How many filamentd are required.In the lateral.Conjuction of spirigyra?
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Lateral conjugation: It occurs between the cells of same filament among homothallic species of Spirogyra. It occur by two methods
a) Indirect lateral conjugation: In this method, two adjacent cells of same filament develop lateral outgrowth. Due to lateral outgrowth and enzymatic activities the septum between the cells breaks forming conjugation tube. The male gamete moves through the conjugation tube and fused with female gamete forming zygote or zygospore, which develop into new filament.
b) Direct lateral conjugation: It is primitive type of conjugation occurring in few species. In this type, lower cell of the two adjacent cells get enlarged and form barrel shaped female gamete, while other behave as male gamete. The male gamete develop pointed boring organ which create pore mechanically or enzymatically on middle of the septum. The protoplasm of male gamete migrate through the pore and fused with female gamete forming zygospore which develop into new filament under suitable condition.
a) Indirect lateral conjugation: In this method, two adjacent cells of same filament develop lateral outgrowth. Due to lateral outgrowth and enzymatic activities the septum between the cells breaks forming conjugation tube. The male gamete moves through the conjugation tube and fused with female gamete forming zygote or zygospore, which develop into new filament.
b) Direct lateral conjugation: It is primitive type of conjugation occurring in few species. In this type, lower cell of the two adjacent cells get enlarged and form barrel shaped female gamete, while other behave as male gamete. The male gamete develop pointed boring organ which create pore mechanically or enzymatically on middle of the septum. The protoplasm of male gamete migrate through the pore and fused with female gamete forming zygospore which develop into new filament under suitable condition.
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Sexual reproduction occurs by a process known as conjugation, in which cells of two filaments lying side by side are joined by outgrowths called conjugation tubes.
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