Reproduction and Development | Algae Reproduction

Algae

a large heterogeneous assemblage of photoautotrophic organisms which vary vastly in size

Vegetative reproduction

New individuals are formed from a vegetative organ

Fragmentation

A type of vegetative reproduction. New individual formed from broken off fragment.

Asexual reproduction

no need for union of gametes

Sporangia

where formation of spores for asexual reproduction.

Zoospores

no cell wall, motile, flagellate

Zoosporangium

produces Zoospores

Aplanospores

non-flagellatte, non-motile. Each spore can germinate to give rise to a new individual

Aplanosporangium

produces aplanospores

Akinetes

Resting spores. thick-walled, elongate. i.e. Oedogonium

Heterocysts

large specialized thick double-walled vegetative cells in some filamentous algae.

Autospores

non-motile resting spores that resemble the parent. i.e. Chlorella

Statospores

form of resting spores with Cysts and hypnospores

Hormogonia

structures at the tips of trichomes that can become differently shaped cells and become multicellular hormospores.

Hormospores

These tide over unfavorable conditions and when conditions become favorable they germinate into a new individual. ie. Westiella

Hypnospores

thick-walled aplanospores with abundant food reserves

Endospores

No flagellum. Thin-walled. Formed inside. i.e. Dermocarpa

Exospores

Larger. Thicked Double-walled. Cut off externally. i.e. Chamaesiphon

Laminaria saccharina

Brown Algae

Sexual Reproduction

Unione of gametes

Gametangia

where gametes are formed

Zygote

form when union of gametes

karyogamy

fusion of the 2 nuclei of the two gametes

plasmogamy

fusion of two gametes cytoplasm

Isogamy

gametes with two different genotypes

Heterogamy

gametes of two different sizes

Oogamy

Gametes presence of male and female

Cell Division(Vegetative Reproduction)

Vegetative Reproduction achieved by mere fision or division of cells

Autocolony Formation

Vegetative reproduction where formation of reproductive colonies. As seen in Volvocales such as Eudorina

Chlorophyta

Green Algae.

Phaeophyta

Brown Algae.

Pyrrophyta

dinoflagellates

Chrysophyta

Golden Algae

Rhodophyta

Red Algae

Euglenida

eukaryotic flagellates

Diatoms

phytoplankton

Thallus

the body of an organism that is not differentiated into true stems roots or leaves and lacks a vascular system

Fragmentation

New individual can emerge from seperated parts. Examples are Caulerpai

Charophyceae

A type of charophyte green algae