engleski

Effect of Auxins on the Rooting of Cuttings in American Highbush Blueberry Vaccinium corymbosum L.

Auxins and their synthetic analogues are commonly used for the rooting of cuttings, but their efficiency depends on the experimental set-up and, even more importantly, on the species and the cultivar investigated. High bush blueberry (Vaccinium corymbosum L.) is reportedly difficult to root. Here we investigate the effect of indole-3-acetic acid (IAA), indole-3-butyric acid (IBA), and their amino acid conjugates on the rooting of softwood cuttings of the varieties Bluecrop, Jersey, Burlington and Bluetta. Two methods of auxin treatment were tested: a) short term treatment (ca. 5 seconds) with high concentrations (1000-10 000 ppm), and b) overnight treatment with concentrations in the range of 50-1000 ppm. The short term treatment a was more efficient. The rooting response depended on the blueberry variety and on the auxin used. Under optimal conditions, approximately 40% of the cuttings were rooted, six to eight weeks upon auxin treatment. In the varieties Jersey, Bluetta and Burlington, the roots were longer and more numerous than in Bluecrop. Treatment with auxin amino acid-conjugates afforded a particularly vigorous, well-branched root system.

auxin; rooting; cutting; american highbush blueberry; Vaccinium corymbosum L.

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