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Meiotic Chromosomes of Monoecious Kentucky Hemp (Cannabis sativa)

Margaret Y. Menzel
Bulletin of the Torrey Botanical Club
Vol. 91, No. 3 (May - Jun., 1964), pp. 193-205
Published by: Torrey Botanical Society
DOI: 10.2307/2483524
Stable URL: http://www.jstor.org/stable/2483524
Page Count: 13
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Meiotic Chromosomes of Monoecious Kentucky Hemp (Cannabis sativa)
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Abstract

Staminate plants of dioecious `Kentucky' hemp (Ky-d) and of three other dioecious strains had a heteromorphic pair of chromosomes at diakinesis and at metaphase I and were assumed to have the sex chromosome constitution XY. All analyzed plants of female-habit (Ky-[female] m) and male-habit (Ky-[male] m) `Kentucky' monoecious hemp and of a German monoecious strain lacked the heteromorphic pair as did a pistillate plant of Ky-d, and hence were presumbly XX. Ky-[male] m plants differed from other strains in having a large extra piece of heterochromatin attached to the short arm of both nucleolar chromosomes distal to the nucleolus organizer. The pachytene bivalents of hemp are characterized by proximal blocks of heterochromatin flanked by faintly-staining distal segments which terminate in deeply-staining telochromomeres. The short arms of the nucleolar chromosomes and of one other pair terminate with heterochromatic segments. Comparison of pachytene idiograms of Ky-d males (XY) and G-m (XX) failed to reveal differences which would identify the sex chromosomes at this stage.

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