Abstract
The research was aimed at studying the possibility of an alternative method of propagation the difficult-to-root Rosa gallica ‘Tuscany Superb’. The root cuttings of three thickness were rooted using IBA preparations (Chryzotop green, Rhizopon AA 020XX) and biostimulants (Tytanit, Root JuiceTM). The shoots disappeared before the growth of the roots. At the first days of growth, the both shoots and roots elongated upright without polarity. The primordia of the first type of root/shoot buds were situated in cambium zone as the subtending traces of near the rays visible on the cross sections. Moreover, the second types of buds were located in pericycle tissues. The swellings suggested inherence buds were disappearing before rooting. The content of reducing and non-reducing carbohydrates was lower at the time of harvesting the rooted cuttings than before rooting. The thickness of the root cuttings had a significant importance for growth parameters and content of carbohydrates in rooted cuttings. The most useful root cuttings, those achieving the highest mean rooting percentage are thick (76.8%) and medium (67.9%) size. Preparations or biostimulants had a differential influence on rooting process and none of them unequivocally guaranteed an improvement in the rooting percentage of cuttings, parameters of growth or content of carbohydrates. The Rhizopon AA 020XX (90.0%) in thick and Chryzotop green (87.5%) in medium cuttings increased the rooting percentage significantly. Root JuiceTM (0.1%, 0.2%) and Tytanit (0.04%) were also enough positive activity in medium cuttings and can replace IBA preparations.
 
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 In press - Online First. Article has been peer reviewed, accepted for publication and published online without pagination. It will receive pagination when the issue will be ready for publishing as a complete number (Volume 47, Issue 3, 2019). The article is searchable and citable by Digital Object Identifier (DOI). DOI link will become active after the article will be included in the complete issue.
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