Triploid hybrids

Brown, C. R. (1988). Charaeteristies of 2n pollen produeing triploid hybrids between Solanum stoloniferum and eultivated diploid potatoes. American Potato Journal, 65, 75-84. 

On the other hand, colchicine s ability to induce polyploidy can solve many important problems of plant breeding. Colchicine renders infertile hybrids fertile. For example, the maximum Fuchsia species are diploid or tetraploid. The cross between diploid and tetraploid results often in a triploid, which is mostly sterile because the process of meiosis requires the pairing of similar chromosomes and due to lack of mechanism to allow the alignment of three similar chromosomes. However, colchicine treatment produces fertile hexaploid plants. Breeding of triticale from wheat and rye shows similar problem wheat is typically tetraploid and rye is diploid, with the triploid hybrid being infertile. Here also, treatment with colchicine results in fertile hexaploid triticale. 

S. X juzepczukii Buk., a natural triploid hybrid of S. stenotomum and S. acaule But., a frost-resistant wild species of ser. 17. Acaulia and characterized by the occuuence of demissine/tomatine beside solanidine... 

All species of Larix, like most other genera in the Pinaceae, have a haploid number of 12 chromosomes (Wright, 1962). Polyploidy and aneuploidy are rare in conifers. A cross between L. occidentalis and L. decidua (European larch) produced a single triploid hybrid (Larsen and... 

Larsen, C.S. and M. Westergaard. 1938. Contributions to the cytogenetics of forest trees. I. A triploid hybrid between Larix decidua and L. occidentalis. J. Genet. 36 523-530. 

PARSONS J E, BUSCH R A, THORGAARD G H and scHEERER p D (1986), Increased resistance of triploid rainbow trout x coho salmon hybrids to infections hematopoietic necrosis virus, Aquaculture, 15,337-343. 

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