Association of Indolebutyric Acid with Azospirillum brasilense in the Rooting of Herbaceous Blueberry Cuttings
Renata Koyama | Walter Aparecido Ribeiro Júnior | Douglas Mariani Zeffa | Ricardo Tadeu Faria | Henrique Mitsuharu Saito | Leandro Simões Azeredo Gonçalves | Sergio Ruffo Roberto
Association between auxins and plant growth-promoting bacteria can stimulate root growth and development of fruit crop nursery plants, and can be a promising biological alternative to increase the rooting of cuttings. The objective of this study was to assess the viability of producing &lsquo:Powderblue&rsquo: blueberry nursery plants from cuttings using different doses of indolebutyric acid (IBA) in association with Azospirillum brasilense. The following treatments were tested: 0 (control): 500 mg L&minus:1 of IBA: 1000 mg L&minus:1 of IBA: A. brasilense: 500 mg L&minus:1 of IBA + A. brasilense: and 1000 mg L&minus:1 of IBA + A. brasilense. The experimental design was completely randomized, with six treatments and four replicates, and each plot (box) consisted of 10 cuttings. The boxes were arranged in a mist chamber with an intermittent regimen controlled by a timer and solenoid valve. After 90 days, the following variables were assessed: rooted cuttings: survival of cuttings: foliar retention: sprouting: cuttings with callus: root dry mass per cutting: number of roots per cutting: and root length. It was observed that the application of IBA with the A. brasilense rhizobacteria increased the number of roots of &lsquo:Powderblue&rsquo: blueberry cuttings, while the treatments with IBA alone and IBA 1000 mg L&minus:1 + A. brasilense increased the root length of cuttings. However, treatments with IBA and A. brasilense had no impact on % rooted cuttings and % survival of cuttings.
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