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Influence of cytoplasm on in vitro regeneration capacity in hybrids and their segregating generations in tomato (Lycopersicon esculentum Mill)
Three tomato cultivars (Lycopersicon esculentum Mill): Rossol Selección La Consulta (R); UC 82 (U) and Platauco INTA (P), their reciprocal crosses were studied for their shoot-forming capacity. Leaf explants were cultured in vitro on Murashige and Skoog (MS) medium with AIA 0.175 mg/l + BA 2.25 mg/l...
Three tomato cultivars (Lycopersicon esculentum Mill): Rossol Selección La Consulta (R); UC 82 (U) and Platauco INTA (P), their reciprocal crosses were studied for their shoot-forming capacity. Leaf explants were cultured in vitro on Murashige and Skoog (MS) medium with AIA 0.175 mg/l + BA 2.25 mg/l (M₁) and with BA 1.125 mg/l (M₁₁). Shoot-forming capacity was evaluated through two measures: the development rate (DR): proportion of explants with calli and/or shoots, and prolificity rate (Pr): proportion of shoots to developed explants. No differences among cultivars were found in both media for DR and Pr. In M₁, significant differences between reciprocal crosses (R × U – U × R) were found for Pr (t = 1.8; p < 0.05). F₂ plants were obtained by selfing the F₁ and 171 of the former had the U cytoplasm while 85 had the R one. The U cytoplasm Pr was 2.43 and R was 1.93 (t = 2.81; p < 0.01). These results would indicate that the cytoplasm effects on regeneration are still active in the F₂ generation. Since it can be inferred that the genetic variability for the regeneration ability might be inhibited by cytoplasmic effects.
