Abstract
Hybrid between Solanum gracile naturalized in New Zealand and an Indian race of S. nodiforum had 84.3% pollen sterility and did not set seed. Chromosome pairing observed at late diakinesis suggests that the genomes of the two species differ in at least three pairs of chromosomes and probably two of these three pairs are involved in a translocation for a short segment. Sterlity of the F1 hybrid is largely due to genic imbalance of the gametes rather than due to chromosome numerical imbalance.
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