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Ectopic structures on roots of Helianthus annuus × H. tuberosus
A variant clone of Helianthus annuus × H. tuberosus that develop ‘root buds’ and somatic embryos from intact adventitious roots of in vitro grown plantlets is described by Fambrini et al. (pp. 145-151). These ectopic structures are initiated without exogenous hormonal treatments. Histological analysis demonstrates that they originate from cortical cells in association with the development of lateral root primordia.
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