Interação entre fungos micorrízicos arbusculares e ácido indolbutírico sobre o desenvolvimento vegetativo de plântulas do porta-enxerto de pessegueiro 'Aldrighi'

Abstract

RESUMOObjetivou-se, neste trabalho, avaliar o efeito da interação entre três espécies de fungos micorrízicos arbusculares (FMAs) (Gigaspora margarita W.N. Becker & I.R. Hall., Glomus clarum Nicol & Schenck e Glomus etunicatum Becker & Gerd) e a aplicação radicular de ácido indolbutírico (AIB; 1,5 g.L -1 ) sobre o crescimento vegetativo e nutrição mineral de mudas do porta-enxerto de pessegueiro (Prunus persica) cv. Aldrighi. Foi utilizado o delineamento experimental de blocos ao acaso, com oito tratamentos, quatro repetições por tratamento e dez plantas por parcela. A aplicação do AIB não alterou o desenvolvimento vegetativo das plantas cultivadas em ausência de FMAs, apesar de aumentar a quantidade de potássio nos tecidos. Glomus clarum e Glomus etunicatum incrementaram o crescimento vegetativo e o conteúdo de nitrogênio, fósforo e potássio dos tecidos das plantas. Plantas inoculadas com FMAs, ao serem tratadas com AIB, apresentaram incremento no desenvolvimento vegetativo e nos conteúdos nutricionais, comparativamente àquelas não tratadas com a auxina. Termos para indexação: AIB, Prunus persica, endomicorrizas, propagação. ABSTRACTThe objective of this work was to evaluate the effect of the interaction between three arbuscular mycorrhizal fungi (AMFs) species (Gigaspora margarita W.N. Becker & I.R. Hall., Glomus clarum Nicol & Schenck and Glomus etunicatum Becker & Gerd) and the rooting application of indolebutyric acid (IBA; 1,5 g.L -1 ) on the vegetative growth and shoot mineral nutrition on peach tree rootstock (Prunus Persica) seedlings cv. Aldrighi. Random block delineation was used, with eight treatments, four repetitions per treatment and ten plants per plot. The application of IBA didn't alter the vegetative development of the plants cultivated in absence of AMFs, in spite of having increased the amount of potassium. Glomus clarum and Glomus etunicatum increased the vegetative growth and the nitrogen, phosphorus and potassium shoot contents of the inoculated plants. Inoculated plants treated with IBA presented a increment in vegetative development and shoot nutritional contents compared to those cultivated in absence of IBA.

Production of peach grafts under hydroponic conditions

“…In comparison to this work, or, under conditions hydroponic, there was an anticipation in 53 days of the diameter of rootstock. Nunes et al (2010) studying the rootstock (Prunus persica) cultivar Aldrighi which all the material was kept in a mist house in plastic bags gusseted containing five liters of the substrate made up of clayey land coming from a typical dystrophic Red Podzol, sand (particle size between 0.6 and 1.0 mm) and decomposed black acacia residue (1:1:1, V:V.V), at that moment, the root system of the seedlings was immersed in a hydroalcoeolic solution hidroalcoeólica containing a concentration of 1.5 g L -1 of indolbutiric acid (AIB) for a 10 second period, it was found that the time for the rootstocks to reach the grafting point was of 360 days of growth. In comparison to the present work, that is, under hydroponic conditions, there was a anticipation of 276 days (Table 1).…”

Arbuscular mycorrhizal fungi and indolebutyric acid alter rooting rate and physiological characteristics of Lantana camara L. (Verbenaceae)?

“…The results showed that L. camara cuttings, when inoculated with mycorrhizal fungi in the presence of IBA, had a considerable increase in their biometric characteristics, although in some cases there was no difference in comparison to the control. Studies with Prumus persica and Citrange carriz showed that the association between AMF and IBA is responsible for a large increase in vegetative development, and when analyzed separately, they do not present good results, with IBA being ineffective when not associated (Souza et al 2000, Nunes et al 2010.…”

Tecnologia para produção de mudas de Copaifera langsdorffii Desf. por meio de miniestaquia seminal

“…Segundo Hartmann et al (1997) isso pode ser explicado, em parte, pelo fato de que as miniestacas poderiam estar em pleno desenvolvimento no qual o balanço hormonal interno se mostrava favorável ocorrendo, portanto, uma resposta negativa às aplicações do AIB. Entretanto, incremento nos conteúdos foliares de P e K em plantas de Citrange carrizo (Souza et al, 2000) e de macronutrientes (N, P, K, Ca e Mg) em pessegueiro (Nunes et al, 2010) foi notado com o aumento das concentrações da auxina (AIB).…”