By H. D. Kumar, H. N. Singh (auth.)
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Additional resources for A Textbook on Algae
In species of Trentepohlia eells of the prostrate system form a powdery mass which is dispersed by wind and ean give eise to new plants. ASEXUAL REPRODUCTION Asexual reproduetion involves the formation of one or more of the foIJowing types of spores: zoospores, apJanospores, autospores, hypnospores, carpospores, tetraspores, endospores and exospores. These may be forrned in any vegetative eell (Ulothrix), or in specially differentiated eells ealled sporangia (Trentepohlia, Ectocarpus and Dietyota).
This leads to the creation of new combinations of genes by pooling together in one line of descent the genes derived from two different parents, thus resulting in a reshuffiing ofthe gene material. The recombinants so produced can then be subjected to natural selection. In procaryotic organisms recombinants are formed by such processes as conjugation, transformation and transduction, none of which involves true karyogamy and meiosis. This genetic recombination in bacteria and bluegreen algae accordingly falls short of the true and complete definition of sexuality in the sense adopted here, even though it fulfils the samefunction as true sexuality.
While most of them thrive in biologically normal habitats, so me can successfully end ure extremes of temperature, light intensity, desiccation, and high or low concentrations of dissolved nutrients. Species of Mastigocladus and Phormidium are impor- 52 A TEXTBOOK ON ALGAE tant members of the flora of hot water springs and can tolerate temperatures as high as 75°C. On the other hand, species of Phormidium are found in the frigid arctic lakes and certain others,collected from the Antarctic, have experimentally been shown to survive freezing.