Abstract
A radiation-induced chimeric flower colour sport of vegetatively propagated Rhododendron simsii Planch. was recurrently irradiated (up to three times in three consecutive years) with soft X-rays (50kV-30mA), as compared to a single treatment. Because of the low true flower colour mutation frequency the efficiency of the different radiation treatments was compared on the basis of the number of chimeric rearrangements in flower structure i.e. the flower colour change from red with broad white edge towards either homogeneous carmine-red or white. It is quite clear that recurrent irradiation with appropiate doses is most efficient.
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