F IVE years ago an American variety of tetraploid rye, produced byDORSEY (1936) by means of the heat shock method, was kindly sent to me.Together with other tetraploid rye varieties later on produced with colchicine this American tetraploid variety was studied with regard to morphology, fertility and chromosomal variation.In this report the apparent production of parthenogenetic diploids and the correlation between aneuploidy and seed shrivelling will be briefly considered.
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ARNE MÜNTZING (2010) studied this question.
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