late spring frost damage is the main factor that limits apricot production in iran.this research was aimed to evaluate the damage of freezing in two apricot cultivarflowers: ʽʽnasiriʼʼ and ʽʽnori-dirrasʼʼ during spring 2011. reproductive organs of thesecultivars at two phenological stages, popcorn and full bloom, were transferred toprogrammable freezer with temperature touch down from 5°c to -1...