Linkage of downy mildew resistance genes Pd
1 and Pd
2from Allium roylei Stearn in progeny of its interspecific hybrid with onion (A. cepa L.) |
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| Authors: | J N de Vries W A Wietsma M C Jongerius |
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| Institution: | (1) DLO-Centre for Plant Breeding and Reproduction Research CPRO-DLO, Droevendaalsesteeg 1, P.O. Box 16, NL-6700 AA Wageningen, The Netherlands;(2) Present address: Commodity Board for Ornamental Horticulture, P.O. Box 93099, NL-2509 AB Den Haag, The Netherlands |
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| Abstract: | Summary Male meiosis of the interspecific hybrid between Allium roylei and A. cepa is undisturbed relative to its parents. Based on meiotic data, A. roylei is concluded to be a closer relative of A. cepa than A. fistulosum. Segregation ratios for downy mildew resistance among BC1 and F2 progenies from the F1 between A. roylei and A. cepa indicate the presence of two dominantly inherited, weakly linked nuclear resistance genes, Pd
1 and Pd
2, in A. roylei (recombination frequency 0.32±0.03). Presumably Pd
1 and Pd
2are the first genes described in Allium residing in one linkage group. The prospects of exploiting A. roylei in onion breeding seem very promising. |
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| Keywords: | Allium cepa Allium roylei disease resistance interspecific crosses linkage groups onion breeding taxonomic relationships |
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