STUDY ON BLOOMING TIME OF APRICOT CULTIVARS
Of 147 cultivars of different geographical origin, from 1967, the blooming time in Agro Romano environment has been recorded. The blooming time was related to the temperature recorded in the period 1st of October - 15 the of February. The earliest blooming variety begins to blossom the 4 th of February, the latest one the 20 th of March; most cultivars have a blooming time inclusive from March 4th to 15th. Among the latest blossoming cultivars, the most interesting, for agronomical and pomological characteristics to be utilized for a breeding program are: S. Francesco, Early Orange, Rouget de Sernhac, Cibo del Paradiso, Ananassa, Tonda di Tossignano. Histological studies have been done on S. Castrese, Cafona and Canino carieties, to obserce possible differences in the embryo growth in relation to blooming time. Besides, twigs of S. Castrese, Cibo del Paradiso and Early Orange were drawn and subjected to a different amount of chilling (from 250 to 750 hours below 7°C) to study the influence on blooming. Before and after the chilling treatments, analysis on flower buds about aminoacids, proteins, sugar and hormones content were done to point out biochemical differences correlated to the blooming time.
Cappellini, P., Della Strada, G., Fideghelli, C., Quarta, R. and Simeone, A.M. (1981). STUDY ON BLOOMING TIME OF APRICOT CULTIVARS. Acta Hortic. 85, 123-134