Reproduction in Fungi- Part-1: Vegetative Reproduction (Lecture Notes & PPT)

how fungi reproduce vegetatively

Vegetative Reproduction in Fungi

Ø  Fungi reproduce by vegetative, asexual and sexual methods

Ø  This post describes different types of Vegetative reproduction methods in fungi

Ø  Vegetative reproduction helps to increase the number of individuals in the population

Ø  Vegetative reproduction in fungi occurs by:

(1). Fragmentation

(2). Fission

(3). Bud fission

(4). Budding

(5). Gemmae

(6). Sclerotia

(7). Rhizomorphs

(8). Mycelial cords

(1). Fragmentation:

Ø  Mycelium gets fragmented into small fragments, each of which is able to develop into new individual

Ø  Fragmentation is common in filamentous fungi such as Rhizopus and Aspergillus

(2). Fission

Ø  Fission occurs in unicellular fungi such as Yeasts

Ø  Mature cells divided mitotically into two and the two daughter cells separates and give rise to two individuals

(3). Bud fission

Ø  It is a modified type of fission

Ø  In bud fission cross wall are developed near the base of the bud to separate bud from mother cell

Ø  Here only the buds undergo fission not the mother cell

(4). Budding

Ø  Bud like growth emerges out from the mature cells

Ø  Budding is commonly occurs in unicellular forms such as Yeast

Ø  Budding of Yeast may be of different types:

(a). Multilateral budding: buds arise at any point on the mother cell, but never again at the same site

(b). Uni-polar budding: budding repeated at same site on mother cell surface

(c). Bi-polar budding: budding restricted to both poles of the cell

(d). Monopolar budding: buds originate at only one pole of the mother cell

(5). Formation of Gemmae:

Ø  Gemmae are specialized thick walled aggregation of chlamydospres like structures

Ø  They are formed in un-favourable conditions (Example: Saprolegnia)

(6). Sclerotia:

Ø  Sclerotia (sclerotium) are pseudo-parencymatous mycelial aggregations

Learn more: Mycelial aggregations in fungi

Ø  Sclerotia can also overcome unfavourable conditions

Ø  Sclerotia can survive in the substratum (Eg. soil) for many years

Ø  Sclerotia are commonly produced by plant pathogenic fungi

Ø  The size and shape of sclerotia varies in different fungal groups

(7). Rhizomorphs:

Ø  They are root like mycelial aggregations found in some fungi

Ø  They are pseudo-parenchymatous hyphal modifications

Ø  They can also overcome unfavourable conditions

Ø  Rhizomorphs have high penetration capacity than individual hyphae and hence they have more pathogenic potential

Ø  Bits of rhizomorps that survive in the soil, can act as inoculum for the next round of infection during the onset of favourable conditions

(8). Mycelial cords

Ø  They are also thread like mycelial aggregations

Ø  Formed by the more or less parallel aggregation of hyphal strand in some fungi

Ø  Mycelial cords can also acts as bidirectional transport channels for nutrients

Ø  Mycelial cords also helps the fungi to establish and colonize new areas from a food rich area

Learn more: Asexual reproduction in Fungi

Learn more: Sexual reproduction in Fungi

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