Inheritance of Podosphaera xanthii resistance in melon line '90625'.

Abstract

Several races of Podosphaera xanthii have been described on melon. The\nIndian melon line ‘90625’ (PI 313970) which had already been described as resistant\nin the USA is a potential source of resistance for strains recently characterized in\nFrance. We have studied the inheritance of resistance in a Recombinant Inbred Line\npopulation between ‘Védrantais’ (susceptible) and ‘90625’ using a leaf disk technique\nwith 10 strains of P. xanthii. Potentially five genes could be present in ‘90625’. Two\nindependent semi-dominant genes (A and B) are involved in resistance to strains\n06Sm10 and S87-7 respectively. Resistance to the other strains seems to be under a\ndigenic control, including A and B or not, with three other recessive genes. Some of\nthese RILs could be used as additional differential lines for the characterization of the\nraces.