Studies on the Inheritance of Resistance toFusarium oxysporumf. sp.apiiin Celery

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Abstract
Fusarium yellows, incited by F. oxysporum f. sp. apii, is currently the most important disease of celery (A. graveolens L.) in North America. Experiments were conducted to elucidate the inheritance of resistance to race 2 of the pathogen, which was observed previously in the celeriac line PI [plant introduction] 169001. F2 populations derived from a cross of this line with a putatively tolerant selection from the susceptible celery cv. Tall Utah 52-70R showed segregation of resistance and susceptibility. With 1 exception, F2 segregation ratios were between 3:1 and 15:1 resistant/susceptible. Results from progeny tests of 20 resistant F2 plants were consistent with the conclusion that resistance in PI 169001 was conditioned by a dominant allele at a single locus and that segregation distortion was caused by segregating genes with quantitative effects on resistance contributed by the selected ''Tall Utah 52-70R'' parent or both parents. The F2 segregation from a separate cross was also consistent with the hypothesis of a single dominant resistance gene and a quantitative resistance gene(s) in PI 169001.

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