. Bulletin. 1901-13. Agriculture; Agriculture. HEREDITY AND COTTOX BREEDING. taneoiis clianoe of expression of many characters is especially impor- tant. It enables most of the mutations to be detected early in the season before they have reached the flowering stage. Otherwise thej'' furnish pollen for infecting the seed of their neighbors, with the tendency to degenerate variation. Selection ap- plied at the end of the season is much less effec- Though mutative de- generations can usually be detected by observing the lint and seed cliaracters, it is a much easier method, as well as mor
. Bulletin. 1901-13. Agriculture; Agriculture. HEREDITY AND COTTOX BREEDING. taneoiis clianoe of expression of many characters is especially impor- tant. It enables most of the mutations to be detected early in the season before they have reached the flowering stage. Otherwise thej'' furnish pollen for infecting the seed of their neighbors, with the tendency to degenerate variation. Selection ap- plied at the end of the season is much less effec- Though mutative de- generations can usually be detected by observing the lint and seed cliaracters, it is a much easier method, as well as more etfective, to recognize them from the external vegetative characters of the plants. An example of the extent to Avhich mutations often differ from the parent type in lint characters is shown in figure 10, where three seeds from a degen- erate mutation are com- pared with tw^o seeds from an adjacent normal plant in a field of the Lone Star variety at Waco, Tex., in the season of 1911. Though the seed differences are obvious enough when the lint is combed out, this Avould be unnecessary in actual ]iractice, for the plants that produced the inferior lint could be distinguished from the Lone Star tjq^e by simple inspection in the field. For a farmer sufficiently familiar with his variety, the removal of such plants would take no more time than pulling an equal number of weeds and would be much more important for the welfare of the crop. ^Cook, O. F. Cotton Selertion on the Farm by the Characters of the Stalks, Leaves, and Bolls. Circular GO, Bureau of Plant nKlnstry, T'. S. Dept. of Agriculture. 1010. 256. Fig. 11.—Bractlike loaf of Willet Red Leaf variety of rpland cotton. (Natural size.). 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 United States. Bureau of Plant Industry, Soils, and Agricultural Engine
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