Oedogonium Part II Reproduction & Life cycle..

reproduction and life cycle of oedogonium

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Oedogonium reproduce by
A. Vegetative methods
B. Asexual methods
C. Sexual methods
B. Asexual methods take place by zoospores and akinetes.
Zoospores
*Formed during favourable condition
*Recently divided cap cell functions as the zoosporangium.
*The cell gets filled with abundant reserve food and a slight contraction of the protoplast from the cell wall takes place.
*Finally zoospore is formed and is uninucleate, multiflagellate &large.
*A crown of about 30 flagella is formed around the hyaline spot
*On maturation the wall of the zoosporangium splits near the apical region and the adjacent cell moves apart to make a gap for the liberation of zoospore
*After liberation, the zoospore swims for about an hour and later develops into new oedogonium.

Sexual reproduction
• The sexual reproduction in Oedogonium is of advanced Oogamous type (the male and the female gametes differ morphologically as well as physiologically).
• The male gametes are produced in male sex organ c/a Antheridia and the female gametes are produced inside female sex organ c/a Oogonia.
• The factors influencing sexual reproduction are alkaline medium, deficiency of nitrate, light and dark periods and increased temperature.
• Depending upon the nature of antheridia producing plants, Oedogonium species are of two types: (Macrandrous and Nannandrous Species)