caa a22 4500 477133983 CHVBK 20180405111712.0 cr unu---uuuuu 170330e19970101xx s 000 0 eng 10.1023/A:1002970103683 doi (NATIONALLICENCE)springer-10.1023/A:1002970103683 Genetic analysis of resistance to clubroot (Plasmodiophora brassicae) in Brassica oleracea. II. Quantitative analysis of root symptom measurements [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 three crosses between resistant and susceptible doubled haploid lines. Fresh weights of affected (CW) and healthy (HRW) parts of the root system were measured and R = ln((HRW+0.5)/(CW+0.5)) was used as a measure of resistance. R was shown to have a normally distributed error term with a constant standard deviation over the entire scale. Analysis of means indicated the presence of two complementary resistance genes in one of the crosses. In the other two crosses analysis of means also indicated two-locus interactions, in these cases reducing the cumulative effects of loci homozygous for resistance or for susceptibility alleles. The numbers of segregating resistance genes in these two crosses could not be determined. The presence of epistatic interactions precluded analysis of variance; therefore in this case the measurements were not more informative than the symptom grades analyzed in a previous study. R showed a high rank correlation (-0.85) with symptom grades assigned to the same plants. The results of genetic analyses of R were generally in agreement with those obtained earlier using symptom grades. Symptom grades can therefore be regarded as a reliable measure of symptom development, despite their more subjective nature. Kluwer Academic Publishers, 1997 analysis of means nationallicence Brassica oleracea nationallicence disease resistance nationallicence doubled haploids nationallicence epistasis nationallicence genetics nationallicence Plasmodiophora brassicae 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), 41-48 0014-2336 93:1<41 1997 93 10681 https://doi.org/10.1023/A:1002970103683 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1023/A:1002970103683 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), 41-48 0014-2336 93:1<41 1997 93 10681 Metadata rights reserved Springer special CC-BY-NC licence nationallicence SWISSBIB 477133851 BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer