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Changes in morphological phenotypes and essential oil components in lavandin (Lavandula x intermedia Emeric ex Loisel.) transformed with wild-type strains of Agrobacterium rhizogenes


Changes in morphological phenotypes and essential oil components in lavandin (Lavandula x intermedia Emeric ex Loisel.) transformed with wild-type strains of Agrobacterium rhizogenes



Scientia Horticulturae 130(3): 647-652



ISSN/ISBN: 0304-4238

DOI: 10.1016/j.scienta.2011.08.011

Hairy roots were induced from leaf-derived calli of lavandin (Lavandula x intermedia Emeric ex Loisel.) by infection with wild-type strains of Agrobacterium rhizogenes, A-5 (MAFF 02-10265) and A-13 (MAFF 02-10266). A-5-inoculated calli formed hairy roots more efficiently than A-13 ones. The transgenic shoots could be obtained from hairy root segments mediated by each Agrobacterium strain. However, different plant growth regulators were required for efficient adventitious shoot formation in each strain. In A-5, the most efficient adventitious shoot formation rate of 23.8% was observed in a medium with 4.4 x 10(-6) M of 6-benzylaminopurine. On the other hand, a significantly higher rate of 13.2% was detected in a medium with 4.0 x 10(-7) M of N-(2-chloro-4-pyridyl)-N'-phenylurea in A-13. Most of the regenerated plants showed dwarfism with closed internodes and extensive lateral branching, which were typical characteristics of 'hairy root syndrome'. On the other hand, only nine of the 45 regenerated plants formed flower buds in early June, a delay of about one month compared with nontransgenic regenerated plants. The floral stalks and spikes of these plants were very short, resulting in a compacted form. Many regenerants showed a significantly lower productivity of essential oil than nontransgenic regenerants. Moreover, the relative percentage of the linalyl-cation-derived compounds, linalool and linalyl acetate, decreased in most of the regenerated plants. Compact plants with the ability of flower bud formation are assumed to be valuable not only for lavandin breeding, but also for clarifying the interaction between rol genes expression and essential oil production. All rights reserved.

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