Volume 70 Number 3 Article 1 Pages: 114-123
Year 2016 Month 7
Title: Cutting Type and Time-of-Year Affect Rooting Ability of Hardy Minnesota Prunus Species
Authors: Neil O. Anderson, Emily Hoover, Sarah A. Kostick, Emily Tepe, and John Tillman
Many species within the genus Prunus are difficult to root, and most cultivated accessions are grafted for
The University of Minnesota Prunus germplasm and cultivar releases include a variety
of ornamental and edible fruit types that have received little research focus.
Many accessions have never been
evaluated for the ability to root, even though at least one sour cherry, P. cerasus ‘Northstar’, is sold on its own
Two experiments were conducted to evaluate if cutting position, time of year, or auxin treatment
are important for terminal and basal softwood-semi-hardwood rooting success of: I) P. ×cistena (control); P.
armeniaca ‘Westcot’, and ‘Hardygold’; P. cerasus ‘Northstar’, and ‘Meteor’; P. domestica ‘Superior’, and P.
spp. ‘Alderman’ treated with 0.0041 M (1000 ppm) or 0.017 M (4000 ppm) indole-3-butryric acid-potassium
salt (K-IBA) and II) P. ×cistena (control) and P. spp. ‘Alderman’ treated with 0.00033 M (80 ppm) of K-IBA and
80 ppm Indole-3-caprioc acid (ICapA). Cuttings were taken biweekly (5 June-11 Sept.. 2012) and then monthly
until 4 Dec. 2012. After six weeks in the mist, cuttings were scored for callus formation, root development, and
bud break (leaves, flowering). The highest frequency of rooting occurred in June and again in Oct.-Dec. for P.
×cistena and July, Sept.-Oct. for P. armeniaca ‘Westcot’. All other cultivars had very low or no rooting.
regardless of genotypic variability, all Prunus analyzed had ≤60% rooting, which is less than commercially
The highest mean percent rooting ranged from 1.1% (P. spp. ‘Alderman’) to 24.1% (P. armeniaca
‘Westcot’) and 40.2% (P. ×cistena), although many had 100% rooting in specific cutting harvest weeks.
leaf and/or flowering of cuttings occurred as early as early June for ‘Westcot’, ‘Superior’, ‘Alderman’, and
P. ×cistena (Growing Degree Days (GDD) = 837) or late June for ‘Hardygold’, ‘Meteor’, and ‘North Star’ (GDD
=1070) was unprecedented.
The reasons for such a quick release from dormancy, often without the accumulation
of chilling units, are unknown.
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