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Propagacao vegetativa de sobreiros seleccionados

By Maria Isabel Carrasquinho de Freitas Roldao


The aim was to study the vegetative propagation techniques in the cork oak breeding program. Bud grafting and cuttings were used to multiply and mass propagate selected cork oak trees. Forty-six plus trees were bud grafted along two seasons (June/July and September) during four years. September was identified as the best season for grafting with a success of 52,3%. Twenty-two of these trees are represented in the Cork Oak Clonal Bank (Montemor-o-Novo). Rooting season and the temperature of the rooting substrate were demonstrated to be important factors in juvenile cuttings response. The highest rate ability was achieved in August with a rooting substrate temperature of 28 deg C (57,0%). The trials established in 1992 and 1993, using material taken from the clonal bank, confirmed the importance of the season in rooting rate. The best rooting rate was obtained by maintaining cuttings in rooting media for four months. The application of IBA influenced rooting ability both in cuttings from seedlings and those from the clonal bank. Nevertheless, juvenile material needed a lower IBA concentration (0,5%) than the old material (1%). The clone and age of grafting was shown to influence the rooting ability. The decrease of rooting ability with age of grafting requires a dynamic management of the clonal bank. Peroxidase activity and iso peroxidase patterns were studied during root formation in cuttings. Three ionically-bound neutral iso peroxidases were identified and associated with either root-induction phase or the wounding process. An ionically - bound basic iso peroxidase appeared at more advanced stages of development. This peroxidase was also predominant in extracts of basal segments of cuttings and roots from seedlings. The vegetative propagation of adult selected cork oak trees seems to be an adequate technique, establishing a prior clonal bank, by means of grating, and then mass propagating by cuttings this materialAvailable from Fundacao para a Ciencia e a Tecnologia, Servico de Informacao e Documentacao, Av. D. Carlos I, 126, 1249-074 Lisboa, Portugal / FCT - Fundação para o Ciência e a TecnologiaSIGLEPTPortuga

Year: 2000
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Provided by: OpenGrey Repository
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