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Alessandro Chiari and Mark P. Bridgen

Three Alstroemeria genotypes—A30, ER292, and 16-1-2—developed at the Univ. of Connecticut were grown in vitro on two media: Murashige and Skoog (MS) basal medium and Alstroemeria medium (ALA). Each medium had four levels of 6-benzylaminopurine (BA) added: 0, 9, 18, and 36 μm. Alstroemeria rhizomes initially containing one bud were cultured on the 24 treatments for 12 weeks with transfers onto fresh medium at 4 and 8 weeks. At each transfer and at the end of the experiment plants were scored for the number of shoots produced, number of new buds, fresh weight, and presence of roots. No difference was observed between the MS and ALA media. No interaction was found between medium and hormone concentration. BA inhibited the formation and growth of roots that were observed only in the control without BA. The control was different from 9, 18, and 36 μm BA for the number of buds produced, number of shoots and fresh weight while no differences were observed between the various concentrations of BA. ER292 gave the highest yields in number of buds, shoots and fresh weight of all the genotypes.

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Alessandro Chiari and Mark P. Bridgen

Meristems from three different positions were excised from in vitro plants of Alstroemeria genotype A30. Explants were removed from the most-distal vegetative shoot apical meristems, rhizome tip apical meristems, and rhizome tip axillary meristems. Meristems were cultured on four different media to compare the effect of meristem position and medium on the ability to produce Alstroemeria rhizomes from meristems. The meristem culture media were Murashige & Skoog salts plus 8.39 μM pantothenic acid, 1.19 μM thiamine, and 0.55 mm myo-inositol (MSM), MSM plus 8.88 μM of 6-benzylaminopurine (BA), MSM plus 8.88 μM BA, and 0.72 μM gibberellic acid (GA3), and MSM plus 0.72 μM GA3. Meristems that were removed from the vegetative shoot apices did not develop rhizomes on any medium. Rhizome tip apical meristems developed less than 10% rhizomes when subcultured on media containing BA and GA3. However, rhizome tip axillary meristems developed rhizomes on all media with best results achieved when the medium was supplemented with BA.

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Alessandro Chiari, George C. Elliott and Mark P. Bridgen

Seven resin-coated fertilizers (RCF) (Osmocote 19–6–12, 18–6–12, 14–14–14, 13–13–13, and 19–6–12, and Polyon 19–6–12, 17–17–17, and 13.5–13.5–13.5) were applied to marketable potted Alstroemeria hybrid FL101 plants to determine their effects on postproduction flowering and growth. The nonfertilized control produced the greatest number of floral stems, total florets, and mean number of florets per stem, but these plants were extremely chlorotic and spindly, and had the lowest fresh weight and number of vegetative stems. In a subsequent experiment, plants were fertilized with low, medium, and high concentrations of either Osmocote 19–6–12 or Sierra HighN 24–4–8. Nonfertilized controls were again chlorotic and spindly, but produced as many florets as fertilized plants. Plants fertilized with Osmocote 19–6–12 had greater fresh weight and more vegetative stems, but fewer total florets than those fertilized with Sierra HighN 24–4–8. We concluded that potted Alstroemeria do not need fertilizer for continued flowering, and fertilization favors production of vegetative stems relative to flowering stems. However, application of RCF to marketable plants prevents chlorosis, increases fresh weight, and, if low to moderate rates of formulations with N–P ratios of at least 6:1 are applied, does not inhibit flowering.