Abstract
The effect of gamma radiation upon pollen was studied in populations of 4 China aster varieties in M<sub>1</sub> (plants from irradiated seeds) and M<sub>2</sub> generation. Effect of radiation Was assessed·in partiicular years. Comparison was rnalde between pollen vitality in irradiated plants and in the control. Effect of radiation was visibly harmful only in case of plants from M<sub>1</sub> generation. The effects of radiation were different for particular varieties.
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