibody reactions in agar gel, as demonstrated by the double diffusion technique, between cotton seed globulins and the antisera specific to each of the tested Fusarium oxysporum f. sp. vasinfectum isolates as well as the antiserum of F. moniliforme revealed that all the tested antisera of F. oxysporum f. sp. vasinfectum reacted with seed globulins except the Menoufi cultivar globulins. No precipitin lines were detected in the reaction between the antigenof the cotton cultivar Acala SJ2 versus the antiserum of P10 isolate. The 5 cultivars behaved differently with each fungal antiserum to the extent that they could be distinguished accordingly. When the seed globulins of the susceptible cultivars (Giza 74, and Bahtim 110) reacted with antiserum of the tested F. oxysporum f. sp. vasinfectum isolates, more precipitin lines were formed than the resistant cultivars. On the other hand, no obvious reaction was detected in case of F. moniliforme antiserum.