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Aneuploids in Safflower¹

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.

Key Words: Meiosis • Trisomic • Double trisomic • Triploid • Tetraploid • Carthamus tinctorius L.

² Associate professor, Univ. of Tehran, and professor of agronomy, Univ. of California, Davis.

Received for publication August 6, 1979.