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Contributions to the karyology of euglenoid flagellates iv. trachelomonas ehrenberg emend. deflandre



Contributions to the karyology of euglenoid flagellates iv. trachelomonas ehrenberg emend. deflandre



Cytologia 51(4): 723-730



In spite of the abundance and world-wide distribution of euglenoid genera, our knowledge on the nuclear cytology of Euglenineae is very scanty. Further, as far as the Indian subcontinent is concerned, no one appears to have done any karyological work on this fascinating group of algae, excepting Sarma and Shashikala (1980) who investigated the karyology of three species of Euglena and Chaudhary and Prasad (1983, 1985) and Prasad and Chaudhary (1984) who studied the cytology of four taxa of Phacus and five of Strombomonas and one taxon of Astasia, respectively. In the genus Trachelomonas, only two species viz., T. grandis (n = 44-60) and T. bulla (n = 75) are reported to have been studied karyologically so far (Leedale 1966). In view of the paucity of informations and peculiar mitosis eight species of Trachelomonas collected from freshwater habitats in and around Varanasi were investigated karyologically in the present course of study and their nuclear features are being reported here for the first time. The chromosome numbers, all being estimates owing to inherent difficulties, ranged from n = 20 .+-. 1 in T. punctata to n = 96 .+-. 5 in T. dybowksii and are new to science. The structure and pattern of division of nuclei met with in these euglenoid flagellates do not conform to those of typical eukaryotic algae. From a perusal of chromosome numbers, though based on few counts it can be stated that both aneuploid and euploid have played decisive role in speciation and evolution of the genus Trachelomonas.

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Accession: 005048380

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DOI: 10.1508/cytologia.51.723


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