Abstract Doubled haploid (DH) technology allows for
the production of pure lines, useful for plant breeding,
through a one-generation procedure that reduces considerably
the time and resources needed to produce them.
Despite the advantages of microspore culture to obtain
DHs, this technique is still insufficiently developed in
eggplant, where DHs are produced from microsporederived
calli through organogenesis. At present, very little
is known on the best in vitro conditions to promote this
process. This is why in this work we addressed the optimization
of the process of regeneration of eggplant DH
plants from microspore-derived calli. We evaluated the
effect of different media compositions in the induction of
organogenesis, in the promotion of shoot growth and
elongation, and in root growth. According to our results,
we propose the repeated subculture of the calli in MS
medium with 0.2 mg/l IAA and 4 mg/l zeatin to produce
shoots, and then the repeated subculture of the excised
shoots in basal MS medium to promote their conversion
into entire plantlets. This procedure yielded 7.6 plants per
100 cultured calli, which represents a *49 increase with
respect to previous reports. We also evaluated by flow
cytometry and SSR molecular markers the effect of these
in vitro culture conditions in the rate of DH plant production,
finding that*70 % of the regenerated plants were
true DHs. These results substantially improve the efficiencies
of DH recovery published to date in eggplant, and
may be useful to those working in the field of eggplant
doubled haploidy and breeding.
Abstract Doubled haploid (DH) technology allows forthe production of pure lines, useful for plant breeding,through a one-generation procedure that reduces considerablythe time and resources needed to produce them.Despite the advantages of microspore culture to obtainDHs, this technique is still insufficiently developed ineggplant, where DHs are produced from microsporederivedcalli through organogenesis. At present, very littleis known on the best in vitro conditions to promote thisprocess. This is why in this work we addressed the optimizationof the process of regeneration of eggplant DHplants from microspore-derived calli. We evaluated theeffect of different media compositions in the induction oforganogenesis, in the promotion of shoot growth andelongation, and in root growth. According to our results,we propose the repeated subculture of the calli in MSmedium with 0.2 mg/l IAA and 4 mg/l zeatin to produceshoots, and then the repeated subculture of the excisedshoots in basal MS medium to promote their conversioninto entire plantlets. This procedure yielded 7.6 plants per100 cultured calli, which represents a *49 increase withrespect to previous reports. We also evaluated by flowcytometry and SSR molecular markers the effect of thesein vitro culture conditions in the rate of DH plant production,finding that*70 % of the regenerated plants weretrue DHs. These results substantially improve the efficienciesof DH recovery published to date in eggplant, andmay be useful to those working in the field of eggplantdoubled haploidy and breeding.
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