J Syst Evol ›› 1998, Vol. 36 ›› Issue (1): 28-35.
• Research Articles •
WANG Yin-Zheng, GU Zhi-Jian, HONG De-Yuan
The karyotypes of the genus Whytockia was investigated in order to reveal its sys tematic position in the tribe Klugieae and the evolution of karyotypes within this genus. The
chromosome numbers are 2n＝18 with their length over 2.0 µm in all the investigated
species of Whytockia, which represents the most primitive characteristics in the tribe
Klugieae. This paper suggests that x＝9 be the primitive basic number of chromosomes in
the Klugieae. The morphology of the resting nuclei in Whytockia belongs to the complex
chromocenter type. The chromosomes at mitotic prophase are classified into the gradient
type. The evolution of karyotypes in Whytockia is toward increase of the chromosomes with
submedian centromeres and especially those with subterminal centromeres. The karyotype of
the variety W. tsiangiana (Hand.-Mazz.)A. Weber var. wilsonii A. Weber is distinctly
different from that of W. tsiangiana var. tsiangiana, which conforms well with the gross
morphology. This paper suggests that this variety be separated from W. tsiangiana as an independent species with affinity to W. bijieensis.
Whytockia W. W. Smith,
WANG Yin-Zheng, GU Zhi-Jian, HONG De-Yuan. Karyotypes of Whytockia (Gesneriaceae). J Syst Evol, 1998, 36 (1): 28-35.
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