scholarly journals Remarkable recent changes in the genetic diversity of the avirulence gene AvrStb6 in global populations of the wheat pathogen Zymoseptoria tritici

2021 ◽  
Author(s):  
Christopher Stephens ◽  
Fatih Ölmez ◽  
Hannah Blyth ◽  
Megan McDonald ◽  
Anuradha Bansal ◽  
...  
Keyword(s):  
Genetic Diversity ◽  
Avirulence Gene ◽  
Zymoseptoria Tritici

scholarly journals Remarkable recent changes in genetic diversity of the avirulence gene AvrStb6 in global populations of the wheat pathogen Zymoseptoria tritici

2020 ◽  
Author(s):  
Christopher Stephens ◽  
Fatih Ölmez ◽  
Hannah Blyth ◽  
Megan McDonald ◽  
Anuradha Bansal ◽  
...  
Keyword(s):  
Genetic Diversity ◽  
Gene Interaction ◽  
Protein Isoforms ◽  
Septoria Tritici Blotch ◽  
Septoria Tritici ◽  
Avirulence Gene ◽  
Zymoseptoria Tritici ◽  
Reference Isolate ◽  
Receptor Like Kinase ◽  
Global Population

SUMMARYSeptoria tritici blotch (STB), caused by the fungus Zymoseptoria tritici, is one of the most economically important diseases of wheat. Recently, both factors of a gene-for-gene interaction between Z. tritici and wheat, the wheat receptor-like kinase Stb6 and the Z. tritici secreted effector protein AvrStb6, have been identified. Previous analyses revealed a high diversity of AvrStb6 alleles present in historic Z. tritici isolate collections, with up to ~ 18% of analysed isolates possessing the avirulence isoform of AvrStb6 identical to that originally identified in the reference isolate IPO323. With Stb6 present in many commercial wheat cultivars globally, we aimed to assess potential changes in AvrStb6 genetic diversity and the incidence of alleles allowing evasion of Stb6-mediated resistance in more recent Z. tritici populations. Here we show, using targeted re-sequencing of AvrStb6, that this gene is universally present in field isolates sampled from major wheat-growing regions of the world between 2013–2017. However, in contrast to the data from studies of historic isolates, our study revealed a complete absence of the originally described avirulence isoform of AvrStb6 amongst modern Z. tritici isolates. Moreover, a remarkably small number of alleles, each encoding AvrStb6 protein isoforms conditioning virulence on Stb6-containing wheat, were found to predominate among modern Z. tritici isolates. A single virulence isoform of AvrStb6 was found to be particularly abundant throughout the global population. These findings indicate that, despite the ability of Z. tritici to sexually reproduce on resistant hosts, AvrStb6 avirulence alleles tend to be eliminated in subsequent populations.

Sexual reproduction of Zymoseptoria tritici on durum wheat in Tunisia revealed by presence of airborne inoculum, fruiting bodies and high levels of genetic diversity

2019 ◽  
Vol 123 (10) ◽  
pp. 763-772 ◽  
Author(s):  
M. Hassine ◽  
A. Siah ◽  
P. Hellin ◽  
T. Cadalen ◽  
P. Halama ◽  
...  
Keyword(s):  
Genetic Diversity ◽  
Sexual Reproduction ◽  
Durum Wheat ◽  
Fruiting Bodies ◽  
Zymoseptoria Tritici ◽  
Airborne Inoculum

scholarly journals Genetic diversity and population structure of Zymoseptoria tritici in Ethiopia as revealed by microsatellite markers

2020 ◽  
Vol 141 ◽  
pp. 103413
Author(s):  
Tilahun Mekonnen ◽  
Teklehaimanot Haileselassie ◽  
Stephen B. Goodwin ◽  
Kassahun Tesfayea
Keyword(s):  
Genetic Diversity ◽  
Population Structure ◽  
Microsatellite Markers ◽  
Zymoseptoria Tritici

Mitochondrial DNA-based genetic diversity and population structure of Zymoseptoria tritici in Tunisia

2016 ◽  
Vol 146 (2) ◽  
pp. 305-314 ◽  
Author(s):  
Mouna Naouari ◽  
Ali Siah ◽  
Mohamed Elgazzah ◽  
Philippe Reignault ◽  
Patrice Halama
Keyword(s):  
Genetic Diversity ◽  
Mitochondrial Dna ◽  
Population Structure ◽  
Zymoseptoria Tritici

Climate change will hit genetic diversity

Nature ◽  
2011 ◽  
Keyword(s):  
Climate Change ◽  
Genetic Diversity

Genetic diversity of malaria vector

Nature India ◽  
2007 ◽  
Author(s):  
Subhra Priyadarshini
Keyword(s):  
Genetic Diversity ◽  
Malaria Vector

Genetic diversity of HLA in the Indian population

1997 ◽  
Vol 56 (1-3) ◽  
pp. 233
Author(s):  
N Mehra
Keyword(s):  
Genetic Diversity ◽  
Indian Population

Genetic diversity of Peucedanum japonicum using Internal Transcribed Spacer (ITS) sequence

Planta Medica ◽  
2008 ◽  
Vol 74 (09) ◽  
Author(s):  
YH Kim ◽  
JA Ryuk ◽  
BS Ko ◽  
JW Lee ◽  
SE Oh ◽  
...  
Keyword(s):  
Genetic Diversity ◽  
Internal Transcribed Spacer ◽  
Its Sequence

Genetic diversity revealed by ISSR molecular marker in different species of Ocimum

Planta Medica ◽  
2010 ◽  
Vol 76 (12) ◽  
Author(s):  
K Shinde ◽  
V Shinde ◽  
J Kurane ◽  
A Harsulkar ◽  
K Mahadik
Keyword(s):  
Genetic Diversity ◽  
Molecular Marker

Genetic diversity and phytochemical characterisation of Sideritis scardica populations from Greece

2019 ◽  
Author(s):  
EV Avramidou ◽  
E Sarrou ◽  
P Papaporfiriou ◽  
E Abraham
Keyword(s):  
Genetic Diversity
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