Karyotypes of some species of Castanopsis, Lithocarpus and Quercus (Fagaceae) from Khun Mae Kuang Forest in Chiang Mai province, northern Thailand
2014
Chokchaichamnankit, Ploenpit | Chulalaksananukul, Warawut | Phengklai, Chamlong | Anamthawat-Jonsson, Kesara
Karyotypes of 18 species belonging to three genera, Castanopsis (9), Lithocarpus (5) and Quercus (4) of Fagaceae from northern Thailand were constructed. All species showed diploid (2n = 2x= 24) chromosome numbers, with the basic number being 12. Meiosis from anthers of two Castanopsis species confirmed the diploid status. Metaphase chromosomes are relatively small, about 2–5 ìm in size, and all are metacentric and submetacentric chromosomes. The arm-ratio measurement revealedkaryotypic variation among the species investigated – the chromosome complement consists of 8–12 pairs of metacentric and 0–4 pairs of submetacentric chromosomes. This is the first report of karyotypes of Castanopsis and Lithocarpus from Thailand. The karyotypic description of the Quercus speciesexamined here is substantially different from that of European species.
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