Interação entre o Genótipo e AIB no Enraizamento de Estacas Semilenhosas de Portaenxertos de Pessegueiro

Abstract

RESUMO: O objetivo deste trabalho foi estudar o efeito do genótipo e da aplicação de ácido indol butírico (AIB) no enraizamento de estacas semilenhosas de portaenxertos de pessegueiro. O trabalho dividiu-se em Experimento 1, onde avaliou-se as cultivares Capdeboscq e Nemaguard com quatro concentrações de AIB (0; 1.000; 2.000 e 3.000 mg L -1 ), onde obteve-se uma resposta quadrática com aproximadamente 50% de enraizamento no valor estimado de 2.500 mg L -1 de AIB, e um efeito linear crescente para o número de raízes com o aumento das concentrações de AIB, sendo 'Nemaguard' mais responsiva do que 'Capdeboscq'. No Experimento 2 avaliou-se 'Flordaguard', 'Hansen 2168', 'Kutoh' e 'Nagano Wild' e duas concentrações de AIB (0 e 2.000 mg L -1 ), verificando-se que o AIB possibilitou obter maiores taxas de enraizamento, número de raízes e comprimento de raízes nas quatro cultivares, em relação ao controle. 'Hansen 2168' apresentou a maior porcentagem de enraizamento (72,5%). 'Floradaguard' e 'Hansen 2168' apresentaram maior número de raízes por estaca (9,9 e 8,5, respectivamente), e 'Nagano Wild' apresentou o menor número e comprimento de raízes por estacas (4,8 e 3,3cm, respectivamente). Concluiu-se existir interação sinérgica entre os fatores avaliados, porém o uso de AIB é indispensável para obter satisfatórias porcentagens de enraizamento. Palavras-chave: Prunus persica, propagação vegetativa, estaquia, auxina, raízes adventícias. ABSTRACT:The aim of this work was to study the effects of genotype and the indolbutyric acid (IBA) on the rooting of semi hardwood cuttings of peach rootstocks. This work was divided into Experiment 1, in which the 'Capdeboscq' and 'Nemaguard' cultivars was treated with four IBA concentrations (0; 1,000; 2,000 and 3,000 mg L -1 ), and a quadratic behavior was observed with near 50% of rooting in the estimated concentration of 2,500 mg L -1 IBA, and a linear increase in the roots numbers occurred with increasing in IBA concentration, where 'Nemaguard' was more responsive than 'Capdeboscq'. In the Experiment 2, the 'Flordaguard', 'Hansen 2168', 'Kutoh', and 'Nagano Wild' were treated with two IBA concentrations (0 and 2,000 mg L -1 ) and the IBA treatment allowed to obtain higher rates of rooting, number of roots and root length in the four cultivars comparing to the control. 'Hansen 2168' showed the highest rooting percentage (72.5%). 'Floradaguard' and 'Hansen 2168' showed higher number of roots per cutting (9.9 and 8.5, respectively), and 'Nagano Wild' had the lowest number and length of roots per cutting (4.8 and 3.3 cm, respectively). It was concluded that exists synergistic interaction between the factors evaluated, but the IBA usage is essential for satisfactory rooting rates.

Advances in Peach, Nectarine and Plum Propagation

“…Due to all these factors, the results have been quite variable; however, it is possible to obtain rooting percentages higher than 70% with herbaceous, semi-hardwood or woody cuttings of scion peach tree cultivars (DUTRA et al, 2002;MINDÊLLO NETO et al, 2008), scion plum trees (MINDÊLLO NETO et al, 2006), of P. persica rootstocks (NACHTIGAL, 1999;TOFANELLI et al, 2005) and rootstocks of other species or interspecific hybrids of Prunus spp. (MAYER et al, 2001;MAYER et al, 2013;RADMANN et al, 2014a;MAYER et al, 2015). As a general rule, it is recommended that adequate fertilization (especially nitrogen) in the mother trees, drastic winter pruning in these plants to obtain vigorous new shoots, rapid immersion of the cutting base in indolbutiric acid solution (between 1,000 and 4,000 mg L -1 ), the availability of intermittent mist system, the use of containers and substrates that allow good drainage during rooting, are indispensable conditions for the success of the adventitious rooting of herbaceous cuttings, being this type of cutting that allows the best results in Prunus spp.…”

Optimization of germination and initial quality of seedlings of Prunus persica tree rootstocks

“…However, Schmitz et al (2014), studying rootstocks 'Okinawa' and 'Capdeboscq' obtained a mean height of 12.72 and 15.30 cm, respectively at 58 DAS. In our study, the height of seedlings from 'Capdeboscq' was of 15.0 cm at 22 DAS (Figure 1), therefore, the method of seedling production utilized here was effective to promote fast growth in a period that was 36 day earlier and to allow high quality of the seedlings.…”

Genetic selection of fig tree (Ficus carica L.) varieties using phenotypic characteristics of rooting and development of softwood cutting

“…Regarding to cutting survival rate, the mean percentage was 56%. This is lower than the reference value of 70 % for a satisfactory vegetative propagation (Chagas et al, 2008;Cardoso et al, 2011;Radmann et al, 2014). However, varieties 27, 42 and 'Roxo de Valinhos IS' were the cultivars with best performance (Figure 1).…”