By H. D. Kumar, H. N. Singh (auth.)
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Additional info for A Textbook on Algae
A good example of intercalary growth is fumished by the Laminariales (Phaeophyta) in wh ich the growth of the thallus is brought about by the activity of a meristem located at the junction of the stipe and the bl ade. , in Rivulariaceae, and CutJeriales. The thalli of the Charophyceae, Dictyotales and certain other algae grow by the activity of a single or a group of apical cells. SIPHONEOUS HABIT A siphoneous thaJlus is multinucleate and lacks septation except durinS the COMPARATIVE MORPHOLOGY 25 formation of reproductive organs.
The Iatter phenomenon, known as hoIogamy, occurs in a few species of Ch/amydomonas. Besides, three other modes of sexual reproduction based on the morphology and behaviour of the mating gametes are known. These are isogamy, anisogamy and oogamy. In isogamy, the gametes of a fusing pair are morphologically as weil as physiologically alike and are distinguishable genetically as plus or minus mating types. In anisogamy the gametes differ in size and motility, the smaller, more active gametes being male and the larger, less active being female.
If tbis number is smalI, tbe products are large and bebave as zoospores, and if tbe number is large, tbe resulting cells are small and bebave as gametes. Tbis view is supported by tbe observation tbat under certain conditions if tbe gametes fail to copulate they can act Iike zoospores. All these facts indicate tbat the gametes are derived from zoospores and that sex in algae bas originated as a result of accidental fusions between small-sized, weaker zoospores. Tbe origin of gametes (and hence tbe sex) from zoospores is a hypothesis developed mostly from observations made on materials collected from nature and it has yet to receive conclusive experimental support.
A Textbook on Algae by H. D. Kumar, H. N. Singh (auth.)