Winter-hardiness assessment in groundcovering roses by histochemistry

The paper presents the results of the seasonal dynamics of starch and lipids study in annual shoots of rose species and cultivars growing in the urbanized medium of a Siberian megapolis under continental climate conditions. The prospects of prediction the winter hardiness of roses by the rate of starch hydrolysis and lipids storage in pre-winter period are shown. During this period, starch is observed in medullary rays, perimedullary region and pith (centripetal tendency), while primary cortex, phloem and cambium are rich in lipids (centrifugal tendency).