Question

Aspergillus reproduction takes place through a special structures.what are they (70 points)waiting get a chance to mark you as brainlist answer!!!..

Answer 1

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The Aspergillus reproduces by the three methods:

Vegetative

Asexual

Sexual

Vegetative reproduction of Aspergillus

Vegetative reproduction occurs by the fragmentation method, in which a vegetative hypha breaks into few fragments which then develops into a new vegetative body.

Asexual reproduction of Aspergillus

First, the foot cell develops a small outgrowth by absorbing nutrient from the substratum.

Then, the foot cell gives rise to the long and slender hyphae refers to conidiophore.

After that, the conidiophore grows and enlarges at the apex by the nuclear division to form a vesicle.

Vesicle then grows and undergoes mitotic nuclear divisions to form sterigmata.

Sterigmata are uninucleate which also undergoes mitotic division and transfers one nucleus to the secondary sterigmata.

These secondary sterigmata then form a chain of conidia in a basipetal arrangement.

After that, conidiospores gets detached from the hyphae either accidentally or through certain environmental factors and remains in the soil in the dormant state.

When the spores get favourable conditions they form a germ tube and undergo germination to form new vegetative hyphae.

Sexual reproduction of Aspergillus

The sexual reproduction occurs rarely only in the heterothallic species which contains both male and female hyphae. A.heterothallic is an example of the species that undergo sexual reproduction.

The heterothallic hyphae consist of female hyphae that refer to Ascogonium and the male hyphae which refer to Anthredium.

Ascogonium divides into three parts (Basal, middle and apical), which are multinucleate, septate and loosely coiled. Anthredium divides into two parts (Upper and lower) which are unicellular, multinucleate and septate.

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Answer 2

Asexual Reproduction of Aspergillus:

1. It takes place by the formation of conidia on conidiophores.

 

2. From the prostrate somatic mycelium arise many erect, thick-walled, aseptate and unbranched hyphae called conidiophores.

3. Thick-walled cell, from which a conidiophore arises, is termed as foot cell.

4. The tip or apex of the conidiophore becomes globular or swollen, and is known as vesicle.

5. Vesicle is multinucleate structure, and gives rise to many sterigmata or phialides, which cover its complete surface