Template-Type: ReDIF-Article 1.0 Author-Name: D. Milatović Author-Workplace-Name: Faculty of Agriculture, University of Belgrade, Belgrade, Serbia Author-Name: D. Nikolić Author-Workplace-Name: Faculty of Agriculture, University of Belgrade, Belgrade, Serbia Author-Name: D. Đurović Author-Workplace-Name: Faculty of Agriculture, University of Belgrade, Belgrade, Serbia Title: Variability, heritability and correlations of some factors affecting productivity in peach Abstract: Factors affecting productivity in peach, such as flower density, initial and final fruit set by open pollination, and yield per m length of shoot were studied in 40 cultivars during a three-year period. Significant differences among cultivars were found for all studied properties. The coefficients of variability were the lowest for initial fruit set and then for final fruit set and flower density; while they were the highest for yield. The relatively high values of heritability were found for flower density and yield. Significant correlation coefficients were found between initial and final fruit set, flower density and yield, as well as between final fruit set and yield. In areas with a higher risk of freeze damage the cultivars characterized by higher flower density and fruit set should be grown because they can provide more consistent yield potential. At the same time, these cultivars require more intensive pruning and fruit thinning to achieve quality fruit. Keywords: Prunus persica, flower density, fruit set, yield Journal: Horticultural Science Pages: 79-87 Volume: 37 Issue: 3 Year: 2010 DOI: 10.17221/63/2009-HORTSCI File-URL: http://hortsci.agriculturejournals.cz/doi/10.17221/63/2009-HORTSCI.html File-Format: text/html X-File-Ref: http://agriculturejournals.cz/RePEc/caa/references/hor-201003-0001.txt Handle: RePEc:caa:jnlhor:v:37:y:2010:i:3:id:63-2009-HORTSCI Template-Type: ReDIF-Article 1.0 Author-Name: R. Hajiboland Author-Workplace-Name: Plant Science Department, University of Tabriz, Iran Author-Name: H. Amirazad Author-Workplace-Name: Plant Science Department, University of Tabriz, Iran Title: Drought tolerance in Zn-deficient red cabbage (Brassica oleracea L. var. capitata f. rubra) plants Abstract: Effects of Zn deficiency were studied in red cabbage plants under well-watered or drought conditions. Impairment of growth due to Zn deficiency was higher under drought compared with well-watered conditions. Drought stress caused a drastic decline in Zn content and led to a damage of photosynthetic apparatus in Zn-deficient but not Zn-sufficient leaves. Net assimilation and transpiration rate were strongly reduced under Zn deficiency and drought conditions following reduction of stomatal conductance. Activity of antioxidant enzymes, with the exception of superoxide dismutase, increased under Zn deficiency conditions, while drought enhanced activity of all studied enzymes concomitant with accumulation of malondialdehyde and H2O2. The intensifying effect of drought on Zn-deficient leaves could be explained by impaired leaf photochemical events, reduction of whole plant photosynthesis and imbalance between production and scavenging of reactive oxygen species. Water use efficiency, water and osmotic potential of drought-stressed plants were higher under low compared with adequate Zn supply, however, these parameters were not critical for plant growth response under combinative effect of drought and Zn deficiency. Keywords: Zn deficiency, drought stress, antioxidant defense system, red cabbage, chlorophyll fluorescence, CO2 assimilation Journal: Horticultural Science Pages: 88-98 Volume: 37 Issue: 3 Year: 2010 DOI: 10.17221/64/2009-HORTSCI File-URL: http://hortsci.agriculturejournals.cz/doi/10.17221/64/2009-HORTSCI.html File-Format: text/html X-File-Ref: http://agriculturejournals.cz/RePEc/caa/references/hor-201003-0002.txt Handle: RePEc:caa:jnlhor:v:37:y:2010:i:3:id:64-2009-HORTSCI Template-Type: ReDIF-Article 1.0 Author-Name: Y. Li Author-Workplace-Name: School of Agriculture and Biology, Shanghai Jiao Tong University, Shanghai, China Author-Name: T. Wang Author-Workplace-Name: School of Agriculture and Biology, Shanghai Jiao Tong University, Shanghai, China Author-Name: J. Li Author-Workplace-Name: School of Agriculture and Biology, Shanghai Jiao Tong University, Shanghai, China Author-Name: Y. Ao Author-Workplace-Name: School of Agriculture and Biology, Shanghai Jiao Tong University, Shanghai, China Title: Effect of phosphorus on celery growth and nutrient uptake under different calcium and magnesium levels in substrate culture Abstract: A greenhouse pot experiment was performed to study the effect of phosphorus (P) on celery (Apium graveolens L.) growth, quality and nutrient uptake under different calcium (Ca) and magnesium (Mg) levels in substrate culture. Results showed that there were significant interactions between P and the level of Ca and Mg in the growing media. Celery above-ground fresh weight, total dry biomass, leaf area, and P, Ca and Mg concentrations in celery leaves significantly increased from 0 to 124 mg/l P application. The opposite trends were observed for root/shoot ratio, leaf chlorophyll, carotenoids, soluble protein, soluble sugar, vitamin C, and nitrogen and potassium concentration in celery leaves. Medium Ca and Mg level (Ca 320 and Mg 192 mg/l) significantly increased celery above-ground fresh weight, total dry biomass and leaf area compared to low (Ca 160 and Mg 96 mg/l) and high (Ca 640 and Mg 384 mg/l) levels. This study suggested that 124-248 mg/l P applications under medium Ca and Mg level were appropriate for celery nutritional requirements. Keywords: Apium graveolens L., quality, growing media, nutrient solution, optimization, fertilization Journal: Horticultural Science Pages: 99-108 Volume: 37 Issue: 3 Year: 2010 DOI: 10.17221/81/2009-HORTSCI File-URL: http://hortsci.agriculturejournals.cz/doi/10.17221/81/2009-HORTSCI.html File-Format: text/html X-File-Ref: http://agriculturejournals.cz/RePEc/caa/references/hor-201003-0003.txt Handle: RePEc:caa:jnlhor:v:37:y:2010:i:3:id:81-2009-HORTSCI Template-Type: ReDIF-Article 1.0 Author-Name: B. Gregorová Author-Workplace-Name: Silva Tarouca Research Institute for Landscape and Ornamental Gardening (RILOG), Průhonice, Czech Republic Author-Name: K. Černý Author-Workplace-Name: Silva Tarouca Research Institute for Landscape and Ornamental Gardening (RILOG), Průhonice, Czech Republic Author-Name: V. Holub Author-Workplace-Name: Silva Tarouca Research Institute for Landscape and Ornamental Gardening (RILOG), Průhonice, Czech Republic Author-Name: V. Strnadová Author-Workplace-Name: Silva Tarouca Research Institute for Landscape and Ornamental Gardening (RILOG), Průhonice, Czech Republic Title: Effects of climatic factors and air pollution on damage of London plane (Platanus hispanica Mill.) Abstract: London plane (Platanus hispanica Mill.) is considered as very tolerant to pollution and other stresses and in the Czech Republic it has been unaffected by important pathogens until now. However, in recent years the health status of London plane has been significantly deteriorating. During an 11-year survey it was found out that development of London plane damage was characterized by important fluctuations. Minimum value of population damage was 3.6% and maximum 97.5%. The health status of London plane was negatively influenced by long-term precipitation totals, higher total precipitation in May, low average air temperatures in January and May and higher NOx concentrations in the vegetation season. Using the multiple regression analysis a highly significant regression model was obtained, wherein the average air temperatures in January and May explain together 84% variability of London plane population damage. During the period of the highest damage, planes were moreover affected by the pathogen Apiognomonia veneta (Sacc. et Spegg.) Höhn. Keywords: Platanus hispanica, health status, air pollutants, air temperature, precipitation, anthracnose Journal: Horticultural Science Pages: 109-117 Volume: 37 Issue: 3 Year: 2010 DOI: 10.17221/47/2009-HORTSCI File-URL: http://hortsci.agriculturejournals.cz/doi/10.17221/47/2009-HORTSCI.html File-Format: text/html X-File-Ref: http://agriculturejournals.cz/RePEc/caa/references/hor-201003-0004.txt Handle: RePEc:caa:jnlhor:v:37:y:2010:i:3:id:47-2009-HORTSCI Template-Type: ReDIF-Article 1.0 Author-Name: J. Suchá Author-Workplace-Name: Research and Breeding Institute of Pomology Holovousy, Ltd., Hořice, Czech Republic Author-Name: L. Svobodová Author-Workplace-Name: Research and Breeding Institute of Pomology Holovousy, Ltd., Hořice, Czech Republic Title: Incidence of Prune dwarf virus and Prunus necrotic ring spot virus in orchards of sweet and sour cherry in the Czech Republic: Short communication Abstract: During 2006-2008 field surveys were carried out in the important cherry growing areas of the Czech Republic to assess the incidence of Prune dwarf virus and Prunus necrotic ring spot virus in commercial orchards and nurseries. A total of 1,438 samples from 1,198 sweet cherry trees and from 240 sour cherry trees were tested by ELISA for the presence of Prune dwarf virus and Prunus necrotic ring spot virus. The overall average infection level was 17.7%. The most infected species were sour cherry trees (22.5%). The most frequently detected virus was Prune dwarf virus (10.9%). Prunus necrotic ring spot virus occurred in 6.3% of samples. Our study provided an indication of a sanitary status of sweet and sour cherry in commercial orchards and nurseries in the Czech Republic. Keywords: sweet cherry, sour cherry, Prune dwarf virus, Prunus necrotic ring spot virus, incidence, ELISA Journal: Horticultural Science Pages: 118-120 Volume: 37 Issue: 3 Year: 2010 DOI: 10.17221/74/2009-HORTSCI File-URL: http://hortsci.agriculturejournals.cz/doi/10.17221/74/2009-HORTSCI.html File-Format: text/html X-File-Ref: http://agriculturejournals.cz/RePEc/caa/references/hor-201003-0005.txt Handle: RePEc:caa:jnlhor:v:37:y:2010:i:3:id:74-2009-HORTSCI