. Contributions from the Laboratory of Plant Genetics. CROSSES BETWEEN XICOTIANA LANGSDORFFII AXD N. ALATA 323 ized naturally. N. alata is often self-fertilized, but evidence of consider- able cross-fertilization has been found by observing the actions of Sphingidae in the evening, by isolating plants, and by self-sterility studies. Though the coefficient of variability ( ± .42 percent) is almost as. Figure 3 Figure 4 Figure 3. A, N. alata grandiflora; B, Fx of X. Langsdorffii X -V. alata grandiflora; C, N. Langsdorffii (1911) X V2. Figure 4. D and E, extremes of the F2 generation (191^) X
. Contributions from the Laboratory of Plant Genetics. CROSSES BETWEEN XICOTIANA LANGSDORFFII AXD N. ALATA 323 ized naturally. N. alata is often self-fertilized, but evidence of consider- able cross-fertilization has been found by observing the actions of Sphingidae in the evening, by isolating plants, and by self-sterility studies. Though the coefficient of variability ( ± .42 percent) is almost as. Figure 3 Figure 4 Figure 3. A, N. alata grandiflora; B, Fx of X. Langsdorffii X -V. alata grandiflora; C, N. Langsdorffii (1911) X V2. Figure 4. D and E, extremes of the F2 generation (191^) X V2. low as that of Xo. 328, therefore, it is probable that No. 321 is not so nearly homozygous. Furthermore, the number of individuals measured is small. On the other hand, since a single plant of No. 321 was used in the cross, it is possible that the true variability of this "blood" intro- duced, is somewhat smaller than that represented by the frequency distribution. Curiously enough the mean of the Fx population is smaller than the average of the two parents. Thus there apparently is no effect of heterosis on the flowers. The square root of the Fx mean is more nearly Genetics 1: Jy 1916. 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 Bussey Institution. Boston : [s. n. ]
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