Efficiency of Single-Seed-Descent vs. Anther-Derived Dihaploid Breeding Methods in Tobacco1
- R. J. Schnell,
- E. A. Wernsman and
- L. G. Burk2
The productivity and leaf chemical composition of random dihaploid (DH) and single-seed-descent (SSD) lines of Nicotiana tabacum L. from the same F1 hybrid plant, were compared. ‘Hicks Broadleaf’ was crossed with ‘Coker 139,’ anthers from a single F1 plant were cultured, and 50 DH lines were produced for testing. The same F1 was selfed, and 50 random F8 lines were developed by the SSD procedure. Experimental lines and check cultivars were compared in three environments.
The DH population yielded 10.6% less cured leaf, possessed inferior leaf quality, was later flowering, produced reduced leaf numbers, and its cured leaf was lower in total alkaloids than the SSD population. The antherculture procedure produced a DH population with greater genetic variability for leaf yields than the conventionally-inbred population, but the suppressed DH mean overwhelmed the benefit of increased variation. Results indicate that selection in SSD populations would be preferable to selection in DH population for the identification of superior genotypes.Please view the pdf by using the Full Text (PDF) link under 'View' to the left.
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