METAPHASE I STUDIES ON F1MONOSOMICS FROM CROSSES BETWEEN THE CHINESE SPRING AND CHEYENNE COMMON WHEAT VARIETIES

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Abstract
Crosses were made between the 21 different monosomic strains of the hard red spring variety, Chinese Spring, and the hard red winter variety, Cheyenne. The F1 monosomic plants were observed at metaphase I of meiosis. Measurements of the Cheyenne monosomes gave a range of mean lengths 4.21 microns for 6D to 7.22 microns for 3B. Cheyenne monosomes 1B and 6B each had a constriction and satellite in one arm, 5D had a right-angled curve resembling a satellite at the end of one arm, 5A and 5B had crooks, and 6D was unusually compact No reciprocal translocations were observed. The average number of unpaired chromosomes per cell (other than the monosome) ranged from .23 for 5D monosomic plants to .86 for 2D. Nine disomic sister plants had a mean of .54 unpaired chromosomes per cell.