Cytological Observations on some W. Himalayan Monocots

We report results of karyotype analyses using nine species of Maianthemum from China. The species, except M. atropurpureum (with 2n=72), had 2n=36, and the results support the earlier suggestion that Maianthemum has x=18 with 2n=36 in most species. The species examined, however, showed marked differences in karyotype, particularly in the numbers of metacentric, submetacentric, and acrocentric chromosomes as well as in the number of satellites. In addition, we distinguished three different modes based on the number of clear gaps in chromosome length variation: unimodal, bimodal, and trimodal. The unimodal variation (with no gap) was found in M. dahuricum and M. atropurpureum, the bimodal variation (with one gap) in M. tatsienense, and the trimodal variation (with two gaps) in M. bifolium, M. forrestii, M. japonicum, M. henryi, M. purpureum, and M. lichiangense. In the trimodal variation, the positions of the two gaps may differ from species to species. In addition, the frequency of acrocentric chromosomes per complement was generally higher in the trimodal variation than in the unimodal and bimodal variations. Results of our analyses, which had not been clearly presented prior to this, may provide a better understanding of species evolution in the tribe Polygonatae.

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“…3, 18). The karyotype we reported here agrees with the one reported previously by Mehra and Sachdeva (1976).…”

Section: Maianthemum Purpureumsupporting

confidence: 93%

Karyomorphology of Maianthemum sensu lato (Polygonatae, Ruscaceae)

et al. 2005

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“…5L] The current chromosome count agrees with the previous report of 2n = 60 by Wulff (1937) from Schleswig-Holstein (Germany) and adds a new cytotype from India. Earlier, Mehra & Sachdeva (1976) reported 2n = 80 from the western Himalayas. The haploid chromosome number has been counted at metaphase I in pollen mother cells (Fig.…”

Section: Literature Citedmentioning

confidence: 93%

“…5C) and it represents a new chromosome number for this species. Earlier, it was reported to have 2n = 30 (Patwary & al., 1987) from Bangladesh, 2n = 90 (Kammathy & Rao, 1965;Mehra & Sachdeva, 1976) and 2n = 84 (Fotedar & Roy, 1969) from India. n = 30, CHN.…”

Section: Literature Citedmentioning

confidence: 99%

IAPT/IOPB chromosome data 18

Marhold¹

2014

TAXON

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“…pusillu from Australia with 2n = 28 and H. decumbens from South America with 2n = 42, both indicating a basic number of x = 7 which thus occurs pantropically. Mehra & Sachdeva (1976) have examined H. aurea from Himalaya which had 2n = 54 and a basic number of x = 6 was suggested.…”

Section: Introductionmentioning

confidence: 99%