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Study on an embryo culture of black currant hybrids obtained as a result of distant hybridisation

100%

Golis A. , Pluta S. , Zurawicz E.

Biotechnologia

2001

nr 2

66-71

The subjects of this study were embryos obtained from 22 crossing combinations in the course of distant hybridisation. No embryos were obtained from the following three interspecific hybridisations: Siewka K1 x Josta, Siewka K1 x Czereszniewa and Captivator x Josta. Seeds obtained from these combinations did not hold endosperm, but yielded watered liquid. In the remaining hybridisations, a high percentages of visible embryos increased considerably, especially at the torpedo-shaped stage. An addition of kinetin (1 mg/l) to the media had a better impact on plant regeneration from embryos than the addition of BA (0,5 mg/l). Dependending on the study, up to 83,7% of exposed embryos in the media started to grow and develop under the influence of kinetin.

Genetic and environmental correlation and path coefficient analysis of fruit yield per bush and other traits in black currants (Ribes nigrum L.)

88%

Madry W. , Pluta P. S. , Pluta S. , Zurawicz Z. E. , Zurawicz E.

Journal of Applied Genetics

2000

tom 41

nr 4

221-236

Twenty-five F1 hybrid families of black currants (Ribes nigrum L.) originating from diallel crosses of five cultivars were assessed. Phenotypic correlation coefficient between full-sib family means (rFS), genetic correlation coefficient between full-sib family expected values (rG) and the environmental correlation were estimated on the basis of two years of observations for 12 quantitative characteristics studied. Evident repeatability of correlations in both years was proved. A considerable consistence between the values of genetic and phenotypic correlation coefficients was also observed. Coefficients of phenotypic and environmental correlation were significant for many pairs of traits. Most of the significant environmental correlation coefficients were found for the same pairs of characteristics for which phenotypic correlation coefficients were significant. This shows that genetic and environmental factors affected similar traits. Fruit yield expressed the largest number of significant correlations with other traits. Path coefficient analysis indicated that plant and berry size were the main factors influencing directly fruit yield in both years. It was proved that the number and length of one-year-old shoots via bush size had very large indirect effects on fruit yield per plant.