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Northeastern part of Anatolia is a gene center of grapevine and a wide diversity of Fox grapes grow here. Viticulture and some grapevines in the Black Sea Region (in the north of Turkey) are on the verge of extinction; several types and varieties grown in this region have never been described and did not survive till present. For the past 10 years vineyards and grapevines in the Black Sea Region have been studied. In the present study, eighteen grapevines of foxy taste grown in the Artvin and Rize provinces were described. An ampelographic description of young shoot, mature shoot, young leaf, mature leaf, berry, bunch and seed were carried out using the OIV (Office International de la Vigne et du Vin) list for grapevine cultivars and Vitis species. However, several other parameters of the cultivars were measured for evaluation. 163American or French-American hybrids of Fox grapes like Beta, Cynthiana, Mars, Venus, Concord, Delaware, Catawba and Niagara are grown on limited acreages in North America; they were derived from North America native Vitis labrusca and an unknown Vinifera, and were probably created by random pollination as a result of the 18 th century attempts to establish European vines in the U.S. Labrusca grapes are also found in colder regions of Eastern Europe. These species have relatively low sugar, low acid, low pH, soft pulp with thick skin, and few moderate-size berries per bunch; they suit best for fresh use and for jam, juice, wine, pekmez and jelly production. Fruit flavors are described as foxy or like passion fruit. Fox grapes (Vitis labrusca L.) are generally more resistant to fungal diseases than Vinifera species. They can be used as a rootstock in the areas where phylloxera disease is prevalent and can also be used in breeding programs with Vitis vinifera in order to impart its resistance (Winkler et al. 1974;Weaver 1976;Antcliff 1997;Çelik 2004). Furthermore, Hardie and Cirami (1997) reported that Labrusca grapes seem to tolerate acidic soil conditions such as those in Northeastern Turkey.Ampelography is a scientific branch focused on differentiation and identification of grapevine varieties and hybrids. As varietal confusions continuously occur, the importance of developing an identification procedure increases (Morton 1979;Fidan 1985). Ampelographic studies have been made since the 17 th century; the characteristics of many grapes were determined by different researchers in various countries (Kara 1990;Schneider, Manini 1994;Martinez, Perez 1999;Braykov et al. 2002;Zahedi et al. 2002;Russo et al. 2004). Determination of grape characters used to be based on "Descriptor for Grapevine (Vitis spp.)" prepared by the International Board of Plant Genetic Resources (IBPGR) in 1983; however, the latest list was developed in cooperation with Office International de la Vigne et du Vin (OIV) and the International Union for the Protection of New Varieties of Plants (UPOV) in 1997 (Anonymous 1997). The ampelographic studies in Turkey were first made by Oraman (1972); since then, the...

Nutrition of grapevines is very sensitive issue in vineyards. Soil quality is very important matter for growth and quality in vine growing. Rootstocks affect the growth and productivity of grapevine as well as increase or decrease of the nutrient uptake. The present study was conducted to determine the phenological changes of nutrient uptakes in 10 years 'Trakya İlkeren' grape variety (Vitis vinifera L.) in the heavy clay soil conditions. The grapevines are grown on 5BB and 5C rootstocks. The changes of macro and micronutrients in leaf blades from bud burst to post harvest period were investigated in the experiment. Leaf nutrient contents of leaf blades show varied depending on the phenological stages and rootstocks (P < 0.01 and P < 0.05). Nitrogen and phosphorus content of leaf blade was decreased until veraison stage for both rootstocks. The highest potassium (K) content was obtained at blooming stage. In blooming stage nitrogen (N), phosphorus (P), potassium (K) and magnesium (Mg) nutrients was found high on 5C rootstock whereas calcium (Ca) was high on 5BB. Grapevines were found insufficient for P, K and Mg nutrients in the study. Total chlorophyll and chlorophyll a/b ratio showed significantly varied among to rootstocks and phenological stages (P < 0.01). While the highest leaf chlorophyll content was measured during flowering period it was found at the lowest through to harvest on both rootstocks. Overall total chlorophyll contents and chlorophyll a/b ratio were significantly higher on 5BB grafted vines. In the research, 5C was found to be more successful rootstock than 5BB for nutrient uptakes.

Özet: Asmanın gelişimi üzerine etkili iklim faktörlerinin başında ışık ve sıcaklık gelmektedir. Işık ve sıcaklık asmada fotosentez, solunum, asimilasyon, transpirasyon, renk pigmentlerinin oluşumu, gölgelenme, tane tutumu, asitlik, verimlilik, çiçeklenme, suda çözünebilir kuru madde birikimi, sürgün gelişimi ve olgunluk üzerine doğrudan etki etmektedir. Sıcaklık bir bölgede ekonomik anlamda bağcılık yapılıp yapılamayacağını belirleyen en önemli parametrelerden biridir. Sıcaklık; asmada gözlerin uyanması, çiçeklenme, tane tutumu, renklenme, fotosentez, solunum, tanede şeker birikimi ve olgunlaşma gibi birçok fizyolojik olayı yönetmektedir. Işık, fotosentez başta olmak üzere pek çok fizyolojik ve kimyasal olayların gerçekleşmesinde önemli rol oynamaktadır. Özellikle asmanın maksimum düzeyde fotosentez yapabilmesi için vejetasyon döneminde yeterli bir güneşlenme şarttır. Işık, karbondioksit (CO2) ve öteki etmenler sınırlayıcı olmamak şartıyla fotosentezi bir noktaya kadar arttırmaktadır. Işık miktarının azlığı kadar yüksekliği de, bitkinin gelişimi üzerine olumsuz etkide bulunabilmektedir. Düşük ışık sürgünlerde cılız gelişmeye neden olurken, yüksek ışık yoğunluğu klorofil yıkımı sonucu fotosentezi engellemektedir. Bağlarda en üst düzeyde güneşlenmeyi sağlayabilmek için uygun terbiye sistemi seçimine ve sürgün sıklığının ayarlanmasına dikkat edilmelidir.Anahtar Kelimeler: Işık, sıcaklık, asma, büyüme, gelişme, fotosentez The Role and Importance of the Light and Temperature in ViticultureAbstract: The light and temperature come at the beginning of the climatic factors that have an impact on the development of grapevine. Light and temperature have a direct impact on photosynthesis, respiration, assimilation, transpration, formation of color pigments, shading, berry set, acidity, productivity, shoot growth, blooming, soluble solid accummulation and maturation on the grapevine. Temperature is one of the most important parameters that determines whether viticulture can be made or not in an ecology. Temperature is driving several physiological processes such as bud burst, flowering, berry set, colorization, photosynthesis, respiration, sugar accimilation and ripening. In particular, in order to carry out maximum photosynthesis of vine should be sufficient sunshine in the vegetation period. On condition that carbon dioxide and other factors not be limitting, the light increases the photosynthesis up to a certain point. Not only the limited amount of the light, but also the excess of light intensity may have an adverse impact on the development of the plant. While low light causes poor development in the shoots, high light intensity prevents the photosynthesis as a result of chlorophyll degradation. In the vineyards to ensure the highest level of sunshine should be attention to the selection of appropriate training systems and canopy management.

Extreme winter temperatures during the 2018–2019 dormant season contributed to trunk collapse and complete trunk death of numerous genotypes throughout a diverse grapevine planting in eastern North Dakota, USA. Through the early portion of the dormant season, 12 genotypes were screened to identify lethal temperature exotherms of primary buds; from these results, none were anticipated to be fully prepared to survive the −37 °C minimum temperature recorded in the region. Trunk collapse, death, and survival were monitored for 35 replicated genotypes. New trunks were retrained from suckers and monitored for growth following trunk removal. Only five genotypes exceeded 50% trunk survival at the end of the 2019 growing season, ‘Valiant’, ‘King of the North’, ‘John Viola’, ‘Baltica’, and ‘Bluebell’. Following re-establishment, ‘La Crescent’ was the most vigorous genotype with the largest sucker circumference, sucker length, and internode length. Nearly all genotypes evaluated produced suckers with lengths approaching the high-wire trellis height (1.8 m), designating their potential for cordon retraining in 2020. Cumulatively, however, the lethal temperature exotherm results and the trunk survival examination indicate a harrowing need for investigation of new management practices (such as protected training systems) and the generation of new cold-hardy genotypes to enhance productivity under standard unprotected systems.