科研之友
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摘要
Poa annua L. (family Poaceae) is a cosmopolitan, cytologically variable and apomictic species. At present, cytomorphological studies have been carried out for North-Indian materials on 29 populations from Haryana (North Indian plains), Shiwalik hills and Kangra (H.P.) covering different attitudinal ranges (216-1489 m) of relatively unexplored areas. All the 29 populations are found to be tetraploid with n=14. Morphologically, plants of all the populations looked similar without any significant variation but cytologically speaking, among these, 24 populations show normal meiotic course whereas 4 populations show abnormal meiosis in the form of bridges, laggards, etc. The phenomenon of cytomixis has also been studied in 1 population. The variable number of B-chromosomes (1-3B) has been reported in some of the populations.
- 出版日期2010-9
