New detection of haploid chromosomes, pollen size and sterility in Lychnis indica Benth. var. fimbriata Wall.
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概要
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<I>Lychnis indica</I> Benth. a member of the family Caryophyllaceae is commonly distributed in the temperate regions of the Himalayas. Two varieties- var. <I>indica</I> and var. <I>fimbriata</I> are recognized by Hooker in Indian taxa. Presently two accessions of var. <I>fimbriata</I> have been studied meiotically from Dalhousie Hills, Himachal Pradesh, India. Both the accessions uniformly exist at tetraploid level based on x=12 which is confirmed from the presence of 24 bivalents at metaphase I. The present chromosome count of n=24 is the first ever record for var. <I>fimbriata</I>. However, the same tetraploid chromosome number has been reported in the species from Kashmir Himalayas. In majority of the PMCs (pollen mother cells), the meiotic course is regular resulting into normal tetrad formation. However, some PMCs depict the phenomenon of cytomixis involving inter PMC transfer of chromatin material and associated meiotic anomalies. Chromatin transfer resulted into the formation of hypo- and hyper-ploid PMCs. Such PMCs results into the formation of pollen grains of heterogeneous sizes and some pollen sterility.
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国際染色体植物学会 | 論文
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