Abstract
Abstract Pollen viability and meiosis of propagates of irradiated Prunus avium L. cv. Lambert were studied to investigate changes in pollen viability and induced chromosome changes. These studies revealed significant differences in pollen viability as measured by propiono-carmine stainability, among propagates and between years. Some propagates showed significantly greater annual variation than others. Propagates of a potentially chimeral nature exhibited significant variation among secondary branches, but not among the blossoms within such branches. Meiotic studies of 12 propagates with unchanged pollen viability did not show chromosomal abnormalities other than those observed in parent ‘Lambert’ material. Studies of 19 propagates with reduced pollen viability showed 11 instances of translocation or inversion hybridity, or greatly increased univalent frequency compared to the parent clone.
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