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Inheritance of fineness of lint in Upland cotton



Inheritance of fineness of lint in Upland cotton



Crop Sci 3(2): 163-165



By use of the arealometer, fine and coarse lines of Upland cotton were identified and isolated. Kime's Fine is the fine-lint line, and Half and Half and Florida Green seed are the coarse-lint lines. The 2nd coarse-lint line is very coarse. Kime's Fine was crossed with both Half and Half and Florida Green Seed. Parent lines, F1's, F2's, and 3 stages of backcrosses were grown. The growth phase of the experiment extended over 1944-1947. The parent lines as set up and grown the 1st year were repeated each of the 3 following years for possible further use in crossing, in backcrossing, and as standards of comparison for the data of the hybrid phases. F1 data indicate intermediate inheritance, but in the several comparisons, a particular F1 mean is somewhat more often slightly on the coarse side than likewise on the fine side of the mid-value of the parent lines. Comparison of the average of the 3 F1 means with the average of the possible 8 mid-parental mean values shows the former average at a level only a shade coarser. On carrying out this procedure of computation, the F1 average mean value would be at the level of 401 arealometer units and the mid-parental average mean value at the level of 414 arealometer units. The plant frequency arrays of the F2 of both cross groups are monomodal and follow about the same pattern of distribution, but they are considerably more widespread than any of the F1 arrays. The means of the 2 F2 populations also are much alike. They are at about the same level. As in the F1's, the positions of the F2 distributions and their means tend to show more influence of the coarser parent than of the finer parent. The phases of backcrossing also tend to show some dominance of the coarse parent, but the influence is not great enough to prevent shifting toward the finer parent when it is involved as the recurrent parent.

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