Journal
CARYOLOGIA
Volume 64, Issue 3, Pages 320-324Publisher
UNIV FLORENCE BOTANY INST
DOI: 10.1080/00087114.2011.10589798
Keywords
B chromosomes; karyotype; Rheum tanguticum Maxim. ex Balf.
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Funding
- West Light Foundation of the Chinese Academy of Sciences
- Natural Science Foundation of Qinghai Province of China [2011-Z-921Q]
- National key Technology R&D Program of China [2012 BAC08B04]
- knowledge Innovation Engineering of the Chinese Academy of Sciences
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A cytogenetic study was conducted on Rheum tanguticum populations from Huangnan Tibetan Autonomous Prefecture, China. The results revealed the chromosome numbers 2n=22 and the karyotype formulae are 2n=22=22m or 2n=22=2sm+20m, belonging to Stebbins 1A type. However, it was interesting to observe metaphases with variable B chromosomes (1, 2, 3, 4, 6, 7) in a few specimens. For the first time, the occurrence of B chromosomes was reported in natural populations of R. tanguticum. The number of B chromosomes in R. tanguticum varied not only among individuals but also within the same root tip.
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