Study on the Karyotype Analysis of Nymphaeaceae and Its Taxonomic Position

Abstract

Abstract:

The present paper reports the karyotypes of six species in the family

Nymphaeaceae (sensu lato), and discusses its taxonomic position. Results of the karyotype

analysis are as follows: (1) Nelumbo nucifera Gaertn. was found to have the karyotype 2n

= 16 = 9sm +4m + 3st, which belongs to 2B type. There was one heterozygous pair and one

pair of large subterminal chromosomes in the complement. (2) Victoria cruziana Orbign. was

shown to have the karyotype 2n= 24 = 8sm+8m+ 8T, which belongs to 2A type. The

chromosomes were the largest in the Nymphaeaceae. (3) Nymphaea stellata Willd. wag of

2n =28. No. 1 chromosome possessed two satellites. The chromosomes were the smallest in

the Nymphaeaceae. (4) Nuphar pumilum (Timm.) DC. had the karyotype 2n=34=18m

4+16sm, which belongs to 2A type. One satellite was on No. 8 chromosome and the other

was easily detached (5) Euryale fero Salisb. ex Konig et Sims. was of 2n=58. The 58

chromosomes were in 29 pairs. Its chromosomes were small. No. 1 chromosome possessed

two satellites. (6) Brasenia schreberi J. F. Gmel. was shown to have 2n=72. The 72 chro-

mosomes were in 36 pairs, which could be classified into 4 pairs of large chromosomes. 12

pairs of medium-sized ones and 20 pairs of small ones. Three satellites could be seen in some

karyotypes. Except N. nucifera, the karyotypes of all the species are first reported. The

great differences in the karyotype and morphological characteristics between Nelumbo and

the other members of the Nymphaeaceae suggest that the Nymphaeaceae (sensu lato) be di-

vided into two separate orders, namely Nelumbonales and Nymphaeales. Nelumbonales con-

tains a single family Nelumbonaceae and a monotypic genus Nelumbo, while the other plants

belonging to the Nymphaeaceae which constitute the order Nymphaeales. Nymphaeales may

also be divided into two separate families, Cabombaceae and Nymphaeaceae. Cabombaceae

containing Brasenia and other genera is the most primitive in the Nymphaeales. Nymphaea,

Euryale, Victoria and Nuphar are included in the Nymphaeaceae.

Key words: Chromosome, Karyotype, Nymphaeaceae

Wei Ping-he, Chen Wei-pei, Chen Rui-yang. Study on the Karyotype Analysis of Nymphaeaceae and Its Taxonomic Position[J]. .

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Study on the Karyotype Analysis of Nymphaeaceae and Its Taxonomic Position

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