Effect of paclobutrazol and Glomus intraradices on the crop of Lilium cv. Armandale and Tresor
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Abstract
Plant growth regulators have been used to improve the visual appearance of ornamentals, and the application of mycorrhizae to facilitate phosphorus absorption. In this research, the effect of three concentrations of paclobutrazol and an inoculum with spores of Glomus intraradices on the growth, flowering, and biomass distribution of Lilium 'Armandale' and 'Tresor' was evaluated, together with complete fertilization or with a deficient phosphorus nutrient solution. Forty-five bulbs of each cultivar were submerged in solutions with 0, 50 or 200 mg L-1 of paclobutrazol and planted in pots with 2.5 L of tezontle. Another treatment consisted on 15 bulbs sprinkled with 1 g of the inoculum of G. intraradices before planting. The results showed that Lilium 'Armandale' produced taller plants (59.13 cm) than 'Tresor' (47.80 cm). In both cultivars, paclobutrazol reduced plant height while irrigation did not affect this variable. The number of leaves (89), and diameter (17.90 mm) and flower of bud length (47.49 mm) were similar in both 'Armandale' and 'Tresor'. The number and fresh biomass of flower buds were 1.3 and 2.5 times higher in 'Tresor' than in 'Armandale', with flower stems visually more striking. Bulbs inoculation of G. intraradices with a phosphorus-deficient nutrient solution, increased the dry biomass of roots, but not of the stems and leaves, showing that the positive effect of G. intraradices only occurred at the fungus-plant interaction site.
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