Question

Are dikaryotic fungi always heterokaryotic?

Answer 1

yes I think so . For being dikaryotic , the nucleus has to be compatibile ( and the factor is usually associated with a single locus and hence they are usually describes as + or -) with each other . And the compatibility factor present in the locus seems to dictate whether the hyphae will come together and the walls will dissolve .So if its dikaryotic its nuceli has to be heterokaryotic ( i.e the nuclei are different from each other).
The compatibility factors seem to dictate whether the fungi can mate .seems to be like a fail safe tojsut prevent hyphae with the same genetic makeup form mating with each other.
This is an assumption based on what I read .

This seems to hold true for most of the different forms of dikaryons.
http://www.fungionline.org.uk/7sexual/5dikaryon.html
http://books.google.com/books?id=-Hj8iJV16YAC&pg=PA557&lpg=PA557&dq=homokaryotic+hyphae&source=bl&ots=mxyGji117r&sig=kKWOFCtPAvOoxCvpD0VmX0dgydU&hl=en&ei=3p1STpWPLoPmiALatemUAQ&sa=X&oi=book_result&ct=result&resnum=3&ved=0CCsQ6AEwAg#v=onepage&q=homokaryotic%20hyphae&f=false

Answer 2

Heterokaryotic hyphae have two kinds of genetically different nuclei
Homokaryotic hyphae have genetically similar nuclei
Dikaryotic compartment has two genetically distinct nuclei
Monokaryotic compartment has a single nucleus
Dikaryotic hypha is always heterokaryotic
Monokaryotic hypha is always homokaryotic
Dikaryotic hyphae have some properties of diploids, both genomes transcribed

Answer 3

Homokaryotic will always be monokaryotic?

Answer 4

Nope
If a single cell compartment of a mycelium or hyphae has 1 nucleus its monokaryotic.If the compartment has multiple copies of the same nucleus then its homokaryotic not monokaryotic (i.e there a similar copies not a single copy) .
I have seen usages like ------monokaryotic (homokaryotic) ---which is just used to denote that the mycelia in question has 1 type or similar type of gene.

Answer 5

Can you please give an example of a fungus that is homokaryotic?

Answer 6

Well being a homokaryote is more a stage in the complex life cycle of a fungus . most of the times the spores are haploid and they give rise to homokaryotic mycelia when then form a heterkaryote with a compatibile strain . It remains in this stage for quite some time this stage being the most stable then undergoes karyogamy becomes diploid and then undergoes meiosis and forms haplid spores and in some cases diploid spores theres a lot of variation in this and even some prefer dipolid spores. Bring into this mix the fact that cells can under go genetic recombination via parasexual cycle too.

Scientisits do cultivate homokaryotic stains of wild fungi eg:- Rhizoctonia solani and homokaryotic stains are very desirable for commercial mushroom cultivation too. Just check out the no: of patents available for developing procedures for producing homokaryote lines.

Answer 7

The sentence above came out wrong.Rhizoctonia solani is a pant pathogenic fungus . Homokaryotic stains have been isolated fot this fungus and used in propagation for studies.

Answer 8

Two homokaryotic mycelia fuse togather is plasmogamy.