EVALUATION OF CHILLING-HEAT REQUIREMENTS OF SOME PERSIAN WALNUT CULTIVARS
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
DOI: 10.17660/ActaHortic.2010.861.43
https://doi.org/10.17660/ActaHortic.2010.861.43
chilling requirement, heat requirement, walnut
English