Effects of freeze injury to the various tissues of young developing fruits were studied anatomically and illustrated by photomicrographs. Samples had been obtained just prior to the freeze so that normal and injured tissues can be compared.
In the apricot, disrupted tissue appeared in the following areas: vascular bundle tissues in the mesocarp, general destruction of the endocarp, ovullary tissue destruction with separation of the outer and inner integuments and a distinct injury occurring in the chalazal end of the ovule.
The same general pattern of tissue injury occurred for the sweet cherries as that which was evident in the apricot. However, injury at the base of the fruit was not as intense as that of the apricot. The ‘Stark Gold’ cherry, which was 2-3 days later in development than the ‘Starting Hardy Giant’, was less severely injured because the floral cup base provided some protection. It also had 4-6 hypodermal layers as compared to 2 layers in the ‘Starking Hardy Giant’.