Cytotaxonomic Studies in the Family Amaranthaceae
1974 年 39 巻 1 号 p. 121-131
詳細
1974 年 39 巻 1 号 p. 121-131
Cytology of 23 taxa belonging to 9 genera of the family Amaranthaceae were studied. Of these, chromosome numbers for six taxa viz. Amaranthus hybridus L. var. frumentaceous Roxb., A. caturtus Heyne., Allmania nodjora Br. var. roxburghii Hook. f., Celosia pulchella Moq., Pupalia lappacea Moq. and Cyathula prostrata Bl. were recorded for the first time and different chromosome number has been recorded in each of the two species viz. Amaranthus giganteus Koenig. and Allmania nodiflora Br. against the previous reports.
All the reports of chromosome numbers by earlier workers were compiled along with our own. In the light of the cytological findings the taxonomic positions some members of the family were discussed.
The cytological analysis indicated that the genus Amaranthus L. was characterised by greater amount of homogeneity in its chromosome numbers than other genera of the family. Basing on Grant's (1969) view that the basic chromosome number of x=17 is a probable derivation from x=16, two lines of evolution from this basic number in the cytological level was visualised; one through euploidy resulting n=32 in few species and the other through aneuploidy resulting n=17 in larger number of species.
