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The exploration of genetic resources of Portuguese cabbage and kale for resistance to several Brassica diseases |
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| Authors: | António A. Monteiro Paul H. Williams |
| Affiliation: | (1) Dept. of Horticulture, University of Wisconsin-Madison, 1575 Linden Dr., 53706 Madison, WI, U.S.A.;(2) Present address: Instituto Superior de Agronomia, Tapada da Ajuda, 1300 Lisboa, Portugal;(3) Dept. of Plant Pathology, University of Wisconsin-Madison, 1630 Linden Dr., 53706 Madison, WI, U.S.A. |
| Abstract: | Summary Twenty three accessions of nine Portuguese cabbage and kale land races from different geographic origins were tested at the seedling stage for resistance to several important brassica diseases. Resistance to downy mildew (Peronospora parasitica), expressed as necrosis of the cotyledon mesophyll, was found in all the accessions. Type A resistance to cabbage yellows (Fusarium oxysporum f. sp. conglutinans race 1) was present in most of the landraces. Resistance to clubroot (Plasmodiophora brassicae race 6) was found in one accession of the Portuguese tree kale. High resistance to blackleg (Leptosphaeria maculans) and white rust (Albuco candida) was not detected, although several accessions showed 20 to 30% of plants with intermediate expression of resistance. All Portuguese cole accessions were susceptible to blackrot (Xanthomonas campestris pv. campestris). |
| Keywords: | Brassica oleracea Portuguese cabbage Portuguese kale Albugo candida white rust Fusarium oxysporum fusarium yellows Leptosphaeria maculans blackleg Peronospora parasitica downy mildew Plasmodiophora brassicae clubroot Xanthomonas campestris blackrot disease resistance landraces variation |
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