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Levels of endogenous auxins and gibberellins in rhododendron stalk cutting related to rhizogenesis



Levels of endogenous auxins and gibberellins in rhododendron stalk cutting related to rhizogenesis



Acta Universitatis Agriculturae Facultas Agronomica 27(3-4): 35-40



The contents of endogenous gibberellins and auxins were observed in basal parts of cuttings obtained from a set of 7 rhododendron varieties characterized by different rooting capacities. The analyses were made in excellent-rooting 'Jacksonii' and 'Mad Mason' varieties, further in good-rooting 'Catawbiense', intermediate-rooting 'Allah', 'Blue Peter' and 'Roseum elegans' varieties, and finally in poor-rooting 'Peter' variety. The results suggested that, with expansion of the rhizogenesis in the cuttings, there was a trend toward decreasing the level of endogenous gibberellins in individual varieties and another, simultaneously occurring tendency toward increasing endogenous auxins. The poor-rooting 'Peter' variety had the lowest auxin level and a relatively high gibberellin level; the typical excellent-rooting 'Jacksonii' had a relatively low level of gibberellins, while the auxin level was highest. The only exception to this trend was observed with 'Mad Mason'.

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Accession: 005806026

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