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Crop Science Abstract -

Aneuploids in Safflower1


This article in CS

  1. Vol. 20 No. 4, p. 516-518
    Received: Aug 6, 1979

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  1. A. Estilai and
  2. P. F. Knowles2



Triploids found in populations of autotetraploids of cultivated safflower (Carthamus tinctorius L.) were assumed to be products of outcrosses to diploid plants during the previous generation. The progenies of open-pollinated triplolds had 2n=24, 25, 26, 46, 47, and 48 chromosomes. The plant with 25 chromosomes was a primary trisomic whose PMCs showed 12 bivalents plus one univalent or 11 bivalents plus one trivalent at metaphase I. The plant with 26 chromosomes was considered to be a double trisomic of a 2n + 1 + 1 type which showed chromosome associations of 12II + 2I, llII + lIII + lI, and 10II+ 2III. The expected frequencies of one trivalent in the 2n + 1 plant and two trivalents in the 2n + 1 + 1 plant were compared with their respective observed values.

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