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Preliminary results on embryo rescue for circumventing hybridization barriers in Asparagus
Marcellán, O. N; Camadro, E. L.
  • Marcellán, O. N; Universidad Nacional de Mar del Plata. Facultad de Ciencias Agrarias. Instituto Nacional de Tecnología Agropecuaria. Estación Experimental Agropecuaria Balcarce. Laboratório de Genética. Buenos Aires. AR
  • Camadro, E. L; Universidad Nacional de Mar del Plata. Facultad de Ciencias Agrarias. Instituto Nacional de Tecnología Agropecuaria. Estación Experimental Agropecuaria Balcarce. Laboratório de Genética. Buenos Aires. AR
Biocell ; 24(3): 247-251, Dec. 2000.
Article in English | LILACS | ID: lil-335892
ABSTRACT
Garden asparagus, Asparagus officinalis, is reproductively isolated from a related ornamental species with potential breeding value, Asparagus densiflorus cv. Sprengeri, by pre- and post-zygotic barriers. The latter barrier operates at the endosperm level five days after pollination in A. officinalis x A. densiflorus crosses. To try to circumvent this barrier, in vitro embryo rescue using ovule and ovary cultures was tested. Controlled interspecific crosses were made and 2,032 ovules and 826 ovaries were cultured three days after pollination under various culture media and incubation conditions. Ovaries cultured for 60 days became red (similar to mature fruits), but seed formation was incomplete. Transfer of ovules to other media was necessary to promote embryo development. The interspecific embryos increased their length from 35 microns at the initiation of culture to 1,900 microns after 120 days of culture, but seedlings were not obtained. Histological studies revealed differentiation of protoderm only. The possible causes of the failure of the embryos to complete differentiation and morphogenesis are discussed.
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Index: LILACS (Americas) Main subject: Seeds / Adenine / Cells, Cultured / Chimera / Germination / Liliaceae Language: English Journal: Biocell Journal subject: C‚lulas Year: 2000 Type: Article Affiliation country: Argentina Institution/Affiliation country: Universidad Nacional de Mar del Plata/AR

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Index: LILACS (Americas) Main subject: Seeds / Adenine / Cells, Cultured / Chimera / Germination / Liliaceae Language: English Journal: Biocell Journal subject: C‚lulas Year: 2000 Type: Article Affiliation country: Argentina Institution/Affiliation country: Universidad Nacional de Mar del Plata/AR