Differences in phenolic makeup of indigenous rose species and modern cultivars

Differences in phenolic makeup of indigenous rose species and modern cultivars
Rosa canina was one of the indigenous roses in a study of leaf and petal phenolic profiles. Differences were found in the makeup of modern rose varieties and indigenous species. Credit: Valentina Schmitzer

The leaves and petals of roses are valued for their medicinal and aesthetic uses around the world. A new study identified specific phenolic compounds found in the petals of indigenous rose species and compared them with the phenolic profiles of modern rose cultivars to determine differences in the makeup of roses traditionally used for medicinal purposes and those varieties cherished for aesthetic qualities. According to the results, distinct differences exist in the distribution of leaf phenolic compounds, especially between indigenous rose species and modern rose cultivars.

Vlasta Cunja, corresponding author of the study published in the Journal of the American Society for Horticultural Science, said that previous research has linked phenolic and mineral composition of rose hips to their antioxidant activity. Phenolic antioxidants have also been identified in the petals of several rose species, but research on rose leaf polyphenols has been rare. Using high-performance liquid chromatography/mass spectrometry, Cunja and colleagues determined leaf and petal phenolic profiles of four indigenous rose (Rosa) species (R. canina, R. glauca, R. rubiginosa, R. sempervirens) traditionally used for medicinal purposes and three modern rose cultivars (Rosarium Uetersen, Ulrich Brunner Fils, Schwanensee).

The researchers identified seven different anthocyanins—the principal pigments responsible for intense red to mauve colors—in the rose petals. They found a "strong correlation" between color parameters and total anthocyanin content in petals. Additionally, 31 flavonols were detected in the rose petals; flavonol content varied significantly among species and cultivars analyzed. The analyses tentatively identified 30 different flavonols in the leaves of different rose species and cultivars.

"Our analyses revealed significant variations in the content and composition of phenolic compounds among species, cultivars, and plant and leaves," Cunja said. Interestingly, distinct differences in the distribution of leaf were found between and modern rose cultivars. Among the species investigated, leaves of Rosa canina stood out for their high and varied phenolic content. "The traditional practice of using Rosa canina for medicinal purposes appears scientifically justified because (the species) contains significantly more phenolic antioxidants compared with other naturally occurring species of the region," Cunja said.

The modern cultivar 'Schwanensee' was determined to be most dissimilar of all cultivars analyzed as a result of the low levels of phenolic constituents found in the leaves. The authors said this could potentially be linked to the cultivar's susceptibility to diseases. They concluded that are likely more suitable than as a potential source of leaf phenols with antioxidative activity.


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More information: The complete study and abstract are available on the ASHS J. Amer. Soc. Hort. Sci. electronic journal web site: journal.ashspublications.org/c … t/139/2/157.abstract
Citation: Differences in phenolic makeup of indigenous rose species and modern cultivars (2014, May 27) retrieved 23 July 2019 from https://phys.org/news/2014-05-differences-phenolic-makeup-indigenous-rose.html
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