Chromosome conspectus of Kashmir Himalayan species of the genus Potamogeton L.
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Tropical Ecology https://doi.org/10.1007/s42965-020-00094-6
RESEARCH ARTICLE
Chromosome conspectus of Kashmir Himalayan species of the genus Potamogeton L. Aijaz Hassan Ganie1 · Zafar A. Reshi2 · B. A. Wafai2 Received: 21 April 2020 / Revised: 2 July 2020 / Accepted: 14 July 2020 © International Society for Tropical Ecology 2020
Abstract 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. Keywords Chromosome number · PMC meiosis · Potamogeton · Ploidy level
Introduction The genus Potamogeton is quite interesting chromosomally because of widespread aneuploidy and polyploidy (Les 1983; Hollingsworth et al. 1998; Kaplan et al. 2013). The genus Potamogeton s. l. (incl. Stuckenia and Groenlandia) is an exceptional case having five base numbers: x = 7, 11, 12, 13 and 15; hence, its variation in chromosome number has been used by some authors to hypothesize various taxonomic relationships as well as the putative ancestral group. Some high level polyploids, also are quite widespread; whereas, others are confined to specific habitats in Kashmir Himalaya. The 11 Potamogeton species that inhabit various water bodies of the Kashmir valley have never been investigated before for their chromosome number or ploidy status. Thus, the present study was undertaken to: (a) record the chromosome number/s of Kashmir Himalayan species of Potamogeton; (b) evaluate pollen mother cell (PMC) meiotic behaviour with respect to polyploidy; and (c) to compare base number
* Aijaz Hassan Ganie [email protected] 1
Department of Botany, Satellite Campus KU, Kargil, Jammu and Kashmir 194105, India
Department of Botany, University of Kashmir, Srinagar, Jammu and Kashmir 190006, India
2
and ploidy level with leaf habit, pollination efficiency, pollen fertility and seed set.
Materials and methods Species sampled During the present study only 11 well identified species of the genus Potamogeton were selected, which include P. lucens L., P. natans L., P. pusillus L., P. amblyphyllus C.A. Meyer, P. berchtoldii Fieb., P. crispus L., P. nodosus Poir., P. distinctus A. Bennett., P. pectinatus L., P. perfoliatus L. and P. wrightii Morong. Standard herbarium methods (Bridson and Foreman 1992) were used during collection, processing and preparation of the herbarium specimens. The voucher specimens have
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