The prop roots of corn, for example, are adventitious.
Friable callus developed from leaf explants, after which adventitious buds were visible on the surface of the callus (Figure 1).
The expression of the gfp gene in the leaf explants was observed 40 50 days after inoculation (when adventitious buds or somatic embryos begin to appear) and also in the transgenic plants obtained.
After the calli regenerated adventitious roots, only one well-grown root from each transgenic callus was harvested and transferred to the root proliferation liquid medium containing 200 mg/L vancomycin and 5 mg/L kanamycin for proliferation.
The cultures were incubated at 25 ± 2°C, in the dark; adventitious roots appeared after four weeks.
These form in the nucellus, chalaza or integuments, and embryos develop from them either directly (adventitious embryony) or after 2n embryo sac (ES) formation (gametophytic apomixis).
MtN5 expression was induced very rapidly after S. meliloti inoculation in adventitious control roots, which were generated from the infection with Agrobacterium rhizogenes carrying an empty pRedRoot vector.
Therefore, it may play a crucial role in protecting the cuttings from damage caused by bacteria and fungi, mainly at the early stage after cutting, thus allowing normal adventitious root development.
After 20 d of incubation, after the cuttings had formed 5-15 adventitious roots, the nutrient solution was replaced with treatment solution composed of autoclaved 1/6 MS medium (pH 4.0), supplemented with increasing concentrations of filter-sterilized AlCl3 up to 1000 μM (dissolved in 1/6 MS).
