Karyomorphology of Three Species of Crinum L
1992 年 57 巻 3 号 p. 309-314
詳細
1992 年 57 巻 3 号 p. 309-314
Cytology of populations of three species of Crinum from South India is reported such as C. asiaticum, C. giganteum and C. moorei. All the species are diploids and x=11 basic, with C. asiaticum occurring here as triploid cytotype also. C. giganteum and C. moorei showed intraspecific aneuploidy, 2n=22 and 23 in the former and 2n=22, 21 and 20 in the latter.
Meiotic behaviour and karyomorphology of the triploid C. asiaticum is suggestive of its autrotriploid nature. Karyotypes of all the taxa are relatively asymmetrical and graded, C. asiaticum exhibiting more asymmetry (3 B) and C. giganteum the least (2 B).
The extent of chromosome numerical and structural difference noticed in the different populations of C. giganteum is pointed out to have some bearing on the plant morphological differences evident in the species complex. The disputed systematic treatment of the tribe Crineae is considered in the light of cytological data, and the evidence appears to favour Hutchinson's approach.
