Abstract
For temperate-zone fruit species such as apricot, dormancy overcoming may be problematic when cold requirements are not adequately satisfied, with negative repercussions on productivity. The aim of this research was to study the relationship between the dormancy evolution and the climatic conditions in different apricot cultivars growing in two environmental areas (Italy, Tuscany: lat. 43°02'N, long. 10°36'E; Spain, Murcia: lat. 38°16'N, long. 1°16'O). Trials were conducted for two consecutive growing seasons on the same genotypes: 'Currot', 'San Castrese', 'Goldrich', 'Stark Early Orange', 'Orange Red'. The Chilling Requirements (CR), date of the beginning of flowering, blooming and fruiting entity were estimated. Temperatures were recorded and transformed into the corresponding Chill Units (CU) by modified Utah Model. Results obtained in two different areas showed the possible role of environmental conditions as regulatory factor in the dormancy process. A strong influence of climatic factors that can interfere with genotype and consequently alter the flowering process is hypothesized.
Published Version
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