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ISHS Acta Horticulturae 1035: VI International Symposium on the Taxonomy of Cultivated Plants

KARYOTYPE AND FLOW CYTOMETRY ANALYSIS OF THE NATURAL POPULATIONS OF ROSA BEGGERIANA AND ROSA LAXA IN XINJIANG, CHINA

Authors:   S. Yang, Y.J. Han, S.H. Yang, H. Ge
Keywords:   karyotype, population, Rosa beggeriana, Rosa laxa, Xinjiang
DOI:   10.17660/ActaHortic.2014.1035.23
Abstract:
As the typical local rose species in Xinjiang, R. beggeriana and R. laxa are highly similar in the morphology except that the sepals are deciduous in R. beggeriana while they are persistent in R. laxa after hips ripening. Both species had been applied to interspecific hybridization with modern rose cultivars for the introgressions of stress-resistances. In this study, R. beggeriana from three populations and R. laxa from four populations varied with different altitudes had been selected for ploidy and karyotype analysis. The results showed that the populations of R. beggeriana and R. laxa are diploid and tetraploid respectively. The karyotypes of seven populations of two species are all identified as the small chromosomes types, which belong to original, symmetric and 2A types. Moreover, different karyotype diversity was found in the populations between R. beggeriana and R. laxa.

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