The present study represents an original investigation on the chromosome number and meiotic behaviour of eleven Potamogeton species inhabiting lotic and lentic freshwater bodies in the Kashmir Himalaya. The chromosome number of P. berchtoldii (2n = 4x = 28), P. crispus (2n = 12x = 84) recorded during the present study differed from earlier reports, while chromosome count for P. amblyphyllus (= Stuckenia amblyphyla) is newly reported for the genus. In P. natans two cytotypes were identified: tetraploid (2n = 4x = 52) and octoploid (2n = 8x = 104), the latter being the first report. The species characterized by abnormal anaphasic segregation also had low pollen fertility and fruit set. The present study also correlates base number and ploidy level with leaf habit, pollination efficiency and fruit set.

中文翻译：

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Potamogeton L.属的克什米尔喜马拉雅物种的染色体概观。

本研究是对11染色体数目和减数分裂行为的原始调查菹种栖息在喜马拉雅克什米尔和激流静水淡水水体。在本研究中记录的伯氏疟原虫（2n = 4x = 28），crispus（2n = 12x = 84）的染色体数与早期报道有所不同，而新报道了无光假单胞菌（  Stuckenia amblyphyla）的染色体数。为属。在P. natans确定了两种细胞类型：四倍体（2n = 4x = 52）和八倍体（2n = 8x = 104），后者是第一个报道。具有异常后生隔离特征的物种也具有较低的花粉育性和坐果。本研究还将碱基数和倍性水平与叶片习性，授粉效率和坐果率相关联。