Horticultural Science, 2019 (vol. 46), issue 2
Influence of chemotherapy on development and production of virus free in vitro strawberry plantsOriginal Paper
Jiří Sedlák, Frantiąek Paprątein, Jana Suchá
Hort. Sci. (Prague), 2019, 46(2):53-56 | DOI: 10.17221/249/2017-HORTSCI 
The objective of the study was to determine effects of ribavirin on development and health status of in vitro grown strawberry cultivars 'Honeoye' and 'Elkat' infected with viruses Strawberry mild yellow-edge virus (SMYEV), Tomato ringspot virus (ToRSV) and Arabis mosaic virus (ArMV). Antiviral compound ribavirin was added in concentrations 20, 40, 80 and 160 mg/l to the same MS medium as for multiplication. Growth reduction was noted on medium with 160 mg/l ribavirin and to a lesser degree in the 40 and 80 mg/l treatments. At the end of chemotherapy, in vitro clones free of viruses detected previously in the initial plants were obtained for both selected...
The effect of cover crops on the yield of carrot (Daucus carota L.) in ploughless and conventional tillageOriginal Paper
Marzena Błażewicz-WoĽniak, Dariusz Wach, Elżbieta Patkowska, Mirosław Konopiński
Hort. Sci. (Prague), 2019, 46(2):57-64 | DOI: 10.17221/61/2017-HORTSCI
The experimental design included seven cover crop species and six kinds of soil tillage in the field cultivation of carrot. The use of cover crops had a positive impact on the yield of marketable roots of carrot in comparison with the cultivation without the cover crops. A significant increase of marketable yield was noted after phacelia, buckwheat, mustard and sunflower. The flat ploughless tillage significantly reduced the marketable yield of roots in comparison with traditional ploughing. The largest marketable yield of roots was obtained from cultivation on ridges after mixing the biomass of buckwheat or phacelia or mustard with the soil, and the...
Liming, phosphorus and zinc influence on soil nematode community structure at hot pepperOriginal Paper
Ivana Varga, Teuta Benković-Lačić, Zdenko Lončarić, Brigita Popović, Mirjana Brmeľ
Hort. Sci. (Prague), 2019, 46(2):65-71 | DOI: 10.17221/217/2017-HORTSCI
Monitoring the biological quality of soils often include nematodes as bioindicators. The aim of this study was determined the influence of liming, P and Zn effect on nematode community structure as an indicator of soil ecosystem health in hot pepper. Pot experiment with hot pepper was conducted in randomized block design as follows: control, P, Zn, P + Zn, lime, P + lime, Zn + lime and P + Zn + lime (25 mg/kg P, 1 mg/kg Zn and lime as 2.22 g/kg CaCO3). The highest number of nematodes genera was with phosphorus application (17.25). The most common genera were Rhabditis and Tylenchus. Above all indices, only the Structure index (SI) shown significance...
Effect of planting time and supplemental irradiation on growth and flowering of Lachenalia 'Romaud'Original Paper
Anna Kapczyńska
Hort. Sci. (Prague), 2019, 46(2):72-80 | DOI: 10.17221/203/2017-HORTSCI
Growth and flowering of lachenalia 'Romaud' was studied with reference to its commercial potential as pot plant and the need to obtain flowering plants at a specific time. The experiment was carried out in a heated glasshouse. Lachenalia bulbs were planted in November, December, January and February. The plants were exposed to two lighting regimes, natural lighting and natural lighting with supplemental irradiation (HPS lamps). The later the planting date was, the faster the bulbs flowered, and they produced thicker inflorescence stems with greater number of florets. Depending on the bulb planting date and light conditions, the plants flowered from...
Stomatal anatomy and closing ability is affected by supplementary light intensity in rose (Rosa hybrida L.)Original Paper
Dimitrios Fanourakis, Benita Hyldgaard, Habtamu Giday, Isaac Aulik, Dimitris Bouranis, Oliver Körner, Carl-Otto Ottosen
Hort. Sci. (Prague), 2019, 46(2):81-89 | DOI: 10.17221/144/2017-HORTSCI
Increasing the light level in protected cultivation of ornamental crops via supplementary lighting is critical to enhance both production and external quality especially during the periods of low light availability. Despite wide applications the effects of light intensities were not previously addressed on water loss pathways. In this study rose plants were cultivated at 100, 200 or 400 μmol/(m2.s) photosynthetic photon flux density (PPFD). The stomatal responsiveness to desiccation, stomatal anatomical features and cuticular transpiration were determined. Plant biomass as well as photosynthesis response to light and CO2 were also assessed. Increasing...
Cryopreservation of Caninae rose shoot tips guarantees biochemical stability and pollination potential monitored in four-year-old regenerantsOriginal Paper
Bożena Pawłowska, Jarmila Neugebauerová, Monika Bieniasz, Bożena Szewczyk-Taranek, Ivo Ondrasek
Hort. Sci. (Prague), 2019, 46(2):90-97 | DOI: 10.17221/239/2017-HORTSCI
Stability of Rosa agrestis, R. canina, R. dumalis and R. rubiginosa regenerants after shoot tip cryopreservation was monitored with the use of biochemical markers and pollen quality assessment in matured plants cultivated in the field. The results of rosa pollen and hip evaluation revealed no significant differences between post-cryopreserved regenerants and control plants; however, variations in the assessed markers were noted between Rosa species. Analyses of hips confirmed high levels of vitamin C in these plants; the highest was observed in R. dumalis (750-870 mg/100 g fresh weight). High total antioxidant activity (TAC) was as follows: DPPH -...
Testing the potential of LEDs to enhance growth and quality characteristics of Salvia fruticosaOriginal Paper
Filippos Bantis, Kalliopi Radoglou
Hort. Sci. (Prague), 2019, 46(2):98-106 | DOI: 10.17221/206/2017-HORTSCI
The effect of light-emitting diodes (LED) with broad radiation spectra on developmental, physiological, and phytochemical characteristics of Greek sage (Salvia fruticosa L.) seedlings was assessed. Fluorescent (FL - control) tubes and four LED lights [AP67 (moderate blue, red and far-red), L20AP67 (moderate blue, red and far-red, high green), AP673L (moderate blue, high red) and NS1 (high blue and green, low red, high red : far-red, 1% ultraviolet)] were used in a growth chamber. Seedlings grown under FL, L20AP67 and AP673L exhibited the best morphological and developmental characteristics. FL led to inferior root biomass formation compared to all...
Modelling evapotranspiration of soilless cut roses 'Red Naomi' based on climatic and crop predictorsOriginal Paper
Patricia Malva Costa, Isabel Pôças, Mário Cunha
Hort. Sci. (Prague), 2019, 46(2):107-114 | DOI: 10.17221/147/2017-HORTSCI
This study aimed to estimate the daily crop evapotranspiration (ETc) of soilless cut 'Red Naomi' roses, cultivated in a commercial glass greenhouse, using climatic and crop predictors. A multiple stepwise regression technique was applied for estimating ETc using the daily relative humidity, stem leaf area and number of leaves of the bended stems. The model explained 90% of the daily ETc variability (R2 = 0.90, n = 33, P < 0.0001) measured by weighing lysimeters. The mean relative difference between the observed and the estimated daily ETc was 9.1%. The methodology revealed a high accuracy and precision in the estimation of daily ETc.