PARTHENOGENESIS IN TETRAPLOID LILIUM LONGIFLORUM

Emsweller , S. L., and Joseph Uhring . (U.S.D.A., Beltsville, Md.) Parthenogenesis in tetraploid Lilium longiflorum. Amer. Jour. Bot. 49(9): 978–984. Illus. 1962.—Nine maternal polyhaploids from 1 capsule and 1 tetraploid from another were produced following pollination of 2 tetraploid Lilium longiflorum plants with pollen from diploids of the same species. One of the 9 plants had 25 chromosomes; the extra chromosome was identified as a modified D. Two other plants had 2 new chromosomes each and the remaining 6 had 24 unmodified chromosomes. Translocations in meiosis of the tetraploid produced the new chromosomes. One plant obtained from a second capsule had 48 chromosomes. The 9 plants were smaller than diploids and the 48-chromosome plant was considered a diploid until mitosis was observed. The 9 plants originated from unfertilized eggs of the tetraploid, and the 48-chromosome plant presumably from chromosome doubling of an egg cell.