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Cytological Studies of Nymphaea Species Available in Bangladesh

A Hossain
Professor Sultanul Alam Cytogenetics Laboratory, Department of Botany, University of Rajshahi, Rajshahi-6205, Bangladesh

G Kablr
Department of Botany, University of Rajshahi, Rajshahi

M M Ud-deen
Department of Crop Science & Technology, University of Rajshahi, Rajshahi

A M S Alam
Department of Agronomy and Agricultural Extension, University of Rajshahi, Rajshahi

Abstract/ Executive Summary:

The present investigation was undertaken in order to study the somatic karyotypes of four species of Nymphaea available in Bangladesh. Karyotypes of four species of Nymphaea revealed that most of the chromosomes were metacentric indicating their primitive nature and chromosome counts revealed a polyploid series of tetraploid, pentaploid and hexaploid based on X=14. Findings of the present study indicated that Nymphaea pubescens is a hexaploid (6X=84, white flower) which might have originated by chromosome doubling of Nymphaea daubeniana (3X=42) while Nymphaea rubra and Nymphaea nouchali (Type-1) are tetraploid (4X=56) species.

Keywords: Nymphaea, karyotype

Location: Rajshahi district

Start Date: 01-07-2005

End Date: 30-06-2006

Program Area: Variety and Species

Commodity: Lily

Objectives:

To study the somatic karyotypes of four species of Nymphaea available in Bangladesh.

Methodology:

Four species of Nymphaea comprising six different types were used as plant material in this study. The species were Nymphaea pubescens, Nymphaea alba (it might be cultivated somewhere else, but it was found to be grown wild in different places at Rajshahi, Bangladesh from where it was used as experimented material), Nymphaea rubra and Nymphaea nouchali (Type 1,2 and 3) and they were collected from different parts of Rajshahi district. A thorough morphological study was made on these species. They were then differentiated into species and types with the help of available literature and the data obtained from this study. To count the chromosome number as well as to study chromosome morphology the root tips of different species were fixed 1:3 acetoalcohol and preserved in 70% ethanol just aiter pre-treatment with the saturated solution of para-dichlorobenzene (PDB). Chromosome staining was performed following the schedule of Haque et al. (1976). Photomicrographs were made from the metaphase plates and the chromosomes were measured from cameralucida drawings .

Source of Information: Journal of Bio- Science, Vol: 15, PP: 7-13, 2007, ISSN: 1023-8654

Article Link (Online Journal):

Funding Source:

1. Government

Budget:

Total Budget (Tk.) :

Achievement/Findings:

Findings of the present study indicated that Nymphaea pubescens is a hexaploid (6X=84, white flower) which might have originated by chromosome doubling of Nymphaea daubeniana (3X=42) while Nymphaea rubra and Nymphaea nouchali (Type-1) are tetraploid (4X=56) species.

Knowledge Management: Journal