Karyotype Uniformity of Streptolirion volubile subsp. volubile (Commelinaceae) from China and Japan-文献传递-植物通论文库

作者：Hong De-Yuan

期刊：植物分类学报 1986年 4期

Abstract:

Four populations of the subspecies (one from Mêdog, southern Xizang

(Tibet), two from Lunnan, central Yunnan, and the other from Yanqing, Bei-

jing), are shown to have uniform karyotype (Plate I, Table 1, Fig. 1 and 2). Although

some differences in arm ratio appear among the four populations, the differences are

not stadistically significant as shown with 95% confidence limits (Table 1). The kar-

yotype shown here is extremely similar to the one reported by Suda and Fedan (1980).

But the subspecies was reported to have 2n=6 (Kammathy and Rao, 1964) and 2n=12

from northeastern India (Sharma and Sharma, 1958), with both chromosome number

and structure (2n=2M+8m(4SAT)+2st) strikingly different from those of Chinese and

Japanese materials (Suda and Fedan, 1980), and 2n=48 from Korea. As the localities

where our materials and Suda and Fedan‘s one came from cover almost the whole dis-

tribution area of the subspecies, from the western extreme to the eastern extreme, from

nearly southernmost part to northernmost part, the present author spaculate that the re-

ports from India and Korea may well be based on misidentified materials.

If karyotype formula is used to express the karyotypes of the materials used in

this work, they will be 2n=10=2sm+6st(2SAT)+2t (Mêdog, Xizang); 2n=10=2m+

8st (2SAT)and 2n=10=2sm+8st (2SAT)(Lunan, Yunnan), and 2n=10=2sm+6st

(2SAT)+2t (Yanqing, Beijing). As already stated above, however, the differences ex-

pressed by the formulae are false ones. Therefore, relative value of karyotype formula

should be seriously considered and special caution must be taken when it is used

Karyotype Uniformity of Streptolirion volubile subsp. volubile (Commelinaceae) from China and Japan