Optimal allocation of resources in evaluating current sunflower inbred lines for resistance to Sclerotinia |
| |
| Authors: | J Degener A E Melchinger V Hahn |
| |
| Institution: | Landessaatzuchtanstalt (720). Universität Hohenheim. D-70593 Stuttgart, Germany;Institut für Pflanzenzüchtung, Saatgutforschung und Populationsgenetik (350), Universität Hohenheim. D-70593 Stuttgart. Germany |
| |
| Abstract: | Sclerotinia sclerotiorum (Lib.) de Bary is a major limiting factor for sunflower (Helianthus annuus) production. This study was conducted to (1) evaluate a large number of current sunflower lines for their reaction to Sclerotinia, and (2) determine the optimum allocation of resources for their selection. A set of 85 inbred lines was screened under artificial leaf infection in three environments. The test revealed ample variation for all resistance traits in the current germplasm. A line selected from NDBLOS, an oilseed sunflower germplasm poo, and its derivatives were most resistant to Sclerotinia. Lines derived from interspecific crosses with the wild species Helianthus tuberosus and Helianthus argophyllus also showed satisfactory Sclerotinia resistance. The evaluation of five plants per plot in two replications and four environments appears to be a reasonable allocation of resources in order to optimize the selection response. |
| |
| Keywords: | Helianthus annuus Sclerotinia sclerotiorum artificial infection heritability optimal allocation of resources selection response |
|
