Rooting of Tineke and Natal Briar rose stem cuttings in different substrates/Enraizamento de estacas de roseiras Tineke e Natal Briar em diferentes substratos

• Published in: Ciência rural Vol. 48; no. 8
• Main Authors: Ritter, Giovana, Hojo, Ellen Toews Doll, Villa, Fabiola, da Silva, Daniel Fernandes
• Format: Journal Article
• Language: English
• Published: Universidade Federal de Santa Maria 01-08-2018
• Subjects: Brasil
• ISSN: 0103-8478
• DOI: 10.1590/0103-8478cr20180117

The commercial propagation of rose bushes is carried out asexually by the cutting method. The genetic material and the substrate are factors that interfere in the rhizogenic process of the cuttings. Thus, the aim of this work was to evaluate the effect of the substrate on the rooting of cuttings of two hybrid rose bushes. Floriferous branches of matrix plants were cut at the apex and at the base, approximately 8cm long and with two buds, and the basal leaf was removed. The experimental design was completely randomized, in a 2 x 3 factorial scheme (two cultivars, Tineke and Natal Briar x three substrates, carbonized rice husk, coconut fiber and TN Gold[R]) containing four replicates of 15 cuttings per replicate. The base of the cuttings was immersed for five seconds in IBA 2000mg [L.sup.-1] solution (indole butyric acid). The cuttings were placed in trays with 24 cells previously filled with substrate and deposited on the floor in a transparent plastic tunnel, built inside a stove. After the 50-day experiment, rootstocks (%), sprouts (%) and dead (%), root length (cm), fresh and dry shoot biomass and roots (g) were evaluated. The rooting percentage of the Natal Briar cultivar was 75%, thus superior to the Tineke cultivar, which had a rooting percentage of 39%. The best substrates for the Tineke and Natal Briar rose cuttings are CAC and coconut fiber, which provided rooting percentages of 81% and 67% of the cuttings, respectively. Key words: Rose sp., asexual propagation, cutting, plant regulator. A propagacao comercial de roseiras e realizada assexuadamente, pelo metodo de estaquia. O material genetico e o substrato sao fatores que interferem no processo rizogenico das estacas. Diante do exposto, objetivou-se com o presente trabalho avaliar o efeito do substrato sobre o enraizamento de estacas de roseiras Tineke e Natal Briar. Foram utilizados ramos floriferos de plantas matrizes cortadas em bisel no apice e na base, com aproximadamente 8cm e duas gemas, sendo retirada a folha basal. O delineamento experimental utilizado foi inteiramente casualizado, em um fatorial 2 x 3 (duas cultivares, Tineke e Natal Briar x tres substratos, casca de arroz carbonizada, fibra de coco e TN Gold[R]), contendo quatro repeticoes de 15 estacas por repeticao. A base das estacas foi imersa por cinco segundos em solucao de 2000mg [L.sup.-1] de IBA (acido indol butirico). As estacas foram colocadas em bandejas com 24 celulas previamente preenchidas com substrato e depositadas no chao em tunel plastico transparente, construido dentro da estufa. Apos 50 dias de experimentacao avaliaram-se as estacas enraizadas (%), brotadas (%) e mortas (%), comprimento das raizes (cm), biomassa fresca e seca da parte aerea e raizes (g). A porcentagem de enraizamento da cultivar Natal Briar foi de 75%, superior a cultivar Tineke, que obteve 39% de estacas enraizadas. Melhores substratos para a estaquia de roseiras Tineke e Natal Briar sao a CAC e fibra de coco que proporcionaram o enraizamento de 81 e 67% das estacas respectivamente. Palavras-chave: Rosa sp., propagacao assexuada, estaquia, regulador vegetal.