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Determination of the apomictic fruit set ratio in some Turkish walnut (Juglans regia L.) genotypes

Female flowers were bagged and/or pollinated with pollen of the apple cv. ‘Golden Delicious’ (Malus x domestica Borkh.), and the apomictic fruit set was determined 8 weeks after anthesis. | Turk J Agric For 30 (2006) 189-193 © TÜB‹TAK Determination of the Apomictic Fruit Set Ratio in Some Turkish Walnut (Juglans regia L.) Genotypes Bekir fiAN, Hatice DUMANO⁄LU* Ankara University, Faculty of Agriculture, Department of Horticulture, 06110, Ankara - TURKEY Received: 16.02.2005 Abstract: This study was carried out to determine the amount of apomictic fruit set in 10 Turkish walnut (Juglans regia L.) genotypes in 2001, 2002 and 2003. Yalova-1, fiebin, Bilecik, KR-1, KR-2, fien-2, 07-KOR-l, Tokat-1, Kaman-1 and Kaman-5 cultivars and selections were used in the experiment. Female flowers were bagged and/or pollinated with pollen of the apple cv. ‘Golden Delicious’ (Malus x domestica Borkh.), and the apomictic fruit set was determined 8 weeks after anthesis. The percentage of apomictic fruit set without pollination ranged from 0.5% to 1.6% in 5 walnut genotypes, namely Yalova-1, Bilecik, 07-KOR-l, Tokat-1 and Kaman-1, in the first 2 years. In the third year, the highest apomictic fruit set (6.4%) was obtained from Tokat-1 after pollination with apple pollen. Apple pollen did not induce apomixis in the other 4 genotypes. The results indicated that apomictic fruit set is insufficient for economical seed and crop production in these ten Turkish walnut genotypes. Key Words: Walnut, Juglans regia L., apomixis Baz› Türk Ceviz (Juglans regia L.) Genotiplerinde Apomiktik Meyve Tutum Oran›n›n Belirlenmesi Özet: Bu çal›flma on Türk ceviz (Juglans regia L.) genotipinde apomiktik meyve tutumu miktar›n› belirlemek için 2001, 2002 ve 2003'de gerçeklefltirilmifltir. Çal›flmada Yalova-1, fiebin, Bilecik, KR-1, KR-2, fien-2, 07-KOR-1 Tokat-1, Kaman-1 ve Kaman-5 tip ve çeflitleri kullan›lm›flt›r. Difli çiçekler keseler içerisine al›nm›fl ve/veya ‘Golden Delicious’ (Malus x domestica Borkh.) elma çiçek tozlar›yla tozlanm›fl ve apomiktik meyve tutumu tam çiçeklenmeden 8 hafta sonra belirlenmifltir. Tozlama yap›lmaks›z›n apomiktik meyve tutum oran› Yalova-1, Bilecik, .