New Zealand Journal of Crop and Horticultural Science abstracts

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Identification of superior walnut (Juglans regia) genotypes in north-eastern Anatolia, Turkey

Rafet Aslantaş

Department of Horticulture
Faculty of Agriculture
Ataturk University
25240 Erzurum, Turkey
email: aslantas@atauni.edu.tr

Abstract This research was conducted to identify promising native walnut (Juglans regia) trees growing wild in the Çoruh Valley, north-eastern Anatolia, Turkey. The research material consisted of uncultivated walnut trees. From c. 39 000 trees growing in the region, 20 genotypes with superior yield and fruit characteristics were selected and evaluated. These genotypes were resistant to anthracnose and early autumn–late spring frost injuries. The ranges of average fruit characteristics determined for the selected genotypes were: 85–100% terminal fruitfulness; 40–63% lateral fruitfulness; 2.24–3.20 fruits per terminal shoot; 1.45–2.15 fruits per lateral shoot; 9.07–16.01 g nut in shell weight; 5.00–7.37 g kernel weight; 45.66–67.14% kernel ratio; and 0.58–1.53 mm shell thickness. The best genotypes were CVWS 13, 46, 138, 150 and 193. These types had thinner shell (0.58 mm, CVWS 13), heavier kernel (7.37 g, CVWS138), and more lateral fruitfulness (63% CVWS 193 and 60% CVWS 46 and CVWS 150). Selected walnut genotypes in the Çoruh Valley will be used for further breeding purposes in terms of yield capacities, nut characteristics, and cold hardiness.

Keywords walnut; Juglans regia; genetic resources; nut characteristics

New Zealand Journal of Crop and Horticultural Science, 2006, Vol. 34: 231–237
0014–0671/06/3403–0231      © The Royal Society of New Zealand 2006
H05160; Online publication date 31 July 2006. Received 16 December 2005; accepted 14 April 2006

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