Karyological diversity of wild Rosa in Yunnan, southwestern China

Autor: Ting Zhang, Hong Ying Jian, Qi Gang Wang, Shu Bin Li, Hao Zhang, Kai Xue Tang
Rok vydání: 2012
Předmět:
Zdroj: Genetic Resources and Crop Evolution. 60:115-127
ISSN: 1573-5109
0925-9864
DOI: 10.1007/s10722-012-9820-z
Popis: Wild Rosa resources in Yunnan are very abundant and hold many important and useful traits for improving modern rose. However, many of them have no cytological data and few were karyologically analysed. In this article, karyological study of 24 wild Rosa taxa belonging to different sections was carried out by means of traditional squashing and pressing. The chromosome number of 8 taxa and karyotypes of most studied ones were reported for the first time. 22 resources were diploids with 14 chromosomes (2n = 2x = 14), while Rosa moyesii Hemsl. et Wils. and Rosa macrophylla Lindl. from Sect. Cinnamomeae DC. were hexaploids with 42 chromosomes (2n = 6x = 42). Only type 1A and type 2A been found, karyotypes of genus Rosa in Yunnan were symmetric. Also, the studied taxa differed much from each other in chromosome length, position of centromere, satellite position and satellite number, etc. The results implied that wild Rosa germplasm in Yunnan were rich in karyologcal diversity, and polyploidization might have played and were still playing very important roles in the evolution and speciation in genus Rosa, mainly in Sect. Cinnamomeae in alpine areas of northwestern Yunnan. The cytological data would supply chromosomal proofs not only for the taxonomy, phylogeny and evolution of genus Rosa in this special geological area, but also for the exploitation of useful traits of wild Rosa into the breeding of new cultivars.
Databáze: OpenAIRE
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