Regional variation in Brassica nigra and other weedy crucifers for disease reaction to Alternaria brassicicola and Xanthomonas campestris pv. campestris |
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| Authors: | Anne L Westman Stephen Kresovich Michael H Dickson |
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| Institution: | (1) Department of Biological Sciences, Clemson University, 132 Long Hall, Clemson, South Carolina, 29634, U.S.A;(2) Department of Plant Breeding, Cornell University, 158 Biotechnology Building, Ithaca, New York, 14853, U.S.A;(3) Horticulture Department, Cornell University, 302 Hedrick Hall, Geneva, New York, 14456, U.S.A |
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| Abstract: | For Brassica crop breeders, weedy crucifers are potential sources of disease resistance and other useful traits. However,
few species have been evaluated or are well represented in germplasm collections. In this study, we evaluated 24 Eurasian
crucifer species for disease reaction to North American isolates of the crop pathogens A. brassicicola and X. campestris pv.
campestris. The test array comprised 190 entries (genebank accessions and weed populations), including 108 B. nigra entries
from four geographic regions and 34 entries of Camelina sativa. Disease reaction was highly variable between species and within
some species. Reaction to A. brassicicola was variable between entries of C. sativa, a species reported as highly resistant
to Alternaria pathogens. In B. nigra, disease reaction was variable between geographic regions and between entries within
some regions. Most of the B. nigra entries rated as disease resistant were weed populations from North America, but disease
reaction was not related to the geographic distance between these populations. In summary, disease reaction to two crop pathogens
was variable in crucifer weed taxa, including species considered to contain little genetic variation. We identified entries
with promising levels of disease resistance and highlighted the potential value of weedy crucifer genetic resources.
This revised version was published online in July 2006 with corrections to the Cover Date. |
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| Keywords: | black rot crop relatives geographic variation introduced weeds leaf spot mustard |
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