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InvisibleMykes logos
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Registered: 08/05/12
Posts: 1,108
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Reproductive mode and life cycle of the ash dieback pathogen Hymenoscyphus pseudoalbidus
    #17436342 - 12/23/12 10:21 AM (11 years, 4 months ago)

Greetings,

I'm on winter break from uni atm...
but I have access to pretty much every
scientific database that my school has
to offer through their online library...
and I gots wayyy too much time on my hands
cause I've been reading this stuff for fun :shocked:

this is a new study (Nov. to Dec. 2012)
for all you European shroomerites
and your dying trees :frown:

Found in the "Proquest Science and Technology" database in the journal titled "fungal genetics and biology" (it's not a complete and done study yet so they only had the abstract and other limited information posted- this is the most recent study in the journal).

Here's the abstract:
Quote:

Ash dieback caused by the fungal pathogen Hymenoscyphus pseudoalbidus is currently ravaging in Europe, killing Fraxinus excelsior and Fraxinus angustifolia trees of all age classes. The aim of this work was to elucidate aspects of the reproduction biology of this fungal pathogen and its cryptic, non-pathogenic sister species Hymenoscyphus albidus. The mating type (MAT) locus of both species was identified, partly sequenced and characterized. Whereas a heterothallic MAT organization was detected in H. pseudoalbidus, H. albidus was shown to be structurally homothallic. The molecular MAT determination of H. pseudoalbidus was confirmed by crossing experiments on sterile ash petioles. Crossings of strains exhibiting alternate MAT idiomorphs produced fertile apothecia whereas crosses of strains with identical MAT idiomorphs were never successful. Offspring genotyping with microsatellites (MSs) and the MAT marker confirmed that both parental strains were involved in apothecia formation. In addition, polymorphic MS were shown to follow Mendelian inheritance. However, for yet unknown reasons the MAT ratio of progenies of one successful cross revealed a significant segregation distortion. Based on the MAT sequences of H. pseudoalbidus a multiplex PCR was developed, allowing for a quick and reliable MAT determination. The PCR was applied to screen the MAT ratio of two H. pseudoalbidus populations derived from the country of the disease outbreak in Poland and two populations from the disease periphery in Switzerland. None of the screened populations showed a significant deviation from the 1:1 ratio, expected under random mating. Therefore, an initial clonal distribution through asexually produced conidiospores as observed for other fungal pathogens holds not true for H. pseudoalbidus. Instead, our data is highly supportive for a distribution through ascospores. Leaf petioles collected in the field were thoroughly analyzed for the number of different colonizing strains and their mating behavior. Up to eight different H. pseudoalbidus genotypes were found on a single petiole. Cross-fertilizations of strains on the same petiole and fertilizations of unknown strains from outside were found, indicating that fertilization is mediated by spermatia. The presented study complements our understanding of the life cycle of this highly destructive pathogen. The possibility to perform sexual crosses in the lab provides ample opportunities for further genetic studies of H. pseudoalbidus and related species in the future. Copyright © 2012 Elsevier Inc. All rights reserved.




Author:
Forest Pathology and Dendrology, Institute of Integrative Biology
(IBZ), ETH Zurich, Universitätsstrasse 16, 8092 Zurich, Switzerland.
Electronic address: andrin.gross@env.ethz.ch. 

Cited (APA):
    P, L., A, & C, R. (2012). Reproductive mode and life
cycle of the ash dieback pathogen hymenoscyphus pseudoalbidus. Fungal
Genetics and Biology : FG & B, 49(12), 977-986. doi: http://dx.doi.org
/10.1016/j.fgb.2012.08.008

I hope you enjoyed reading,
and I hope we learn more about these species.

Cheers from :sunny: but somehow freezing cold south FL :confused:

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OfflineAmanita virosa
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Re: Reproductive mode and life cycle of the ash dieback pathogen Hymenoscyphus pseudoalbidus [Re: Mykes logos]
    #17488449 - 01/02/13 08:16 PM (11 years, 4 months ago)

We have a similar pathogen killing our ashes both f. Americana and f.  Penstlvanicum. We have lost many in my farm  complicated and prolly spread by the emerald ash borer

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Re: Reproductive mode and life cycle of the ash dieback pathogen Hymenoscyphus pseudoalbidus [Re: Amanita virosa]
    #17492067 - 01/03/13 03:15 PM (11 years, 4 months ago)

Wow, I didn't know that.

I'll try to find some scientific studies
related to the problem here in the US!

PS glad someone looked at this post... haha:tongue:

cheers from :sunny: FL

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OfflineEddeee
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Re: Reproductive mode and life cycle of the ash dieback pathogen Hymenoscyphus pseudoalbidus [Re: Mykes logos]
    #17492098 - 01/03/13 03:20 PM (11 years, 4 months ago)

I have about 12 Ash trees on my land and although they seem ok except for one. The one is starting to get top die off. The Department of Agriculture sets traps every year on my property although I have checked them myself I have never found the Emerald Ash borer beetle. There kind of a pretty insect though I have found them before,


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we are nothing but atoms trying to figure out what atoms are.


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Re: Reproductive mode and life cycle of the ash dieback pathogen Hymenoscyphus pseudoalbidus [Re: Eddeee]
    #17518755 - 01/08/13 06:15 PM (11 years, 4 months ago)

Saw this article today...

I had no clue it was such a big deal!
Damn beetles :mad2:

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InvisibleAmphibolos
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Re: Reproductive mode and life cycle of the ash dieback pathogen Hymenoscyphus pseudoalbidus [Re: Mykes logos]
    #17523183 - 01/09/13 03:50 PM (11 years, 4 months ago)

Im happy that we arent stuck with this problem yet

Thanks to the winter :smile:


Ashes are such beautiful trees it is sad that they will end with the same faith as the american elms


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"Homo sum ; humani nihil a me alienum puto"

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Re: Reproductive mode and life cycle of the ash dieback pathogen Hymenoscyphus pseudoalbidus [Re: Amphibolos]
    #17526915 - 01/10/13 09:53 AM (11 years, 4 months ago)

Quote:

Amphibolos said:
Im happy that we arent stuck with this problem yet

Thanks to the winter :smile:


Ashes are such beautiful trees it is sad that they will end with the same faith as the american elms




I wish there was some type of beetle that could destroy all the brazilian peppers and melaleuca trees down here...

I will post about the OP soon when I find more information on it...
I've been really into fungal diseases lately.

cheers

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