Viability of Seed from Interspecific Crosses with Naranjilla (Solanum quitoense)1
- H. E. Vivar and
- A. M. Pinchinat
Naranjilla (Solanum quitoense Lam.) lacks several of the agronomically desirable traits possessed by the less economically important S. hirsutissimum Stanley, S. hirtum Vahl, S. tequilense Gray, and S. topiro Humb. & Bonpl. These five species, according to routine cytological checks, showed a common somatic chromosome number (2n=2x=24), medium to high pollen viability (65 to 90%), and predominantly normal chromosome pairing at meiosis (12 bivalents). Reciprocal crosses between naranjilla and each of the other four species produced seed in all but two combinations (S. quitoense ✕ S. topiro and S. quitoense ✕ S. tequilense) but seed from only the crosses involving S. hirtum as one of the parents germinated. Moreover, percent germination of the S. hirtum ✕ S. quitoense seed was considerably higher (above 50%) than that of the reciprocal cross (below 0.5%). Nonviable hybrid seed looked thin and translucent, suggesting a lack of functional endosperm. Thus, special breeding techniques such as embryo culture may be required to successfully raise F1 plants from such seed.Please view the pdf by using the Full Text (PDF) link under 'View' to the left.
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