. Colchicine in agriculture, medicine, biology, and chemistry. Colchicine; Colchicine. 332 Colchicine crose than either diploid or tetraploid, in this case, the 2X or 4X sugar beets. Intervarietal 3X hybrids between high-yielding tetraploids and disease-resistant diploids will prove better than any of the present tri|)loids. Large-scale production of SX seed remains a serious problem. However, the self-incompatibility of the species can be used to ad- 0 0_. '- X:!pjo, lO 15 20 23 Individual beet weight ^100GM. units Fig. —Weight of root and percentage of sucrose production does not decreas
. Colchicine in agriculture, medicine, biology, and chemistry. Colchicine; Colchicine. 332 Colchicine crose than either diploid or tetraploid, in this case, the 2X or 4X sugar beets. Intervarietal 3X hybrids between high-yielding tetraploids and disease-resistant diploids will prove better than any of the present tri|)loids. Large-scale production of SX seed remains a serious problem. However, the self-incompatibility of the species can be used to ad- 0 0_. '- X:!pjo, lO 15 20 23 Individual beet weight ^100GM. units Fig. —Weight of root and percentage of sucrose production does not decrease at same rate as in diploid when large roots are produced. The addition of another set of chromosomes does not pass the optimum for sugar production per acre. (After Peto and Boyes) vantage. This alternate planting of 4X and 2X varieties can be used. Seventy j^er cent of the seeds from the 4X plants are triploid on an open pollination basis. About 30 per cent from diploid are triploid seed. Other factors arc involved, such as maturity dates, jiollen tid^e growth, and environment that inlluences seed production. The optimum number of chromosomes has not been exceeded in the trip- ^ii-^ Through the cooperative activities of the National Institute of Genetics Laboratory of Plant Breeding, Hokkaido University, the Hokkaido Agricultural Experiment Station, and the jajKUi Beet Sugar Manufa(tiuing Company, improvement of sugar beet by means of induced polyploidy has progressed very ;. 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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