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Published in Crop Sci 15:867-868 (1975)
© 1975 Crop Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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Gray Leaf Spot-Resistant Lupinus Angustifolius L. Germplasm from Plant Exploration in the Western Mediterranean Region1

Ian Forbes, John S. Gladstones and Homer D. Wells2

During a plant exploration in the western Mediterranean region in 1973, seeds of wild blue lupine (Lupinus angustifolius L.) ecotypes were collected from 126 sites to increase the amount of germplasm available for blue lupine crop breeding in the United States and Western Australia. These ecotypes were tested for gray leaf spot reactions by artificial inoculation with mixed inoculum from Stemphylium solani Weber and S. botryosum Wallr. in the greenhouse. High percentages of the wild ecotypes from Morocco—81.8%, Spain—70.8%, and Portugal—66.7% were resistant. These data and other reports of resistant wild ecotypes from Portugal, Spain, and Palestine indicate that resistance is widespread and prevalent among wild ecotypes in the Mediterranean basin, which comprises L. angustifolius' natural range. The Stemphylium species that cause gray leaf spot occur in the Mediterranean region and are probably active in preserving host genes for resistance. One ecotype from Morocco gave a previously unknown, intermediate (I-type) flecklike reaction when inoculated. This reaction differs from the immune reaction conditioned by the known gl1 and gl2 host genes. The identity, country of origin, and disease reaction of each ecotype are listed.

Key Words: Blue lupine • Narrow-leafed lupine • Stemphylium solani Weber • Stemphylium botryosum Wallr.

1 Cooperative investigations of ARS, USDA, and the Univ. of Georgia College of Agric. Exp. Stn., Coastal Plain Stn., Tifton, GA 31794, and the Wheat and Sheep Division, Western Australia Dep. of Agriculture, South Perth, Western Australia 6151.

2 Research agronomist, ARS-USDA, Georgia Coastal Plain Exp. Stn., Tifton, GA 31794; senior plant breeder, W & SD, WA Dep. of Agric., South Perth, Western Australia 6151; and research plant pathologist, ARS-USDA, Georgia Coastal Plain Exp. Stn., Tifton, GA 31794.

Received for publication January 5, 1975.




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