caa a22 4500 477134025 CHVBK 20180405111712.0 cr unu---uuuuu 170330e19970201xx s 000 0 eng 10.1023/A:1002900717062 doi (NATIONALLICENCE)springer-10.1023/A:1002900717062 Genetical studies of resistance to Phytophthora porri in Allium porrum, using a new early screening method [Elektronische Daten] [W.D. Smilde, M. van Nes, K. Reinink, C. Kik] A new screening method was developed to evaluate resistance of leek (Allium porrum) to Phytophthora porri, based on inoculation by 24 h-immersion of leek plantlets in the 3-6 leaf stage in a suspension of ca. 100 zoospores.ml-1. The immersion test was used for identifying new sources of resistance and to determine the genetic basis of resistance. Within winter leek, five resistance classes were defined on the basis of average field scores of 21 plants. Clones from these plants were tested with the immersion technique. The average scores per resistance class in immersion and field tests were significantly correlated (P<0.01). The correlation of single-date field scores with the immersion test scores was better in the second half of the epidemic season. A selection experiment yielded a strong response to selection for resistance (53-97%) but no response to selection for susceptibility. This may indicate that resistance is due to few recessive genes in the studied winter leek. Crosses between landraces and winter leek were analyzed by means of F2 (selfed F1) and BC1, progenies. This analysis indicated the presence of few loci with dominant genes for resistance in accession CGN 873243, and additive polygenes in accession Pl 368351. Kluwer Academic Publishers, 1997 Allium porrum nationallicence autotetraploidy nationallicence introgression nationallicence Phytophthora porri nationallicence resistance nationallicence screening methods nationallicence leek nationallicence Smilde W.D. Department of Vegetable and Fruit Crops, DLO-Centre for Plant Breeding and Reproduction Research (CPRO-DLO), P.O. Box 16, 6700 AA, Wageningen, The Netherlands aut van Nes M. Department of Vegetable and Fruit Crops, DLO-Centre for Plant Breeding and Reproduction Research (CPRO-DLO), P.O. Box 16, 6700 AA, Wageningen, The Netherlands aut Reinink K. Department of Vegetable and Fruit Crops, DLO-Centre for Plant Breeding and Reproduction Research (CPRO-DLO), P.O. Box 16, 6700 AA, Wageningen, The Netherlands aut Kik C. Department of Vegetable and Fruit Crops, DLO-Centre for Plant Breeding and Reproduction Research (CPRO-DLO), P.O. Box 16, 6700 AA, Wageningen, The Netherlands aut Euphytica Kluwer Academic Publishers 93/3(1997-02-01), 345-352 0014-2336 93:3<345 1997 93 10681 https://doi.org/10.1023/A:1002900717062 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1023/A:1002900717062 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Smilde W.D. Department of Vegetable and Fruit Crops, DLO-Centre for Plant Breeding and Reproduction Research (CPRO-DLO), P.O. Box 16, 6700 AA, Wageningen, The Netherlands aut NATIONALLICENCE 700 1- van Nes M. Department of Vegetable and Fruit Crops, DLO-Centre for Plant Breeding and Reproduction Research (CPRO-DLO), P.O. Box 16, 6700 AA, Wageningen, The Netherlands aut NATIONALLICENCE 700 1- Reinink K. Department of Vegetable and Fruit Crops, DLO-Centre for Plant Breeding and Reproduction Research (CPRO-DLO), P.O. Box 16, 6700 AA, Wageningen, The Netherlands aut NATIONALLICENCE 700 1- Kik C. Department of Vegetable and Fruit Crops, DLO-Centre for Plant Breeding and Reproduction Research (CPRO-DLO), P.O. Box 16, 6700 AA, Wageningen, The Netherlands aut NATIONALLICENCE 773 0- Euphytica Kluwer Academic Publishers 93/3(1997-02-01), 345-352 0014-2336 93:3<345 1997 93 10681 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer