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InfluĂȘncia da idade das estacas e de tratamento com auxina e ferida na estacaria do medronheiro.
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Abstract(s)
No inĂcio de junho de 2014, efetuou-se um ensaio de estacaria de medronheiro (Arbutus unedo L.) na estufa do viveiro florestal da Escola Superior AgrĂĄria de Castelo Branco (ESA/IPCB). Selecionou-se um medronheiro no Parque BotĂąnico da ESA/IPCB, de origem seminal (com cerca de 30 anos), com bom vigor vegetativo, onde foram recolhidas 150 estacas. Utilizaram-se, tambĂ©m, 150 estacas terminais provenientes de plantas jovens com um ano, provenientes de sementes de plantas de medronheiro do campus da ESA/IPCB. Pretendeu-se comparar a capacidade de enraizamento de estacas obtidas a partir de plantas jovens com estacas retiradas de uma planta adulta, sujeitas a diferentes tratamentos: a aplicação de diferentes concentraçÔes de ĂĄcido indolbutĂrico (AIB) (0, 2000, 5000 e 8000 ppm) apĂłs realização de uma ferida longitudinal na base da estaca.
Os parĂąmetros analisados foram a taxa de enraizamento e o nĂșmero de estacas com callus, mortas e vivas. Contou-se o nĂșmero de raĂzes (NR) e mediu-se o comprimento da maior raiz (CMR), em cada estaca enraizada. A recolha de dados teve lugar trĂȘs meses apĂłs o estabelecimento do ensaio. Nas estacas âjovensâ e adultas os tratamentos nĂŁo tiveram efeitos significativos nos diferentes parĂąmetros analisados, exceto no parĂąmetro formação de callus em estacas adultas e no NR e CMR das estacas jovens. Nas estacas provenientes de plantas jovens obtiveram-se valores entre 80% e 90% de enraizamento com a aplicação de AIB, valores nĂŁo significativamente diferentes dos tratamentos testemunha (73%) e sĂł ferida (80%). Nas estacas provenientes da planta adulta obteve-se 10% de enraizamento nos tratamentos com 2000 e 5000 ppm de AIB e no tratamento com 8000 apenas enraizaram 3% das estacas. Nos tratamentos testemunha e apenas ferida nĂŁo enraizou nenhuma estaca. Nas estacas jovens, os valores mais elevados para o NR e o CMR foram obtidos no tratamento de 8000 ppm de AIB, com 13,3 raĂzes e 9,6 cm, em mĂ©dia, respetivamente. Pudemos comprovar que esta espĂ©cie Ă© recalcitrante ao enraizamento no estado adulto, embora sĂł tenha sido testado um genĂłtipo e, em estado jovem, a aplicação de auxina (juntamente com a realização de ferida) aumenta a qualidade do enraizamento, mas nĂŁo a quantidade.
Abstract In early June 2014, a strawberry tree (Arbutus unedo L.) rooting trial was performed in the Escola Superior AgrĂĄria de Castelo Branco (ESA/IPCB) forest nursery greenhouse. An adult strawberry tree was selected at the ESA/IPCB Botanical Park of seminal origin (about 30 years-old), with good vegetative vigor, where 150 cuttings were collected. We used, also, 150 cuttings from one-year-old seedlings, from seeds collected in strawberry trees in the ESA/IPCB campus. We aimed at comparing the rooting ability obtained from the young plants with cuttings taken from the mature plant, subject to different treatment: the application of different concentrations of indole-butyric acid (IBA) (0, 2000, 5000 and 8000 ppm) after performing a longitudinal wound in the cutting base. The parameters analyzed were the rooting rate and the number of cuttings with callus, dead and alive. We counted the number of roots (NR) and measured length of the longest root (LLR), per each rooted cutting. The data collection took place three months after planting the cuttings. In the young and adult cuttings the treatments had no significant effects on the different analyzed parameters, except in the callus formation parameter of adult cuttings and in the young cuttings NR and LLR. Cuttings taken from young plants yielded 80% to 90% rooting with IBA application, values not significantly different from the control (73%) and with wound treatment alone (80%). Cuttings from the mature plant yielded 10% rooting in the treatments with 2000 and 5000 ppm of IBA and only 3% when 8000 ppm IBA was applied. We observed that the wound treatment alone no cutting rooted, in this type of material. In the young cuttings, the highest values for NR and the LLR were obtained in the 8000 ppm of IBA treatment, with 13.3 and 9.6 cm roots, on average, respectively. We confirmed that this species is recalcitrant to rooting in adulthood, although it has only been tested one genotype, and in youthful stage, the application of auxin (along with a wound) increases the quality of rooting, but not the quantity.
Abstract In early June 2014, a strawberry tree (Arbutus unedo L.) rooting trial was performed in the Escola Superior AgrĂĄria de Castelo Branco (ESA/IPCB) forest nursery greenhouse. An adult strawberry tree was selected at the ESA/IPCB Botanical Park of seminal origin (about 30 years-old), with good vegetative vigor, where 150 cuttings were collected. We used, also, 150 cuttings from one-year-old seedlings, from seeds collected in strawberry trees in the ESA/IPCB campus. We aimed at comparing the rooting ability obtained from the young plants with cuttings taken from the mature plant, subject to different treatment: the application of different concentrations of indole-butyric acid (IBA) (0, 2000, 5000 and 8000 ppm) after performing a longitudinal wound in the cutting base. The parameters analyzed were the rooting rate and the number of cuttings with callus, dead and alive. We counted the number of roots (NR) and measured length of the longest root (LLR), per each rooted cutting. The data collection took place three months after planting the cuttings. In the young and adult cuttings the treatments had no significant effects on the different analyzed parameters, except in the callus formation parameter of adult cuttings and in the young cuttings NR and LLR. Cuttings taken from young plants yielded 80% to 90% rooting with IBA application, values not significantly different from the control (73%) and with wound treatment alone (80%). Cuttings from the mature plant yielded 10% rooting in the treatments with 2000 and 5000 ppm of IBA and only 3% when 8000 ppm IBA was applied. We observed that the wound treatment alone no cutting rooted, in this type of material. In the young cuttings, the highest values for NR and the LLR were obtained in the 8000 ppm of IBA treatment, with 13.3 and 9.6 cm roots, on average, respectively. We confirmed that this species is recalcitrant to rooting in adulthood, although it has only been tested one genotype, and in youthful stage, the application of auxin (along with a wound) increases the quality of rooting, but not the quantity.
Description
Keywords
Ăcido indolbutĂrico Arbutus unedo L. Ferida Medronheiro Propagação vegetativa Indole-butyric acid Strawberry tree Vegetative propagation Wounding
Citation
ANTUNES, A. ; FERREIRA, C.C.A. ; RIBEIRO, M.M.A. (2014) - InfluĂȘncia da idade das estacas e de tratamento com auxina e ferida na estacaria do medronheiro. Agroforum : Revista da Escola Superior AgrĂĄria de Castelo Branco. ISSN 0872-2617. Ano 22:33, p. 41-49.
Publisher
Instituto Politécnico de Castelo Branco, Escola Superior Agråria