. Genetics in relation to agriculture. Livestock; Heredity; Variation (Biology); Plant breeding. SPECIES HYBRIDIZATION 239 characters, however, it crosses freely with members of the labacum group, and yiekis reciprocal hybrids which are equivalent throughout. In Fig. 103 on the right is illustrated a plant of A*', tabacum angustifolia and beside it the Fi hybrid with N. sylvesiris. The figure shows clearly how faithfully the characters of the N. tabacum parent are reproduced in the hybrid. The leaves are long, narrow and pctioled, the upper ones strap-like and pendant, the flowers are narrow a
. Genetics in relation to agriculture. Livestock; Heredity; Variation (Biology); Plant breeding. SPECIES HYBRIDIZATION 239 characters, however, it crosses freely with members of the labacum group, and yiekis reciprocal hybrids which are equivalent throughout. In Fig. 103 on the right is illustrated a plant of A*', tabacum angustifolia and beside it the Fi hybrid with N. sylvesiris. The figure shows clearly how faithfully the characters of the N. tabacum parent are reproduced in the hybrid. The leaves are long, narrow and pctioled, the upper ones strap-like and pendant, the flowers are narrow and have narrow, sharply. Fig. 102.—Typical plant of Nicotiana syhj':stns. pointed lobes—these and the general habit of growth are all characters clearly referable to the A^. tabacum parent. A very different variety of tabacum, such as the variety known in the University of California Bot- anical Garden cultures as N. tabacum " Cuba" gives corresponding results. This variety is tall and bears white flowers many of which are quadrimer- ous instead of pentamerous as is normally the case in Nicotiana. These characters are faithfully reproduced in the hybrid with sylvestris as is shown in Fig. 104. N. tabacum "Cuba" is peculiar among the tabacum varieties in its ability to develop seed capsules in the absence of fertiliza- tion, and these may sometimes contain a few viable seeds. This is appa- Digitized by Microsoft®. 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 Babcock, E. B. (Ernest Brown), b. 1877; Clausen, Roy Elwood, 1891-. New York, McGraw-Hill; [etc. , etc. ]
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