Horticultural Science, 2005 (vol. 32), issue 4

Damage to peach and apricot trees in selected localities of Slovakia

H. Ivanová, G. Juhásová, Š. Čerčer

Hort. Sci. (Prague), 2005, 32(4):123-128 | DOI: 10.17221/3778-HORTSCI  

In this paper we have evaluated the health condition of Prunus persica (L.) Batsch and Prunus armenia-ca L. for the occurrence of the parasitic microscopic fungus Cytospora cincta Sacc. Apricot trees in 5 localities with 10 sites and peach trees in 5 localities with 8 sites were evaluated. We identified symptoms of the disease in host plants, conditions for isolation and cultivation of the fungus and the growth rate of the mycelium hyphae on various substrates. The damage degree was evaluated in 330 trees in four localities while most trees were characterised by degree 1-3. We have derived conclusions for protective measures...

Rootstock-scion interactions on dwarfing cherry rootstocks in Hungary

G. Bujdosó, K. Hrotkó

Hort. Sci. (Prague), 2005, 32(4):129-137 | DOI: 10.17221/3779-HORTSCI  

In 1997 the Research Institute for Fruitgrowing and Ornamentals set up a comparative rootstock trial to study foreign-bred dwarf cherry rootstocks in the Hungarian climate. Based upon their effects on trunk and canopy growth, rootstocks can be classified into 3 groups: very vigorous (Cerasus mahaleb L. Cema, Cerasus avium L. C. 2493, Weiroot 13), medium vigorous (Weiroot 158, Weiroot 154, P-HL-A) and dwarfing rootstocks (Weiroot 72, Weiroot 53, GiSelA 5). Differences between the blooming and ripening times of rootstock/scion combinations were also observed. Linda produced the highest cumulative yield followed by Katalin, Germersdorfi...

Polyploidy effects on frost tolerance and winter survival of garden pansy genotypes

A. D. Lagibo, F. Kobza, P. Suchánková

Hort. Sci. (Prague), 2005, 32(4):138-146 | DOI: 10.17221/3780-HORTSCI  

This study was conducted to interpret the differences in frost tolerance and winter survival between 8x, 10x, 12x, 14x, and 16x ploidy levels of garden pansy (Viola × wittrockiana Gams) genotypes grown in the field conditions. Plants of each genotype were analyzed for their ploidy levels using flow cytometry. The chlorophyll fluorescence parameters were measured with portable chlorophyll fluorometer in the greenhouse and in the field at different time intervals. Increased frost stress generally reduced the fluorescence values in all genotypes. However, the genotypes differed significantly in their...

Seed development stages of kale (Brassica oleracea var. acephala L.) genotypes in Turkey

E. Demir, A. Balkaya

Hort. Sci. (Prague), 2005, 32(4):147-153 | DOI: 10.17221/3781-HORTSCI  

This research determined the stages of kale (Brassica oleracea var. acephala L.) seed development in Samsun province, Turkey, between 2002 and 2003. Plants of inbred kale lines (55TE07, 55TK09, 52PE09, 61ÇY01 and 67DE01) were grown. On the basis of seed and embryo colour, seed morphology (seed length, seed width and embryo length), seed development can be divided into 7 discrete but contiguous stages. The germination rate of inbred lines was at its maximum, or near to its maximum, until the seed moisture declined to 50%. Germination rates reached a maximum level at 65 days after pollination (DAP). It was concluded that kale seeds...

Relationship between antiradical activity, polyphenolic antioxidants and free trans-resveratrol in grapes (Vitis vinifera L.)

M. Šulc, J. Lachman, A. Hejtmánková, M. Orsák

Hort. Sci. (Prague), 2005, 32(4):154-162 | DOI: 10.17221/3782-HORTSCI  

Contents of polyphenolic antioxidants as total polyphenols (TP), free trans-resveratrol (R) and their antiradical activity (ARA) in grape skins and seeds of grape varieties and TP in grape musts originating from 5 wine-growing Czech areas from the harvest 2003 were determined. TP content was determined spectrophotometrically with phenol Folin-Ciocalteau's reagent, R content by HPLC method, and ARA employing the 1,1-diphenyl-2-picrylhydrazyl stable free radical (DPPH.). Obtained results were evaluated statistically by Statistica programme. TP did not show any statistically significant differences between the analysed varieties (p <...