Articles
PEACH ROOTSTOCK PROPAGATION UNDER INTERMITTENT MIST SYSTEM
Article number
1084_5
Pages
53 – 62
Language
English
Abstract
A large number of Prunus spp. genotypes have been studied as rootstocks for stone fruits but there is limited information about clonal propagation by softwood and semi-hardwood cuttings.
Two trials were carried out under a mist system with controlled temperature and air relative humidity.
Cuttings (12 cm long, 6-12 mm in diameter) with half-leaves on three top nodes were prepared and placed in bottom perforated, plastic boxes (53 x 26 x 6.5 cm) filled with course vermiculite.
The first trial was done with softwood cuttings (June-July, 2011) in a completely randomized 3×3×2 factorial design [rootstocks: Krymsk® 86, Lovell and Prunus Americana; indole-3-butiric acid (IBA) concentrations: 0, 3,000 and 6,000 ppm; and IBA sources: IBA and IBA-K salt]. Semi-hardwood cuttings (August-September, 2011) were used for the second trial, which was a completely randomized 3×3 factorial design (rootstocks: Guardian®, Krymsk® 86 and P. munsoniana; and IBA concentrations: 0, 3,000 and 6,000 ppm). There were significant differences among genotypes for all variables related to rooted cutting percentage, root quality, and new shoot formation, with the best results for Krymsk® 86. This genotype can be propagated by softwood or semi-hardwood cuttings even without IBA. Vegetative buds on softwood cuttings of Lovell and semi-hardwood cuttings of Guardian® (both P. persica) did not break while under mist system.
A unique effect of the IBA-K salt was to decrease root dry mass.
Softwood cuttings of Lovell or P. Americana and semi-hardwood cuttings of Guardian® should be treated with IBA at 3,000 ppm.
Two trials were carried out under a mist system with controlled temperature and air relative humidity.
Cuttings (12 cm long, 6-12 mm in diameter) with half-leaves on three top nodes were prepared and placed in bottom perforated, plastic boxes (53 x 26 x 6.5 cm) filled with course vermiculite.
The first trial was done with softwood cuttings (June-July, 2011) in a completely randomized 3×3×2 factorial design [rootstocks: Krymsk® 86, Lovell and Prunus Americana; indole-3-butiric acid (IBA) concentrations: 0, 3,000 and 6,000 ppm; and IBA sources: IBA and IBA-K salt]. Semi-hardwood cuttings (August-September, 2011) were used for the second trial, which was a completely randomized 3×3 factorial design (rootstocks: Guardian®, Krymsk® 86 and P. munsoniana; and IBA concentrations: 0, 3,000 and 6,000 ppm). There were significant differences among genotypes for all variables related to rooted cutting percentage, root quality, and new shoot formation, with the best results for Krymsk® 86. This genotype can be propagated by softwood or semi-hardwood cuttings even without IBA. Vegetative buds on softwood cuttings of Lovell and semi-hardwood cuttings of Guardian® (both P. persica) did not break while under mist system.
A unique effect of the IBA-K salt was to decrease root dry mass.
Softwood cuttings of Lovell or P. Americana and semi-hardwood cuttings of Guardian® should be treated with IBA at 3,000 ppm.
Publication
Authors
N.A. Mayer, G.L. Reighard, W. Bridges
Keywords
Prunus spp., softwood cutting, semi-hardwood cutting, IBA, IBA-K salt
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