Asparagus is especially suitable for polyploidy breeding. The aim is to develop clone-based hybrid varieties, in particular male 4x varieties. For this purpose, genetically divergent diploid idiotypes") are subjected to mitotic or meiotic polyploidization. In developing hybrid partners, special attention is paid to resistance in addition to yield and quality characters. Early diagnoses are apphed in selection so as to shorten breeding times. Somaclonal variations may occur relatively often on in vitro propagation; these need to be eliminated. Triplex and quadruplex type males are suitable for paternal hybrid partners. Strong inbreeding depressions need to be avoided in their production.
Zur Früherkennung der Anfälligkeit von Genotypen des Spargels (Asparagus officinalis L.) gegenüber bodenbürtigen Pilzparasiten der Gattungen Fusarium und Pythium wurde eine einfach zu handhabende Methode erprobt. Dabei wird natürlicher Boden eines mit Pilzparasiten kontaminierten Befallsstandortes des Spargels im Gewächshaus in Plastikschalen gefüllt. Darin werden vorgekeimte Samen verschiedener Spargelsorten ausgelegt. Der Befall der aus ihnen hervorgehenden Spargeljungpflanzen wird symptomatologisch über 6 Wochen registriert. Die Ergebnisse ließen erkennen, daß sich die Sorten 'Ramada', 'Ravel' und 'Eposs' signifikant von der Sorte 'Schneekopf' durch geringeren Befall unterscheiden. Diese Bewertungen entsprechen langjährigen Beobachtungen in Spargelanlagen im Freiland. Die Methode scheint sich zur Vorselektion von Zuchtmaterial im Hinblick auf die Anfälligkeit von Spargelgenotypen gegenüber bodenbürtigen Pilzparasiten zu eignen. Schlüsselwörter: Bodenbürtige Pilzparasiten; Resistenz; Spargel On the Testing of the Susceptibility of Asparagus Cultivars to Soil Borne Fungous Parasites A simple method was investigated for early diagnosis of susceptibility of asparagus (Asparagus officinalis L.) genotypes to soil borne parasitic fungi of the genera Fusarium und Pythium. Soil samples from a contaminated asparagus field were put into plastic dishes in the greenhouse. Germinated asparagus seeds of different cultivars were planted *Corresponding author. 229 Downloaded by [University of Otago] at 23:06 25 December 2014 230 H. KEGLER et al.into the soil and the fungal infestation was symptomatologically recorded over a period of about 6 weeks. The results demonstrated that the cultivars 'Ramada', 'Ravel' and 'Eposs' showed a significant lower infestation by soil borne fungi than the susceptible cultivar 'Schneekopf'. The evaluations aggree with long time observations of asparagus cultivars in the field. This method seems to be suitable for screening and preselection of asparagus breeding material in regard of the susceptibility to soil borne fungi.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.