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The Journal of Heredity 2002:93(4)
© 2002 The American Genetic Association 93:291-293

Brief Communication

Genomic Location of the Fw Gene for Resistance to Fusarium Wilt Race 1 in Peas

M. J. Grajal-Martìn, and F. J. Muehlbauer

From the Instituto Canario de Investigaciones Agrarias,Apartado 60, 38080 La Laguna, Tenerife, Spain (Grajal-Martìn) and USDA-ARS and the Department of Crop andSoil Sciences, Washington State University, Pullman,WA 99164-6434 (Muehlbauer).

Address correspondence to M. J. Grajal-Martìn at the address above.

Resistance to fusarium wilt in peas (Pisumsativum L.) caused by Fusarium oxysporum Schlect. f. sp. pisi race 1 (van Hall) Snyd. & Hans. is conferred by a single dominant gene, Fw. The gene was located in the pea genome by analyzing progenies from crosses involving genetic markers across all pea linkage groups. Phenotyping of the progenies for reaction to race 1 of the fusarium wilt pathogen was determined by field screening in a "wilt-sick" plot in Pullman, Washington. Fw wasshown to be located on linkage group III, about 13 map units from Lap-1 and b and 14 map units from Td. The relatively large distances between these markers and Fw precludes the use of the linked markers in marker-assisted selection for wilt resistance. Additional markers in this region ofthe pea genome will be required if marker-assisted selection for Fw is to be successful.


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