. Colchicine in agriculture, medicine, biology, and chemistry. Colchicine; Colchicine. 8n, 2n,8n, 2n. 2n, 2n,8n Fig. —Diagrams of longitudinal sections through the shoot apex of diploid Datura stramonium t. and three layers of periclinal chimeras. Upper left, diploid layers of tunica and corpus. Upper Right, octoploid tunica and diploid layers beneath. Lower left, first tunica diploid, second tunica octoploid, corpus diploid. Lower right, tunica diploid and corpus octoploid.' (After Blakeslee and Satina) lyzed. Three of the five chromosomes, when in trisomies, reduced the corolla in a
. Colchicine in agriculture, medicine, biology, and chemistry. Colchicine; Colchicine. 8n, 2n,8n, 2n. 2n, 2n,8n Fig. —Diagrams of longitudinal sections through the shoot apex of diploid Datura stramonium t. and three layers of periclinal chimeras. Upper left, diploid layers of tunica and corpus. Upper Right, octoploid tunica and diploid layers beneath. Lower left, first tunica diploid, second tunica octoploid, corpus diploid. Lower right, tunica diploid and corpus octoploid.' (After Blakeslee and Satina) lyzed. Three of the five chromosomes, when in trisomies, reduced the corolla in all regions, but two chromosomes decreased one region and increased another. This method was apjjlied to find the relation between whole chromosomal additions and size effects. The con- clusion was reached that size is determined by genes according to a geometric proportion. Eventually, size in Nicotiana flowers can be resolved as a "cumulative geometric ; ^^ Hexaploids combining two species of Gossypium crossed back to G. hirsuium lead to aneuploids with one or two chromosomes from the diploid species introduced in the hexaploid. The characters in- fluenced are: leaf, floral parts, size and shape of bolls, as well as fiber. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Eigsti, O. J. (Orie Jacob), 1908-; Dustin, Pierre. Ames, Iowa State College Press
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