EVALUATION OF CHILLING-HEAT REQUIREMENTS OF SOME PERSIAN WALNUT CULTIVARS

A.A. Aslamarz, K. Vahdati, M. Rahemi, D. Hassani
The objective of this work was to determine the chilling and heat requirements of Persian walnut cultivars and genotypes using excised twigs. The experiment was carried out from November to March 2006 and 2007. One-year-old twigs were prepared from four cultivars and four domestic genotypes (Juglans regia L.). After leaf fall, the twigs were taken and placed in plastic bags and kept at 4±1°C to provide 400 to 1500 chilling hours. After chilling, the excised twigs were transferred to the greenhouse. The cultivar ‘Serr’ and ‘Z30’ genotype had the lowest chilling requirements (650 hours). ‘Lara’, ‘Z63’, ‘Z53’, ‘Pedro’ and ‘Z67’ showed intermediate chilling requirements, with values of 900, 900, 800, 750 and 750 hours, respectively. Finally, ‘Hartley’ completed its dormancy after the accumulation of 1000 hours, being the walnut cultivar with the highest chilling requirement in our study. The cultivars and genotypes were classified into three groups based on their heat requirements: low requirement (‘Z30’ and ‘Serr’), medium requirement (‘Z53’, ‘Z67’, ‘Lara’ and ‘Pedro’) and high requirement (‘Hartley’ and ‘Z63’).
Aslamarz, A.A., Vahdati, K., Rahemi, M. and Hassani, D. (2010). EVALUATION OF CHILLING-HEAT REQUIREMENTS OF SOME PERSIAN WALNUT CULTIVARS. Acta Hortic. 861, 317-320
DOI: 10.17660/ActaHortic.2010.861.43
https://doi.org/10.17660/ActaHortic.2010.861.43
chilling requirement, heat requirement, walnut
English

Acta Horticulturae