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Abstract


PHENOLOGIC OBSERVATIONS ON WALNUT GENOTYPES

Variation in the phenology of plants is one of the most sensitive ecological responses to climate change. Changes to species’ phenology can have a wide range of impacts on agriculture and forestry. Early bud-break is a limiting factor for commercial walnut growing like other species. Frequent late-spring frosts may damage flowers, buds, or nuts at the beginning of their development. For this reason it is very important to know phenology of cultivars. In this study, we determined phenology of 42 walnut genotypes which are grown under same ecological conditions. Date of terminal bud burst differed between mid march and april. The earliest burst of male flowers date was April 5 while the latest date was May 1. First female bloom of walnut genotypes/cultivars changed between April 7 and May 10. We observed that most of genotypes had protandry. In general fruit maturation occurred in the second part of September. Leaf drop started November 9 and finished December 15.



Keywords
Walnut, Juglans regia L., phenology, flowering, defoliation



Kaynakça Cerovic, S., Gološin, B., Todorovic, J.N., Bijelic, S., Ognjanov, V. (2010): Walnut (Juglans regia L.) selection in Serbia. Hort. Sci. 37(1): 1-5. Colaric, M., Štampar, F., Hudina, M., Solar, A. (2006): Sensory evaluation of different walnut cultivars (Juglans regia L.), Acta Agriculturae Slovenica, 87 – 2: 403 – 413. Elaine, B., Feldman, M.D. (2002): The scientific evidence for a beneficial health relationship between walnuts and coronary heart disease, J. Nutr.132, 1062-1101. Fukuda, T., Ito, H., Yoshida, T. (2003): Antioxidative polyphenols from walnuts (Juglans regia L.), Phytochemistry 63, 795-801. Germain, E. (1997): Genetic improvement of the Persian walnut (Juglans regia L.), Acta Hortic. 442:21-32. Orman, E., Hepaksoy, S. (2016): Fruit and tree characteristics of some Turkish walnut genotypes, Bahçe 45:1 (Special Ed 1) 668–673. Orman, E., Hepaksoy, S. (2017): Physical properties of some indigenous walnut genotypes and determination of crust breaking resistance. Bahçe 46 (Special Ed 2): 141–147. Orman, E., Hepaksoy, S., Taş, A., Berk, S., Geçer, M.K., Gündoğdu, M. (2018): Determination of fruit and tree characteristics of some Turkish walnut genotypes in Yalova climatic conditions, Bahçe 47 (Special Ed 2): 69-77. Ölez, H., 1971. Marmara Bölgesi Cevizlerinin (J. regia L.) Seleksiyon Yoluyla Islah Üzerinde Araştırmalar. (Doktora Tezi). Ankara Üniversitesi Ziraat Fakületesi Bahçe Bitkileri Bölümü, Ankara Ramos, E.D. (1998): Walnut Production Manual, University of California, Division of Agriculture and Natural Resources, Communication Services Publication. Publication 3373, Oakland, California, USA. Sharma, S. (2004): Studies on characterization and variation in walnut germplasm of diverse origin. M Sc thesis, submitted to the department of fruit breeding and genetic resources, Dr. Y.S. Parmar University of Horticulture and Forestry, Nauni, Solan, India. Sharma, R.M., Kour, K., Singh, B., Yadav, S., Kotwal, N., Rana, J.C., Anand, R. (2014): Selection and characterization of elite walnut (Juglans regia L.) clone from seedling origin trees in North Western Himalayan region of India. AJCS 8(2):257-262. Tosun, İ., Akçay, M.E.: (2005): Phenological and pomological properties of some walnut varıeties in Yalova ecological conditions, Bahçe 34 (1): 35 – 39.

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