The quality of pollen and cytogenetic changes of Scotch pine (Pinus sylvestris L.) are studied. The pines growing on different sites in Krivoy Rog (on an iron ore stock dump near a large metallurgical plant and in the tree nursery of the Krivoy Rog Botanical Garden) are compared to plants from the forest district in environmentally unpolluted Ternopol oblast. It is found that the percentage of pollen with abnormalities of development in germinating pollen tubes is 4.5-18.2 times higher and the percentage of cytogenetic abnor malities in cycling cells of sprouted seed radicles is 2-4.2 times higher than in the plants from the forest dis trict in the Ternopol oblast.

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