Browsing by Author "Isajev V."

Now showing 1 - 3 of 3

Growth Characteristics of Tilia tomentosa Moench. From different districts in the regions of Marmara and Western Black Sea in Turkey
(2019-01-01) Yücedağ C.; Özel H.; Ayan S.; Ducci F.; Isajev V.; Šeho M.
Climate change will affect all ecosystem services of green areas in the districts. In many cases, the tree species in parks and districts are suffering from the increasingly warmer and drier summers and newly immigrated pests and diseases. Tilia tomentosa Moench. is considered as an important tree species under climate change for dry and warm conditions in Central and Southeastern Europe countries. This tree species is often used as valued urban tree. In the present study we investigate the growth patterns of T. tomentosa Moench. in relation to their growing conditions in order to evaluate its interactions in urban contexts. All the studied characters varied significantly among the sampled districts. Within each of the regions, number of flowers showed a wide range 72-104 per m2 in Marmara region and 54-124 per m2 in Western Black Sea region. All studied characters, beyond number of flowers, positively correlated with each other. This study revealed that especially fruit length had a strong and positive correlation with altitude and a high negative correlation with temperature. Further researches are required to quantify more growth flower characters of the species from Turkey.
Inter population variability of frost-resistance in provenances of scot pines (Pinusylvestris L.R. hamata Steven) in Turkey
(2016-01-01) Özel H.B.; Ayan S.; Isajev V.
Frost-resistance variability of Scotch pine (Pinus sylvestris L. var. hamata Steven) seedlings grown in nurseries conditions, originated from 10 provenances, have been analyzed. The provenances from Black Sea region, Central Anatolian region and Eastern Anatolian region in Turkey have been used in selection of seed zones. The results of frost-resistance tests indicated a strong relationship of implemented freezing degrees with injury degrees of Scotch pine needles and photosynthetic productivities. On the other hand, another significant relationship has been determined between chlorophyll fluorescence and ion leakage methods (r=-0.801). This result shows that those two methods can be safely used in determining the damages due to low temperatures. In frost resistance tests, Scotch pine seedlings from different provenances have been frozen at -10, -20, -30 and -40 °C. According to the Duncan test results, it has been determined that damage increased as temperature decreased. The damage level at -10°C implementation is 3.5% which can be tolerated by plants. But when the temperature has been decreased to -20°C, the level of damage has increased to 51.25%. As a result of photosynthetic analyses in this phase, it has been determined that there is a statistically significant relationship between provenances and temperature levels. Under the light of those findings, they have determined that the photosynthetic productivity has significantly decreased at temperatures between -20°C and -40°C. This situation conforms to injury index values determined in this study. As a result of injury index and photosynthetic productivity tests used for determining the damage after frost-resistance tests, it has been determined that the provenances of Amasya-Kunduz, Bolu-Aladag, Düzce-Yigilca, Samsun-Vezirköprü and Eskisehir-çatacik are more sensitive to frost than other provenances.
Preliminary results of Turkish hazelnut (Corylus colurna L.) populations for testing the nut characteristics
(2018-01-01) Ayan S.; Ünalan E.; Sakici O.; Yer E.; Ducci F.; Isajev V.; Ozel H.
Ovaj rad ima za cilj da identifikuje karakteristike lešnika četiri različite populacije (Agli-Tunuslar, Agli-Musellimler, Arac-Guzluk i Tosia-Kucuksekiler) u severozapadnom regionu crnomorske regije Turske, jednoj od najvažnijih oblasti od ekonomskog interesa za ovu vrstu. Tamo, Turski lešnik (Corylus colurna L.) raste u optimalnim uslovima i otkriva relativno visoku medu-populacionu i intra-populacionu varijaciju u pogledu karakteristika ploda. U cilju procene varijacije, izvršene su merenja u četiri populacije u okrugu Kastamonu za 14 razlicitih karakteristika ploda (broj matica po klasteru, dužina lešnika (mm), širina lešnika (mm), debljina lešnika (mm), debljina školjke (mm), velicina lešnika (mm), oblik lešnika, indeks kompresije, težina matice (g), dužina jezgra (mm), širina jezgra (mm), debljina jezgra (mm), težina jezgra (g) i odnos jezgra (%) na reprezentativnim uzorcima populacije. Značajne razlike su utvrdene medu populacijama u odnosu na sve karakteristike lešnika (p < 0,05). Prema klaster analizi cetiri populacije su stvorile dve grupe, populaciju Agli-Tunuslar i ostale. Najbliže populacije bile su Tosia-Kucuksekiler i Arac-Guzluk u pogledu karakteristika lešnika. Prema rezultatima dobijenim bilo na osnovu populacije ili bez diskriminacijepopulacije, utvrdene su znacajne korelacije izmedu većine osobina lešnika. Populacija Arac-Guzluk je imala najveće lešnike medu onima koji su ispitivani i to je populacija koja je imala najviše vrednosti u pogledu karakteristika velicine oraha dok je provincija Tosia-Kucuksekiler pokazala najviše vrednosti, sa prosecnim vrijednostima od 5, 15,92 mm, 1,32 i 11,75 mm respektivno za lešnike po klasteru, širinu lešnika, indeks kompresije i širinu jezgra. Populacija Agli-Tunuslar je pokazala najviši odnos jezgra sa 38,2%.