Increased Rooting of 'Norton' Grape Cuttings Using Auxins and Gibberellin Biosynthesis Inhibitors
2003
Keeley, Kathryn | Preece, John E. | Taylor, Bradley H.
Hardwood and softwood cuttings of Vitis aestivalis Michx. 'Norton' were rooted under intermittent mist in a series of experiments using cuttings collected from two local vineyards. Hardwood cuttings treated in late March responded in a similar manner to KIBA and KNAA. Although there was little increase in the percentage rooting above 22.29 mm KIBA or 20.72 mm KNAA (5000 mg·L-1 of either auxin), root number (but not root length) increased linearly on cuttings treated with up to 44.58 mm KIBA or 41.44 mm KNAA (10000 mg·L-1 auxin). Cuttings treated with 10000 mg·L-1 auxin produced up to 4 times more roots than the nontreated controls. The gibberellin biosynthesis inhibitors CCC and PAC had little effect on either hardwood cuttings or softwood cuttings that were harvested, treated and placed in the propagation bench in June. However, when softwood cuttings were collected in August, the most roots were found on cuttings treated with 50.6 mm CCC or 0.85 μm PAC. Although all hardwood cuttings were collected at the same time and stored under refrigerated conditions, rooting percentage increased as storage time increased, especially on the nontreated control cuttings. When the cuttings were stored for the longest time (six weeks), KIBA no longer caused more roots per cutting. Chemical names used: potassium salt of indole-3-butyric acid (KIBA), potassium salt of α-naphthaleneacetic acid (KNAA), chlormequat chloride (CCC), paclobutrazol (PAC).
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