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Articles by Viorel FLORIAN
Total Records ( 3 ) for Viorel FLORIAN
  Vlad Horea STOIAN and Viorel FLORIAN
  In natural plant communities are formed fungal-plant associations, associations with the increasing role of the feeding process of both artners, the fungus becoming an extension of the plant’s root system, in exchange of carbohydrates synthesized by plants. Mycorrhizal associations are defined by three elements - plant root system, an intraradicular hyphal system and an extraradicular hyphal system. The study of mycorrhizal symbiosis in controlled environments provided by a green house allows the inplementation of a sampling system in different phase of growth and development of symbiotic fungi. Analisys on samples taken were used to explain the frequency and abundance of different structure in emerging or developed the extraroot by vesicular-arbusculare mushrooms Analizele efectuate asupra probelor recoltate au fost utilizate pentru explicarea frecventei si abundentei cu care apar diferitele structuri intra- sau extraradiculare dezvolatate de catre ciupercile vezicular-arbusculare.
  Elena NAGY , Laura TIGUDEAN , Alexandra SUCIU , Viorel FLORIAN and Dan Cristian NAGY
  Spring barley crops are damaged by numerous diseases but only a few caused quantitative and qualitative yield losses in every year, in Transylvania conditions. The complex of foliar diseases: powdery mildew (Blumeria graminis f. sp. hordei), scald (Rhynchosporium secalis), net blotch (Pyrenophora teres) and leaf blotch (Septoria passerini), leaf rust (Puccinia hordei) as well as head blight (Fusarium spp.) and barley yellow dwarf virus (BYDV) are the most frequently in spring barley crops. Yield losses reaching to 25% from yield value depend on climatic conditions and spring barley cultivar. The effect of fungicide foliar treatments on the four spring barley cultivars was studied at ARDS Turda during three years. It was organized bifactorial trials after block split type with 4 cultivars and 3 treatments variants: untreated (T0), 1 Treatment (T1) applied leaf flag emergence and 2 treatments (T2) applied leaf flag emergence and in the end of flowering. The fungicides used contain: spyroxamine 250g/l + tebuconazole 167g/l + triadimenole 43g/l at dose 0,6l/ha for the first treatment and for the second treatment contain: trifloxystrobin 100g/l+ tebuconazole 200g/l at dose 0,8g/l. In the field, attack degree for main diseases (%) and yield (kg/ha) were determined. In the laboratory, thousands kernels weight (TKW), volumetric weight (VW) and percentage of Fusarium diseased kernels were registered. The weather conditions from April, May, June months of 3 years is characterized by exceeded temperature in April and May months, associated with strong hydric deficit in April and very rainfall in May month, were not very favorable of the diseases occurrence, it know that is essentially weather- dependent. Foliar diseases: powdery mildew, net blotch, and leaf rust were presented in spring barley crops. By applying of one single fungicide treatment, attacked leaf area by foliar diseases was significantly reduced, in average, with 50% and quite more at Daciana and Jubileu cultivars. Applying of 2 treatments diminished substantially diseased leaf area (3,1 %) and percentage of Fusarium diseased kernels (2,0%). Applying one foliar treatment increases yield with 7,9 % and for two treatments with 18,2%, in average, in the three years, compared with untreated plots. Fungicidal foliar treatments have influenced positively TKW and VW, determining increases rich up to 17,5%, respectively up to 5,8%, statistic assured values. Tested fungicides such as theses contain: propiconazole 250g/l+ciproconazole 160g/l (0,5l/ha), azoxystrobin 200g/l + ciproconazole 80g/l (0,5l/ha) and prothioconazole 125g/l + tebuconazole125g/l (0,8 l/ha) and the others, presented a good efficacy in controlling spring barley foliar and ear diseases.
  Vlad Horea STOIAN and Viorel FLORIAN
  Mycorrhizal fungi are simbionts with root system of most evolved plants. These associations may vary in structure and function, but the most common interactions are arbuscular type (AM). It is estimated that the percentage of terrestrial plants forming this type of associations exceeds 80% - and this includes many cultivated species. Parameter values described in this paper were derived by setting up an experiment in controlled environment provided by a green house. A terra rosa soil type, from a pasture in the Apuseni Mountains, were installed seeds of Festuca rubra. The four variants (with 3 repetitions) of the experiment are different growth and development stages of Festuca rubra plants. Variant V1 represent the situation of colonization at 8 weeks from plant emergence, V2, V3 and V4 variants - the colonization at 10, 12 and 14 weeks after emergence. Processing of samples for microscopic analysis were made using the method of staining with an ink and vinegar solution (Vierheilig et al, 1998) improved on certain points, and the results were interpreted using Mycocalc software. By analyzing the frequency (F%) of mycorrhiza in the root system in Festuca rubra plants, only the mean colonization for V1 variant is 91%, results to other variants are higher than 95%. Intensity of the mycorrhizal colonisation in the root system (M%) found on analyzed plants show an upward trend, starting at a level of 27% to variant V1 and reaching a maximum point at the variant V4, respectively a value of 44%. Arbuscules abundance in the root system achieve maximum value for variant V4 (19%), from a value of 6% at variant V1; the minimum being recorded at the variant V2 (harvested 10 weeks after plant emergence).
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