A Preliminary Study on the Polyploid Series and Cytogeography of Najas graminea

Abstract

Abstract:

Najas graminea is first reported to have a population of 2n = 12. A cytogeographic

survey of this species reveals that the diploid (2n= 12) population is so far only found in

Yunnan (You Jun 8804, in Herb. WH) and its adaptive radiation has probably resulted in the

distribution pattern of N. graminea today in Asia. The polyploids are more widely distributed

than the diploid, but no correlation was found between polyploids and geographic distribu-

tion, soil or climate types. The comparison of the karyotypes between diploid and hexaploid,

lack of inter-specific hybridization in nature, and the occurrence of semi-cryptic polyploids

in the populations suggest that polyploids of N. graminea are the result of autopolyploidy (at

least in China). The highest polyploidy (almost 17X), the most asymmetrical karyotype, and

the most reduced floral structure (the spathe is absent) support the suggestion that the

N. graminea be the most advanced taxon in Najas.

Key words: Najas graminea, Polyploid series, Cytogeography, Autopolyploid, Evolution

You Jun, Sun Xiang-Zhong, Wang Hui-Qin. A Preliminary Study on the Polyploid Series and Cytogeography of Najas graminea[J]. .

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A Preliminary Study on the Polyploid Series and Cytogeography of Najas graminea

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