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Origin and development in vitro of shoot buds and somatic embryos from intact roots of Helianthus annuus x H. tuberosus
- Fambrini, M., Cionini, G., Conti, A., Michelotti, V., Pugliesi, C.
- Annals of botany 2003 v.92 no.1 pp. 145-151
- Helianthus annuus, oilseed crops, Helianthus tuberosus, Jerusalem artichokes, hybrids, clones, phenotype, plant development, plant growth, totipotency, in vitro culture, in vitro regeneration, shoots, buds, roots, stems, somatic embryos, somatic embryogenesis, cell differentiation, micropropagation, leaves, plant architecture, plant morphology, plant anatomy, cell proliferation, callus, histology
- A variant clone of the tetraploid (2n = 4x = 68) interspecific hybrid Helianthus annuus x H. tuberosus derived by in vitro tissue culture showed a deviation from the usual pattern of organization of the plant body. This variant developed shoot-like structures and somatic embryos from intact adventitious roots of in vitro-grown plantlets. The morphogenetic structures were not normally able to differentiate complete plants. They did show cellular proliferation with the inception of additional secondary embryos, leaf-like structures and unorganized masses of callus. Nevertheless, some ectopic structures isolated from roots and transferred onto fresh basal medium without growth regulators were able to produce plantlets that exhibited the same phenotype as the original clone. Histological analyses demonstrate that they originate from cortical cells in association with the development of lateral root primordia.