Meiotic Studies and B-Chromosomes in Sedum oreades (Decne.) R. Hamet (Crassulaceae) from Alpine Regions of Northwest Indian Himalaya

作者：Kumar Puneet^*; Singhal Vijay Kumar; Srivastava S K

来源：Cytologia, 2016, 81(3): 275-278.

DOI：10.1508/cytologia.81.275

• Bivalent
• Manimahesh Hills
• Pollen mother cell
• Non-synchronous disjunction

Meiotic studies carried out in the individuals of Sedum oreades (Decne.) R. Hamet (Crassulaceae), which exists at diploid level (n=11) revealed the presence of 0-4B-chromosomes, non-synchronous disjunction of bivalents, chromatin bridges, and laggards as well as some pollen sterility (8%) in the collection from Manimahesh Hills (Gauri Kund, 3930m, Chamba district, Himachal Pradesh). The present diploid chromosome count of n=11 is the first report from India but agrees with the earlier report from Nepal Himalayas. The presence of B-chromosomes in the species is also the first record for the species. The paper here discusses in detail the course of meiosis and the effect of B-chromosomes and other meiotic abnormalities on meiotic course and pollen fertility.

• 出版日期2016-9