Lothar Frese

Learn More
Forty-one accessions of the genusBeta representing wild and cultivated species of all sections were analyzed by DNA “fingerprinting”. Four sugar beet minisatellite DNA probes revealed characteristic banding patterns with Southern-hybridizedBeta DNA restricted withHindIII. A total of 111 polymorphic RFLP bands were scored across all accessions. Cluster(More)
Between 580 and 700 accessions of related cultivated and wild species of the genus Beta were assessed for resistance to four soil-borne diseases of sugar beet: two seedling damping-off diseases caused by the fungi Aphanomyces cochlioides and Pythium ultimum and two diseases of more mature plants, Rhizoctonia root and crown rot, caused by the fungus R.(More)
Resistance to four foliar diseases of sugar beet (Beta vulgaris ssp. vulgaris), virus yellows caused by Beet mild yellowing virus (BMYV) and Beet yellows virus (BYV), powdery mildew (Erysiphe betae) and Cercospora leaf spot (Cercospora beticola), was assessed in up to 600 accessions of closely related wild and cultivated Beta species. Most accessions were(More)
The expression of self-incompatibility (SI) rejection patterns in 29 accessions of wildBeta species was studied at the anatomical level. Three different SI-related pollen tube rejection patterns were observed: (1) The pollen germinate from many pores and the pollen tubes are very short, often with swollen tips. (2) The pollen germinate and grow along the(More)
The taxonomic histories of the genus Beta and of section Beta within this genus are summarised. The subdivision of the genus agrees largely with (im)possibilities to produce hybrids. Classification within section Beta has been very variable, with examples of overclassification and severe lumping of taxa. The present study includes a morphometric analysis of(More)
Conservation of the genetic resources of sugar beet has been considered a task of genebanks which collect, reproduce and preserve seed samples under cold storage conditions ex situ. Arguments are provided why the ex situ conservation of beet germplasm may not be fully sufficient to maintain the genetic diversity of beet genetic resources on the long run.(More)
Interspecific relationship among wild beets in section Corollinae was analyzed. Isozyme allele composition supports the concept of three basic species consisting of two diploid species, Beta lomatogona and Beta macrorhiza and the tetraploid species, Beta corolliflora. The polyploid and apomictic species referred to as Beta trigyna and Beta intermedia were(More)
In this paper the variation pattern of the Sicilian Beta germplasm collection is analysed. Accessions from Sicily were grown under controlled conditions and were evaluated morphometrically. Geographical distribution patterns of morphological characters are identified and the putative classification of the collection into coastal and inland populations is(More)
In the present study diversity in a collection of the Garden Beet Group,consisting of 40 accessions from the BAZ Gene Bank and Polish cultivars, was evaluated in a two-year field trial. Thirteen morphological and yield traits were evaluated as well as content of betanin, vulgaxanthine, sugars, and nitrates in root tissue. The study revealed that accessions(More)
The objective of this study was to contribute to a better understanding of the variation pattern in leaf beets. 42 biennial samples from a total of 74 entries were described by 17 characters. A group of presumably less selected leaf beets (group A) with narrow petioles was separated from more advanced cultivars by single linkage cluster (SLCA) and principal(More)