Summary
Fifty-eight lettuce cultivars were tested for their reaction to three races of downy mildew in Israel and to four races in the Netherlands. It was found that in these two countries at least seven different races exist. The inheritance of resistance to each race was established.
The resistance to each of six races (IL-2, IL-3, IL-4, NL-1, NL-3 and NL-4) is controlled by one dominant gene; only to race NL-2, control is by two dominant complementary genes. From the reaction of the various cultivars and their progeny, a genetic designation for host-parasite relationship is suggested.
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Contribution from the Agricultural Research Organization, the Volcani Center, Bet Dagan, Israel. 1973 Series, No 205-E.
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Globerson, D., Netzer, D. & Tjallingii, F. Mode of inheritance of resistance in lettuce (Lactuca sativa L.) to three Israeli and four Dutch races of downey mildew (Bremia lactucae reg.). Euphytica 23, 54–60 (1974). https://doi.org/10.1007/BF00032741
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DOI: https://doi.org/10.1007/BF00032741