Premium
Viability of Seed from Interspecific Crosses with Naranjilla ( Solanum quitoense ) 1
Author(s) -
Vivar H. E.,
Pinchinat A. M.
Publication year - 1970
Publication title -
crop science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.76
H-Index - 147
eISSN - 1435-0653
pISSN - 0011-183X
DOI - 10.2135/cropsci1970.0011183x001000040041x
Subject(s) - biology , botany , endosperm , pollen , germination , solanum , reciprocal cross , interspecific hybridization , hybrid
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 F 1 plants from such seed.