Ferdor-julior, Myran-Yumir and St. Julien GF 655-2 rootstocks: propagation by cuttings with growth regulators and bottom heat
2004
Dessy, S. | Radice, S. | Andorno, A. | Ontivero, M.
The aim of this work was to evaluate several treatments performed with cuttings of three Prunus sp. rootstocks to improve adventitious rooting. Hardwood shoots of Ferdor-Julior (FJ), Myran-Yumir (MY) and St. Julien GF 655-2 (GF 655-2) rootstocks were collected in late autumn from plants growing in a mild winter climate. Cuttings were taken from proximal and median positions, wounded to the base and treated with 1% indole-3-butyric acid + 1% 1-phenyl-3-methyl-2-pyrazoline-5-one + 5% benomyl and 10% sugar cane (IBA + PPZ). The same mixture was tested without PPZ (IBA). Control treatment was 5% benomyl + 10% sugar (Control). Industrial talc was used as the carrier. After treatment, cuttings were kept wrapped and wetted in a cool place (10ºC - 15ºC) during 50 days. Then, they were placed in rooting beds with perlite medium; one half with bottom heat (21 ± 2ºC) and the other under greenhouse conditions. Two hundred and forty cuttings were used for each rootstock. Random distribution for treatments was used in beds. Responses were evaluated twice: 90 and 105 days after the beginning of the experiment. Percentage of surviving plants and root quantity and quality (length, thickness and weight) were recorded. GF 655-2 rootstock with growth regulators rooted quite readily. 100% cuttings showed roots 50 days after the beginning of the experiment. IBA and IBA +PPZ treatments improved rooting in FJ cuttings. Control cuttings did not show roots. Growth regulators promoted abundant calluses and a low number of root primordia on Myran-Yumir cuttings. IBA and IBA+PPZ treatments induced more than 80% death of cuttings. Nevertheless, survival in controls was more than 70%.
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