caa a22 4500 477133851 CHVBK 20180405111712.0 cr unu---uuuuu 170330e19970101xx s 000 0 eng 10.1023/A:1002918119613 doi (NATIONALLICENCE)springer-10.1023/A:1002918119613 Genetic analysis of resistance to clubroot (Plasmodiophora brassicae) in Brassica oleracea. I. Analysis of symptom grades [Elektronische Daten] [Roeland Voorrips, H. Kanne] The inheritance of resistance to clubroot, caused by Plasmodiophora brassicae, in Brassica oleracea was studied in the F1, F2and backcross progenies of four crosses between resistant and susceptible doubled haploid lines. The disease severity was scored visually on a 0-3 scale of symptom grades. These were analyzed qualitatively and quantitatively. The qualitative analysis involved the conversion of symptom grades to a classification as resistant or susceptible, and segregation ratios were used to test several simple genetic models. The quantitative analysis was based on a threshold model, in which symptom grades are considered to arise from splitting a continuous response range into disjoint intervals. This analysis was based on the maximum likelihood method, and several genetic models were evaluated. Of the four resistances studied, one was shown to be largely determined by two complementary genes. Two other resistances were also shown to be probably controlled by two genes, but the mode of inheritance was not determined unambiguously. The fourth resistance appeared to be determined by more than two genes. Kluwer Academic Publishers, 1997 Brassica oleracea nationallicence disease resistance nationallicence genetics nationallicence ordinal data nationallicence Plasmodiophora brassicae nationallicence threshold model nationallicence clubroot nationallicence Voorrips Roeland Department of Vegetable and Fruit Crops, DLO - Centre for Plant Breeding and Reproduction Research(CPRO-DLO), 16, 6700, AA Wageningen, The Netherlands aut Kanne H. Department of Vegetable and Fruit Crops, DLO - Centre for Plant Breeding and Reproduction Research(CPRO-DLO), 16, 6700, AA Wageningen, The Netherlands aut Euphytica Kluwer Academic Publishers 93/1(1997-01-01), 31-39 0014-2336 93:1<31 1997 93 10681 https://doi.org/10.1023/A:1002918119613 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1023/A:1002918119613 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Voorrips Roeland Department of Vegetable and Fruit Crops, DLO - Centre for Plant Breeding and Reproduction Research(CPRO-DLO), 16, 6700, AA Wageningen, The Netherlands aut NATIONALLICENCE 700 1- Kanne H. Department of Vegetable and Fruit Crops, DLO - Centre for Plant Breeding and Reproduction Research(CPRO-DLO), 16, 6700, AA Wageningen, The Netherlands aut NATIONALLICENCE 773 0- Euphytica Kluwer Academic Publishers 93/1(1997-01-01), 31-39 0014-2336 93:1<31 1997 93 10681 Metadata rights reserved Springer special CC-BY-NC licence nationallicence SWISSBIB 477133851 BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer