There grow five chemotypes of Microlepia marginata in Japan. M-type strain containing microlepin and/or 4-epimicrolepin, a predominant strain, is found all over the habitat, and F-type strain containing a flavonoid, fumotonaringin, and M-F-type strain containing microlepins and fumotonaringin are in the south-west areas of Japan and never on the Japan sea side where snow is deep in winter. P-type strain containing fumotoshidin A and fumotoshidin arabinoside, and Y-type strain containing marginatosides A and B are rather rare but found in all the areas, though P-type strain is more common in the Hokuriku and San-in districts and Y-type strain in the Shikoku and the south-west of Kyusyu. Of M. marginata growing in Japan, 61% is of M- type, 13% of M-F-type, 9% of F-type, 4% of Y-type and 13% of P-type. As regards the chromosome numbers, all the chemotypes were shown to be tetraploid, with the chromosome number of 168. A rare example of hexaploid, with the chromosome number of 252, was found among the M-F-type plants, showing that the constituent variation is independent of the chromosome numbers. M. marginata var. bipinnata and M. pseudo-strigosa were also tested for their constituents. They were found to show TLC profiles similar to that of M-type strain and also indicated the presence of cyanogenic glycosides, the main constituents of M. strigosa, on Feigl-Anger test.
|Number of pages||8|
|Publication status||Published - 1 Jan 1998|
- Chromosome number
- Microlepia marginata
- Microlepia marginata var. bipinnata
- Microlepia pseudo-strigosa