Presence Of IBA Research Articles

In vitroplantlet regeneration from adventitious buds of chestnut

SummaryA method is described to induce the differentiation of adventitious roots and buds in hypocotyl and epicotyl sections from 3-5-week-old chestnut plantlets grown in vitro. For rhizogenesis 0.1 mg l-1 of NAA or IBA was used, and BAP was necessary for bud induction. The highest rates of bud differentiation were obtained with 2 mg l-1 of BAP and 0.01 mg1-1 of NAA or IBA. Adventitious buds were multiplied in a low mineral medium with Heller’s macronutrients and 0.1 mg l-1 of BAP. The presence of IBA was necessary in the rooting stage, but no advantage was observed in reducing the sucrose level or the temperature.

In vitro plantlet regeneration through asexual embryogenesis in cotyledonary segments of Corylus avellana L.

Cotyledonary nodes of corylus avellana L. excised from young seedlings cultured in K(h) medium for 5 weeks were used to induce embryoid formation. Embryogenesis was achieved in 60% of the explants over two 20-day culture steps in the presence of IBA (5 μM) plus BAP (0.5 μM) and BAP (5 μM) plus IBA (0.5 μM) respectively. Subsequent proliferation was successfully maintained during 5 subcultures on K(h) basal medium and in an unlimited number of subcultures in the presence of BAP (0.5 μM). Plant regeneration (50-55%) was easily achieved by planting into a basal K(h) medium after 10-20 days.

In vitro vegetative multiplication of Fuchsia hybrida

Rapid development of axillary buds from shoot-tips and nodes of 18 cultivars of Fuchsia hybrida was obtained on solid Murashige and Skoog medium with BAP (1 mg l −1 and an auxin (0.1 mg l −1). NAA as the auxin appeared to be more active than IAA or IBA. Vegetative shoots were subsequently isolated and developed up to 15 supplementary axillary shoots on the same solid medium. Agitated and non-agitated liquid media of the same composition were less effective. One-cm long shoots could be rooted in 20 days in the presence of IBA before being transferred to soil.

Multiple shoot-bud formation and plantlet regeneration on Castanea sativa Mill. seeds in culture

Primordial initiation and development of shoot-buds has been accomplished by using shoots derived from chestnut (Castanea sativa Mill) seedlings cultured with added 6-benzylaminopurine (BAP). Germination of chestnut seeds in the presence of BAP (4 - 40 μM) stimulated varying numbers of shoot-buds in those areas of the main axis that were favorably altered. When excised single shoots from these treated seeds were subcultured on a fresh medium containing BAP (4 - 40 μM) continual shoot production was observed. Bud growth and shoot elongation were stimulated by transferring cultures to a reduced concentration of BAP (2 μM) plus indole-3-butyric acid (IBA 0.4 μM). Plant regeneration occurred in the presence of IBA (0.8 μM) after a preconditioning treatment in which naphthaleneacetic acid (NAA 50 μM) and kinetin (k 2 μM) were applied to the tissue culture shoots for 7 days in light.

Auxin synergists in the rooting of mango cuttings

Preplanting application of phenolic compounds, p-hydroxybenzoic acid p-coumaric acid and ferulic acid, in most cases promoted auxin-induced rooting on cuttings of mango, a difficult-to-root fruit plant. The ethylene-releasing chemical CEPA (ethrel, ethephon) also stimulated rooting in the presence of auxins. Synergism was more pronounced in the presence of IBA than with IAA. To a certain extent, root-promoting effects of auxins and non-auxin chemicals were related to the utilization of carbohydrate fractions from the region of root formation. Utilization of reserve polysaccharides assumed greater importance only during the root-development phase.