Influência de folhas e lesões na base de estacas herbáceas no enraizamento de goiabeira da seleção 8501-9

Abstract

ResumoCom o objetivo de avaliar o potencial de enraizamento da seleção 8501-9 de goiabeira utilizou-se estacas herbáceas com 10-12 cm de comprimento em duas formas de preparo (corte simples sem lesão e exposição do câmbio) e três intensidades de supressão das folhas (sem folhas, com folhas cortadas ao meio e folhas intactas). O delineamento experimental foi inteiramente casualizado com cinco repetições em arranjo fatorial 2 x 3, com dez estacas por parcela. Após tratamento com AIB as estacas foram colocadas para enraizamento em caixas plásticas (44 x 30 x 7 cm) contendo casca de arroz carbonizada, em câmara de nebulização. Após 78 dias avaliou-se a retenção foliar, a sobrevivência das estacas, o número de estacas enraizadas e de raízes, o comprimento e as massas fresca e seca das raízes. A interação entre lesão e presença de folhas não foi significativa, indicando que estes fatores agem de forma independente em relação aos fatores estudados. A supressão das folhas resultou em morte das estacas. A exposição do câmbio não proporcionou vantagens no enraizamento de estacas herbáceas. As estacas com um par de folhas inteiras apresentaram maiores massas fresca e seca de raízes em relação às estacas com folhas cortadas, já as estacas sem folhas não apresentaram formação de raízes, sendo a presença de folhas fundamental para a promoção do enraizamento. Palavras-chave: Psidium guajava L, reguladores vegetais, propagação vegetal AbstractWith the objective of evaluate the potential of rooting of the selection of guava tree 8501-9 were using herbaceous cutting with 10-12 cm of length in two make of the prepared (simple cut without lesions and cambium exposition), and three suppression intensity of the leaves (without leaves, with half leaves and intact leaves). The experimental design was completely randomized with five repetitions in factorial arrangement 2 x 3, with ten cutting for parcel. After the preparation with IBA the cutting had been placed to rooting in plastic box (44 x 30 x 7 cm) with carbonized rice hulls, in camera of nebulization. After 78 days, evaluated the leaf retention, survive of the cutting, the number of cutting roots and of roots, the length and fresh and dry mass of the roots. The interaction between lesions and presence of leaves was not significant, indicating like this factors act in independent form in relation the study factors. The leaves suppression resulted in cutting death. The cambium exposition not proportion vantage on root cutting herbaceous. For the gotten results it was observed that the interaction between lesion and leaf presence was not significant, indicating that these factors act of independent form in relation to the evaluated parameters. Cutting with base lesion presented addition of only 10% of foliar retention and percentage of roots cutting. Cutting with a pair of leaves had been superior to the parameters of the mass fresh and dry of root in relation to the cutting with half leaves, and the cutting without leaves not presented formation of roots being presence of leaves fu...

Influência de ácido indolbutírico no enraizamento de estacas semilenhosas de Campomanesia aurea

“…This was also observed for "jabuticaba" (SASSO et al, 2010), guava (SANTORO et al, 2010) and pineapple guava (FRANZON et al, 2004).…”

“…However, when considering only the influence of presence of leaves, it was found that the conservation of leaves is essential to the survival of the cuttings. However, the conservation of a pair of full or cut in half leaves did not differ regarding the percentage of rooted cuttings, number of roots, length and survival of cuttings, differing only in root fresh and dry matter, which was higher in cuttings with full leaves (SANTORO et al, 2010). Similar results were observed in this study, where the presence of leaves was effective to the survival and rooting of cuttings, showing a negative correlation (-0.71) between leaf retention and cutting mortality (Figure 2).…”

“…There may also be the formation of adventitious roots from different tissues in the same cutting (HARTMANN, 2002;XAVIER et al, 2013). The quality of the root system is directly related to the survival of cutting when planted in the field due to a greater ability to absorb water and nutrients (SANTORO et al, 2010). For C. aurea, the characteristics of the root system (dry matter and root volume) were not changed by the different concentrations of IBA used.…”

Stem cuttings and substrates in Dovyalis asexual propagation

“…It is possible to verify a higher root biomass, variable that demonstrates the vigor of the roots (Paulus et al, 2014) The superior results for shoot/sprout diameter in cuttings with only two leaves can be explained by the stimulus that is given to the cutting for the production of photosynthetically active structures after the leaves removal (Santoro et al, 2010).…”

Produção De Mudas De Pingo-De-Ouro Sob Diferentes Tamanhos De Estacas E Quantidades De Folhas

“…No entanto, estas variáveis apresentaram valores inferiores para as estacas com ausência de folhas, sendo 90% menores em relação à matéria fresca e comprimento de raízes. SANTORO et al (2010) observaram que a presença de folhas inteiras promove maior massa fresca e seca das raízes das estacas, sendo fundamentais para a promoção do enraizamento em goiabeira. LIMA et al (2006), estudando tamanhos de estacas verificaram que estacas de 10 cm de comprimento retiradas da porção mediana dos ramos são apropriadas para a produção de mudas de aceroleira por estaquia, em condições de casa de vegetação com nebulização intermitente.…”