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- W2411863205 abstract "Wild Rosa species, which are highly variable and locally adapted, are widely distributed in the Xinjiang Uygur autonomous region of China. These species possess many important horticultural traits that are not found in the gene pool of modern cultivated roses. However, little is known about their cytological characteristics, because few of them have been karyologically analyzed. Karyological data of 13 samples of seven wild Rosa taxa, including R. berberifolia , two botanical varieties of R. spinosissima , R. platyacantha , R. beggeriana , R. acicularis , and R. laxa , were investigated by means of squashes of shoot tips. The results showed that seven samples were diploid (2 n = 2 x = 14), whereas the other six samples were tetraploid (2 n = 4 x = 28). The karyotypes of all the test samples were composed of m and sm chromosomes, which include 1A, 2A, 1B, and 2B. There were differences in asymmetry index, centromere index, and distribution of relative lengths. The karyotype of the tetraploid R. laxa var. laxa sample from Aksu easily distinguished from the other R. laxa var. laxa samples tested in having the highest asymmetry index and the most evolved karyotype. This Aksu population merits recognition as a new botanical variety of R. laxa . The karyological data, most of which are first reports for their taxa, provide a comprehensive cytogenetic resource that can be used to better understand the taxonomy, evolution, and speciation in the genus Rosa and to identify candidate species for breeding programs." @default.
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- W2411863205 date "2014-01-01" @default.
- W2411863205 modified "2023-10-10" @default.
- W2411863205 title "Karyotype Analysis of Wild Rosa Species in Xinjiang, Northwestern China" @default.
- W2411863205 doi "https://doi.org/10.21273/jashs.139.1.39" @default.
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