Segregation distortion of Brassica carinata derived black rot resistance in Brassica oleracea |
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| Authors: | Muhammet Tonguç Elizabeth D Earle Phillip D Griffiths |
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| Institution: | (1) Department of Horticultural Sciences, Cornell University NYSAES, Geneva, N.Y, 14456, U.S.A;(2) Department of Plant Breeding, Cornell University, 514 Bradfield Hall Ithaca, N.Y. 14853, U.S.A |
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| Abstract: | Three segregating F2 populations were developed by self-pollinating 3 black rot resistant F1 plants, derived from across between black rot resistant parent line 11B-1-12 and the susceptible cauliflower cultivar ‘Snow
Ball’. Plants were wound inoculated using 4 isolates ofXanthomonas campestris pv. campestris (Xcc) race 4, and disease severity ratings of F2 plants from the three populations were scored. A total of 860 arbitrary oligonucleotide primers were used to amplify DNA
from black rot resistant and susceptible F2 plants and bulks. Eight RAPD markers amplified fragments associated with completely disease free plants following black rot
inoculation,which segregated in frequencies far lower than expected. Segregation of markers with black rot resistance indicates
that a single, dominant major gene controls black rot resistance in these plants. Stability of this black rot resistance gene
in populations derived from 11B-1-12 may complicate introgression into B. oleracea genotypes for hybrid production.
This revised version was published online in July 2006 with corrections to the Cover Date. |
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| Keywords: | cabbage Ethiopian mustard RAPD Xanthomonas campestris |
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