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.Please view the pdf by using the Full Text (PDF) link under 'View' to the left.
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