Agricultural Research Management Information System

Home
Research Summary
Search
About Us
- ARMIS
- Brochure
Contact Us
Report
User Request
Data Input
Help
- Operation Manual
  - PDF
  - Video
- Program Area & Commodity
We have reached 37600 number of research entries at this moment.

- Logout

Research Detail

Home
Research
Detail

Desmids of Some Selected Areas of Bangladesh. 3. Docidium, Pleurotaenium, Triplastrum and Triploceras

A. K. M. NURUL ISLAM
Department of Botany, University of Dhaka, Dhaka-1000, Bangladesh

NASIMA AKTER
Department of Botany, University of Dhaka, Dhaka-1000, Bangladesh

Abstract/ Executive Summary:

23 taxa belonging to Pleurotaenium, 2 under Triploceras and 1 each under Docidium and Triplastrum have been recorded in this paper from some selected areas of Bangladesh. Of these, 11 are new records for the country.

Keywords: Desmids, Docidium, Pleurotaenium, Triplastrum, Triploceras, Bangladesh

Location: In Bangladesh

Start Date:

End Date:

Program Area: Development of Host and Medicinal Plants

Commodity: Medicinal Plants

Objectives:

To determine the desmids of some selected areas of Bangladesh. 3. Docidium, Pleurotaenium, Triplastrum and Triploceras.

Methodology:

Docidium baculum de Bréb. var. baculum: (Prescott et al. 1975, 102). Cells straight, cylindrical or very slightly tapering; apex smooth, rounded-truncate, not dilated; base of semicell with single inflation, with several folds; cell length 207-210.2 μm; mid-diam. 11-14.20 μm; isthmus 8.5 μm; apex 7-10 μm. Specimen studied: Collected from a ditch within the Chittagong Univ. Campus on 19 March 1989; fairly common. Genus: Pleurotaenium Nägeli 1849: Cells straight, cylindrical, circular in cross-section, not deeply constricted in the midregion, wall smooth, undulate, nodose, or spinulose; apices truncate or rounded-truncate, sometimes with granules or teeth; wall smooth or punctate, in some species with thin and thick areas, never plicate at isthmus as in Docidium; usually, prominent ring-like thickening on the semicells present; chloroplast with several parietal bands; pyrenoids few to many, either in the parietal bands or in the axial zone. Allthough apparently similar, the Docidium is separated from Pleurotaenium chiefly by the presence of folds at the base of semicell, and by the usually smooth apices. Pleurotaenium coronatum (Bréb.) Rab. var. fluctuatum West- (Prescott et al. 1975): Cell length 269-298.20 μm; mid-diam. 19-21.3 μm; isthmus 17-18.5 μm; apex 14-17.1 μm; our material is very much smaller in size than the typical. Specimens studied: Dhaka: collected from a pond near Uttara Shopping Centre, near Zia Intern. Airport, Dhaka on 6 Sept. 1989; from Khilkhet beel, Dhaka on 6 Sept. 1989; Cox's Bazar: from a pond near Kalatali Shrimp Res. Inst. on 10 Dec. 1989. Pl. crenulatum Rab. var. crenulatum: Prescott et al. 1975 as Pl. ehrenbergii var. crenulatum, Pl. 45, Figs. 12-13). Cell length 586-729.50 μm; mid diam. 51-55 μm; isthmus 35-38.7 μm; apex 29-32.25 μm; in outline it is like Pl. trabecula (Ehr.) Reinsch, but it has apical tubercles; semicells broadening again beyond the basal inflation, with sides parallel or very slightly tumid toward the apex where there is an abrupt tapering; apex truncately rounded with 5-7 tubercles; wall sparsely punctate,. Specimen studied: Chittagong, collected from a ditch within Chittagong Univ. Campus on 19 March 1989. Pl. doliforme West & West var. doliforme: Cells straight, cylindrical, shape barrel-shaped, with fairly prominent median constriction; semicell with broad base and slightly attenuated apex; apex truncate, flattened with several conical (dendate) tubercles; cell wall with several transverse rings of thin and irregular to quadrangular areas; thin areas of polar region irregularly elongate; zygospore not found; cell length 277-288 μm; mid-diam. 48.3 μm; isthmus 34-37 μm; apex 21-27 μm. Pl. ehrenbergii de Bary var. ehrenbergii : (Foerster 1982; Ruzicka 1977. Cells relatively large, slightly constricted, semicells with conspicuous basal inflation and usually with 1-2 smaller swellings beyond (exception var. undulatum), margins of semicell slightly tapered to a rounded truncate apex with 7-10 tubercles (rounded or conical) present; wall punctate; chloroplast in longitudinal, parietal bands with several-many pyrenoids; cell length 227.2 μm; mid diam. 11.4 μm; isthmus 10 μm; apex 8.5 μm. Note: Our specimen is smaller than the typical form with thick wall and irregular shallow undulations. Specimens studied: Collected from a pond near Uttara Shopping Centre near the Zia Int. Airport on 6 Sept. 1989 and from a ditch near Kaliganj Railway Station, Kaliganj, Gazipur on 14 Aug. 1989; fairly common in both the collections.

Source of Information: Bangladesh J. Plant Taxon. 12(1): 11-23, 2005 (June)

Article Link (Online Journal):

Funding Source:

Budget:

Total Budget (Tk.) :

Achievement/Findings:

Cells straight, cylindrical, smooth, or with undulate margins, 8-26 times longer than broad; circular in cross-section, slightly constricted in the midregion, with an open sinus; apex usually truncate, rounded, sometimes dilated, smooth or rarely with a few intramarginal granules; base of semicell inflated, with 6-9 visible folds (plications) at the isthmus, the folds usually subtended by granules; cell wall smooth or faintly punctulate; chloroplast axial with irregular longitudinal ridges and 6-14 axial pyrenoids; zygospore unknown. It differs from the above variety by its undulate wall; cell length without spines 432- 445 µm, with spines 451-471 µm, mid-diam. without spines 25-32.3 µm, with spines 45- 51.6 µm; apex without spines 19-19.4 µm, with spines 41-45.2 µm; larger than the typical.

Knowledge Management: Journal