Czech Journal of Genetics and Plant Breeding, 2003 (vol. 39), issue 1
Morphological Variability and Isozyme Polymorphisms in Maca and Yacon
A. Lebeda, I. Doležalová, M. Dziechciarková, K. Doležal, J. Frček
Czech J. Genet. Plant Breed., 2003, 39(1):1-8 | DOI: 10.17221/3714-CJGPB 
A set of 15 accessions of maca, Lepidium meyenii Walp., and 25 accessions of yacon, Smallanthus sonchifolius (Poepp. & Endl.) H. Robins., cultivated under Czech field conditions was studied to determine relationships between morphological variability and isozyme polymorphisms. Morphological characterisation of maca included evaluation of length, weight, shape, skin and flesh colour of hypocotyls. In yacon, we evaluated shape, colour, skin texture and flesh colour of tubers, as well as the number of roots. Preliminary results showed that maca forms low-weight hypocotyls (up to only 17.4 g) under Czech field conditions. For yacon,...
Effect of Genotype and Explant Type on Shoot Regeneration in Tomato (Lycopersicon esculentum Mill.) in vitro
J. Gubiš, Z. Lajchová, J. Faragó, Z. Jureková
Czech J. Genet. Plant Breed., 2003, 39(1):9-14 | DOI: 10.17221/3715-CJGPB
The regeneration capacity of six types of explants (segments from hypocotyl, cotyledons, epicotyl, leaf, internodes and petiole) was compared in 13 cultivars of tomato (Lycopersicon esculentum Mill). Explants were cultured on a regeneration medium containing 1 mg/l zeatin and 0.1 mg/l indole-3-acetic acid. The number of shoot primordia and shoots with 1 or more fully developed leaves was evaluated after 6 weeks. The regeneration capacity was significantly influenced by cultivars and explant types. The total number of shoot primordia produced in all types of explants was highest in the cultivars Hana and Premium and lowest in UC 82 and Money...
Resistance of Maize Inbreds and their Hybrids to Fusarium Stalk Rot
T. Ledečan, D. Šumić, I. Brkić, A. Jambrović, Z. Zdunić
Czech J. Genet. Plant Breed., 2003, 39(1):15-20 | DOI: 10.17221/3716-CJGPB
The resistance of 35 inbred lines and their 70 hybrids with two testers to stalk rot is described and the results of natural and artificial stalk infection are compared. A mixture of Fusarium spp. spores was used for artificial infections. The disease was scored for two years. Inbreds and hybrids differed significantly in resistance and infection types in both years. Generally, disease scores of hybrids were lower than of inbreds. No close association was found between lines and their testcross hybrids (r = -0.06 to 0.29) and between hybrids with the two testers (r = -0.04 to 0.38). The correlation coefficients of disease...
Resistance to Diseases in Wheat Collection Samples and Somaclonal Variants
L.G. Tyryshkin, N.A. Tyryshkina
Czech J. Genet. Plant Breed., 2003, 39(1):21-23 | DOI: 10.17221/3717-CJGPB
More than 2000 wheat collection samples were studied for seedling resistance to 4 diseases. Noncoincidence of results obtained after inoculation of leaf segments placed on water solution of benzimidazole (60 ppm) and intact plants was found for 3 foliar diseases (leaf rust - Puccinia recondita, dark brown leaf spot blotch - Bipolaris sorokiniana and septoria glume blotch - Septoria nodorum). Sixty-three entries were resistant to leaf rust; 26 of them have gene for resistance Lr26 (non-effective under field condition), 25 - gene Lr24, 4 - gene Lr19, 8 - gene Lr9 and 2 - gene Lr41....
The Czech-Slovak Workshop: Utilization of Molecular Markers in Plant Biology, Plant Breeding and Conservation of Plant Genetic Resources (Šumperk, 4th-6th November 2002)
M. Griga
Czech J. Genet. Plant Breed., 2003, 39(1):24 | DOI: 10.17221/6096-CJGPB
Spring wheat variety Zuzana
A. Hanišová, P. Horčička
Czech J. Genet. Plant Breed., 2003, 39(1):25-26 | DOI: 10.17221/6097-CJGPB
Spring barley Respekt
M. Špunarová
Czech J. Genet. Plant Breed., 2003, 39(1):27-28 | DOI: 10.17221/6098-CJGPB
Pea variety Herold
J. Kreuzman, R. Drdla, P. Liška
Czech J. Genet. Plant Breed., 2003, 39(1):29-30 | DOI: 10.17221/6099-CJGPB