Horticultural Science, 2005 (vol. 32), issue 1
Use of rooted leaves for screening of Brassica germplasm response to clubroot (Plasmodiophora brassicae) and downy mildew (Hyaloperonospora parasitica)
P. Havránek, B. Navrátilová, V. Chytilová
Hort. Sci. (Prague), 2005, 32(1):1-5 | DOI: 10.17221/3758-HORTSCI 
Rooted leaves and cotyledons of various cruciferous crops were used for the screening of Brassica germplasm response to two obligatory pathogens: clubroot (Plasmodiophora brassicae) and downy mildew (Hyalope-ronospora parasitica). The development of roots was induced after 20-hour dipping of leaf pedicels in the mixture of growth regulators: indolyl-butyric acid (10 mg/l) and nicotinic acid (5 mg/l). The detached rooted leaves and cotyledons were maintained in 250ml plastic containers with perlite under fluorescent tubes in a growth chamber. With additional foliar fertilizing they remain vital for four months, producing clubroot...
The effect of carbon source on plant regeneration in tomato
J. Gubiš, Z. Lajchová, L. Klčová
Hort. Sci. (Prague), 2005, 32(1):6-8 | DOI: 10.17221/3759-HORTSCI
The effect of different tomato cultivars and different sugar types (sucrose, glucose and maltose) and concentrations (1.0, 2.0 and 3.0%) on shoot regeneration from aseptically grown hypocotyl and cotyledon explants were studied. Among sugar types, sucrose at a concentration of 3.0% induced the highest number of shoots from both types of explants. In hypocotyl explants, cv. Premium showed the best regeneration capacity (0.23 shoots per explant), and in cotyledon explants, cv. Hana produced the maximal number of shoots (0.43 or 0.37 for media with 2.0% or 3.0% sucrose, respectively).
Effects of applications of a complex and N-Ca fertilizer on leaf and fruit nutrient concentrations and some fruit quality parameters in two apple cultivars
T. E. Sotiropoulos, I. N. Therios, K. N. Dimassi, V. Tsirakoglou
Hort. Sci. (Prague), 2005, 32(1):9-16 | DOI: 10.17221/3760-HORTSCI
The aim of this research was to study the effects of application of 'hydrocomplex' (H) and 'Norway nitrate' (NN) fertilizers on leaf and fruit nutrient concentrations and some fruit quality parameters in the following apple (Malus domestica Borkh) cultivars (cvs.): Golden Delicious and Black Ben Davis. Applications of 50 kg NN, 75 kg NN, 50 kg NN plus 50 kg H and 75 kg NN plus 25 kg H per 0.1 hectare significantly increased leaf Ca concentration of the cv. Golden Delicious in comparison with the control in the July 15 sampling period. Boron concentration of leaves of the cv. Black Ben Davis increased steadily throughout the season. Applications...
Variability of the content of active substances during Achillea collina Rchb. Alba ontogenesis
K. Karlová, K. Petříková
Hort. Sci. (Prague), 2005, 32(1):17-22 | DOI: 10.17221/3761-HORTSCI
The fluctuation of essential oil, flavonoid and tannin content in Achillea collina Rchb. Alba (flos and herba millefolii) during ontogenesis was studied in this paper. Ten developmental stages of plants - from the beginning of flower differentiation to ripe seed stage - were tested for 3 years. The essential oil content was found to range between 0.4 and 1.6% of dry material and it was statistically significantly (one-factor analysis of variance; α = 0.05) influenced by developmental stage, harvested part of the plant and also by seasonal climatic conditions. The flavonoid content was influenced only by developmental...
Chipping quality of potatoes stored in heaps and pits in subtropical plains of India
D. Kumar, V. Paul, R. Ezekiel
Hort. Sci. (Prague), 2005, 32(1):23-30 | DOI: 10.17221/3762-HORTSCI
Two potato cultivars Kufri Bahar and Kufri Jyoti were stored in heaps and pits under ambient conditions of sub-tropical plains of northern India and their chipping quality was determined after 90 days of storage. During storage there was a significant reduction (33.84%) in the reducing sugar content of potatoes and improvement (31.63%) in chip colour. Sugar levels in stored potatoes were within the acceptable limit for processing and table purposes indicating that potatoes stored up to 90 days on the farm in heap and pits are suitable for these two purposes.
Role of bioinoculants and auxin in development of salt tolerant Mentha arvensis
S. Kashyap, S. Sharma
Hort. Sci. (Prague), 2005, 32(1):31-41 | DOI: 10.17221/3763-HORTSCI
Pot experiments were conducted for the development of salt tolerant Mentha arvensis (Japanese mint, family: Labiatae) saplings involving bioinoculants, namely Arbuscular Mycorrhizal (AM) fungi, Azotobacter and an auxin - Indole Acetic Acid (IAA). The IAA and sodium chloride (NaCl) concentrations were standardized prior to the experiments. The 10-ppm IAA and 0.08% NaCl (w/v) were found to be optimum in combination with AM fungi and Azotobacter to increase all the growth parameters and microbial count in the rhizosphere. For development of salt tolerant saplings, the optimal concentration of IAA, along with AM fungi and Azotobacter...