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Inheritance of in vitro plant regeneration ability in the tomato

Ricardo T. Faria; Rolf D. Illg

Departamento de Genética, Instituto de Biologia, Universidade Estadual de Campinas, Caixa Postal 6109, 13083-970 Campinas, SP, Brasil. Send correspondence to R.D.I.

ABSTRACT

Lycopersicon pimpinellifolium, with high plant regeneration ability, used as a pollen donor, was crossed with five recalcitrant L. esculentum genotypes. Statistical analysis was based upon frequency data of calluses that regenerated plants (R) in F₁, F₂, BC₁ and on reciprocal crosses, with genotypes that did not regenerate plants (NR). F₁ hybrids showed a dominance effect; no differences were observed in reciprocal crosses. The F₂ rate was close to 9:7 (R:NR) and BC₁ expressed a 1:3 (R:NR) rate. The results suggest an interaction of two dominant genes, indicating that the transfer of high plant regeneration ability from wild to commercial varieties would be relatively easy, since a qualitatively inherited dominant trait is involved.

Keywords: inheritance; plant regeneration; tomato.

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