Ecological and biological features of Rosa glauca Pourr., Rosa canina L., Rosa majalis Herrm. in using as rootstocks of garden roses in the forest-steppe of Western Siberia

The paper presents the results of a comprehensive comparative study of Rosa glauca Pourr and Rosa canina L. – rose hips used as rootstocks of garden roses – in a continental climate. A representative of the local flora Rosa majalis Herrm served as a model object for studying seasonal rhythmics, winter hardiness, as well as histochemical features. Based on studies of the objects ecological morphology, the nature of damage to aboveground shoot systems during wintering is described, the determining role of the minimum air temperature in assessing the adaptive potential of plants is noted. Differences in the seasonal dynamics of starch in the tissues of shoots of three species are most characteristic in the pre-winter period: as for R. glauca, the average amount of starch is observed in the perimedular zone while the low one is in single-row core rays. As for R. canina, a low amount of starch is observed in the perimedular zone and in single cells of single-row core rays. As for a representative of the local flora of R. majalis, almost complete starch hydrolysis occurs; it was recorded only in single cells of the perimedular zone. The paper also contains the results of joint research with the Nikitsky Botanical Garden, including X-ray examination of seeds and expedition studies to increase the collection gene pool of wild rose rootstocks.