Enraizamento de microestacas de mirtileiro provenientes de microjardim clonal semi-hidropônico

Abstract

RESUMO -O uso de microjardins clonais hidropônicos tem sido relatado com sucesso para espécies florestais e pode vir a se tornar uma excelente alternativa para espécies frutíferas de difícil propagação, como é o caso do mirtilo. O objetivo deste estudo foi avaliar o enraizamento de microestacas de mirtileiro provenientes de dois sistemas de cultivo (convencional e semi-hidropônico), submetidas a diferentes concentrações de AIB (ácido indolbutírico). As microestacas de mirtileiro das cultivares Bluebelle e Woodard foram submetidas a diferentes concentrações de AIB (0; 500; 1.000; 1.500 e 2.000 mg.L -1 ), acondicionadas em caixas plásticas contendo vermiculita e, aos 90 dias de cultivo, avaliou-se o seu rendimento. O delineamento experimental foi o inteiramente casualizado, com vinte tratamentos, contendo quatro repetições, compostas por dez microestacas cada. Foram avaliados as porcentagem de sobrevivência e de enraizamento, o comprimento da maior raiz, o número de brotações, o comprimento médio das brotações, o número de folhas e as massas fresca e seca radiculares. O sistema semi-hidropônico proporcionou um rendimento de microestacas significativamente superior ao convencional; entretanto, este material apresentou menores porcentagens de sobrevivência e enraizamento. Todos os tratamentos, inclusive aquele sem a presença de AIB, apresentaram porcentagens de enraizamento superiores a 50%. Termos para indexação: propagação, microestaquia, Vaccinium spp. ROOTING OF BLUEBERRY MICROCUTTINGS ORIGINATED FROM SEMI-HIDROPONIC CLONAL MICROGARDENABSTRACT -The use of hydroponic clonal microgardens has been reported successfully to forest species and might become an excellent alternative for fruit species such as blueberry. The objective of this study was to evaluate the rooting of blueberry microcuttings originated from two cultivation systems (conventional and semi-hydroponic) subjected to different concentrations of IBA (indolbutyric acid). The microcuttings of Bluebelle and Woodard blueberry cultivars, from the two cultivation systems, were subjected to different concentrations of IBA (0, 500, 1000, 1500 e 2000 mg.L-1) and packed in plastic boxes containing vermiculite and 90 days after microcutting setting yield was evaluated. Completely randomized experimental design was used with twenty treatments and four replications, composed of ten microcuttings. Percentage of survival and rooting, length of the largest root, number of shoots, average length of shoots, leaf number, fresh mass and dry mass were evaluated. The semi-hydroponic system provided a microcuttings yield significantly superior to the conventional system, however, this material showed smaller percentage of survival and rooting. All treatments showed rooting percentage greater than 50%, even the treatment without the use of IBA at 2000 mg.L -1 .

Methods of application of indolebutyric acid and basal lesion on ‘Woodard’ blueberry cuttings in different seasons

“…The length of the longest root in cuttings collected in autumn is in agreement with those found by Yamamoto et al (2017), who observed from means from 3.5 cm to 7.1 cm. However, the means obtained in the summer were higher than that recorded by Nascimento et al (2011), 3.79 cm.…”

Production of ‘Arbequina’ olive tree seedlings under soilless growing systems

“…When testing blueberry (Vaccinium ashei) seedlings under the semi-hydroponic system, Nascimento et al (2011a), recorded the best results for aerial part height and number of shoots. These results can be visualized in the present work.…”

Minicutting of Chardonnay Grapevine and So4 Grapevine Rootstock

“…The use of minicuttings by maintaining one or two half leaves has already been studied and used for other species, such as guava (Psidium guajava L.) (ALTOÉ et al, 2011), blueberry (Vaccinium spp.) (NASCIMENTO et al, 2011;FISCHER et al, 2013), peach (Prunus persica) (TIMM et al, 2015), "ipê-roxo" (Handroanthus heptaphyllus Mattos) (OLIVEIRA et al, 2015), yerba mate (Ilex paraguariensis) (SÁ et al, 2018) and grapevine rootstocks (ROBERTO et al, 2006). The reduction in leaf size reduces water loss, therefore, facilitating the handling of the material (FISCHER et al, 2013), and enabling the storage of a greater number of minicuttings in a particular container or space intended for rooting.…”