Horticultural Science, 2005 (vol. 32), issue 3
Sporadic distribution of Plum pox virus M strain in natural sources in the Czech Republic
J. Polák, J. Pívalová
Hort. Sci. (Prague), 2005, 32(3):85-88 | DOI: 10.17221/3770-HORTSCI 
The presence and distribution of M strain of Plum pox virus (PPV-M) were investigated in natural hosts of Sharka, plums, myrobalans and blackthorns in the Czech Republic. Leaves or flowers of trees were evaluated for the presence of PPV by specific polyclonal antibodies at first. PPV infected samples were investigated for the presence of PPV-M by strain specific monoclonal antibodies. 102 PPV isolates from plum, 81 from myrobalan and 25 from blackthorn were typed. PPV-M was detected in six plum trees, six myrobalan trees and in one shrub of blackthorn. Sporadic incidence of PPV-M was proved in all investigated areas of the Czech Republic....
Influence of environmental conditions on the quality of potato tubers
K. Hamouz, J. Čepl, P. Dvořák
Hort. Sci. (Prague), 2005, 32(3):89-95 | DOI: 10.17221/3771-HORTSCI
In 1995-1997 seven varieties of potatoes were cultivated in field trials in twelve localities in the Czech Republic. Six of the twelve localities were situated in lower, warmer and drier areas with fertile, predominantly loamy soils. The other localities were situated in higher, colder and more humid areas. They represent traditional potato-growing areas in the Czech Republic. After harvest potato tubers of all varieties were analysed for resistance to mechanical damage, dry matter content, reducing sugar (RS) content, nitrate content, polyphenol content. Glycoalkaloid (GA) content was analysed only in Karin variety. In all experimental years potatoes...
Yield, cluster drop and nut traits of three Turkish hazelnut cultivars
Ü. Serdar, T. Demir
Hort. Sci. (Prague), 2005, 32(3):96-99 | DOI: 10.17221/3772-HORTSCI
The yield, cluster drop and nut traits of the hazelnut cultivars Tombul, Palaz and Çakildak in Turkey were examined during 2001-2002. The cluster drop ranged from 7.5 to 17.0%. The highest yield per shrub with 2,930 g in 2001 and 3,190 g in 2002 was found in cultivar Tombul. This cultivar was also better in terms of the studied fruit traits compared with the other cultivars. In this cultivar (in 2001 and 2002), nut numbers per cluster were 3.87 and 3.46, nut weights were 1.53 and 1.70 g, kernel weights 0.93 and 0.99 g, and kernel proportions were 50.9 and 53.8%.
Determination of yield and yield components in wild thyme (Thymbra spicata L. var. spicata) as influenced by development stages
Ö. Tonçer, S. Kizil
Hort. Sci. (Prague), 2005, 32(3):100-103 | DOI: 10.17221/3773-HORTSCI
Thymbra spicata var. spicata, which grows wildly in the flora of Turkey, is known as thyme. A field trial was conducted to determine suitable harvesting time and cutting height for Thymbra, therefore plants in the trial were harvested at two cutting heights in various stages of development in the course of the growing season (pre-flowering, full-flowering and post-flowering). It was determined that the time of harvesting had a significant effect on herbage yields, oil percentage and oil yield. The highest drug leaf yield (3.107 t/ha) was obtained in the full-flowering stage with 10 cm cutting length, essential oil percentage...
Identification of sucrase activity in cell suspension and culture medium of melon
J. Stano, K. Mičieta, A. Barth, M. Valšíková, M. Fulmeková, P. Matejka, M. Varadínová
Hort. Sci. (Prague), 2005, 32(3):104-107 | DOI: 10.17221/3774-HORTSCI
The activity of (soluble acid) sucrase was detected in a culture medium of the cell suspension culture of watermelon (Citrullus vulgaris L.). A simple and rapid procedure for the identification and determination of extracellular sucrase from a culture medium of watermelon cell suspension cultures is described. Sucrose was used as a substrate for the determination of extracellular and intracellular activities of the enzyme. Intracellular activity was estimated from the cell suspension. The results show a 91.5-92.0% intracellular and 8.0-8.5% extracellular distribution of sucrase activity. The described method enables to carry out a rapid, simple...
Energetic aspects of the productive potential of grapevine in Malé Karpaty vineyard region
F. Špánik, B. Šiška, Š. Hronský
Hort. Sci. (Prague), 2005, 32(3):108-111 | DOI: 10.17221/3775-HORTSCI
The grapevine productive potential estimated according to PAR input and efficiency of its conversion into phytomass yield are analysed in the paper. The analysis was based on results of experiments realised in the framework of research projects VTP 27-19 and GP 1/8172/01 in 1999-2001 in Malé Karpaty vineyard region, Hlohovec district. It was concluded that the actual phytomass production and also grape production were on average on the level of 53% of potential yields given by the radiation input. The productive potential according to PAR input can be 1.9 times higher in Malé Karpaty vineyard region.
Adaptation of twenty peach and nectarine varieties in Kos and their susceptibility to Plum pox virus and Phytophthora citrophthora: Short communication
X. Papanikolaou, C. Tsipouridis, T. Thomidis, D.C. Stylianidis
Hort. Sci. (Prague), 2005, 32(3):112-117 | DOI: 10.17221/3776-HORTSCI
Twenty peach and nectarine (Prunus persica [L.] Batsch) varieties (Morettini No. 1, Coronet, Dixired, Jerseyland, Gialla Precoce Morettini, Cardinal, Golden Jubilee, Red Haven, Belle di Georgia, Early Elberta, Elberta, J.H. Hale, Rio Oso Gem, Desert Gold, Spring Time, June Gold, Red Cup, Flavor Top, Fantasia, Flame Kist) grafted on wild peach seedlings were evaluated for 10 years in the Greek island Kos. The results showed that some peach and nectarine varieties with high chilling requirements such as Red Haven (950 hrs) gave satisfactory yield in the soil and climatic conditions of Kos, where the mean duration of temperatures below 7°C was...
Influence of growth regulators on plant regeneration in tomato
J. Gubiš, Z. Lajchová, L. Klčová, Z. Jureková
Hort. Sci. (Prague), 2005, 32(3):118-122 | DOI: 10.17221/3777-HORTSCI
We studied the effect of different plant growth regulators on in vitro regeneration and plant growth of three cultivars of tomato (Lycopersicon esculentum Mill.) from explants derived from hypocotyls and cotyledons of aseptically grown seedlings. The regeneration capacity was significantly influenced by cultivar and explant type. The highest number of shoots regenerated in both types of explants was recorded on MS medium supplemented with 1.0 mg/dm3 zeatin and 0.1 mg/dm3 IAA. The cultivar UC 82 showed the best regeneration capacity on all types of used media. The most responsive explants were hypocotyls with...