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Detection of Homologous Recombination Intermediates via Proximity Ligation and Quantitative PCR in Saccharomyces cerevisiae

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First Reported Sexual Recombination Between Pyrenophora teres Isolates from Barley and Barley Grass.

Buddhika Amarasinghe Dahanayaka¹, Alexandros G Sotiropoulos¹, Niloofar Vaghefi^1,2

¹Centre for Crop Health, University of Southern Queensland, Toowoomba, QLD 4350, Australia.

|June 27, 2024

Summary

Sexual recombination between Pyrenophora teres from barley and barley grass was confirmed. This finding challenges previous studies and suggests a risk of new pathotypes affecting commercial barley.

Keywords:

Hordeum leporinum Hordeum vulgare genetic divergence hybrids net blotch novel pathotypes

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Area of Science:

Plant Pathology
Genetics
Agricultural Science

Background:

Barley grass (Hordeum leporinum) is a host for Pyrenophora teres, the pathogen causing net blotch in barley (Hordeum vulgare).
Previous studies suggested genetic distinctness and host specificity between P. teres populations from barley and barley grass.

Purpose of the Study:

To investigate the potential for sexual recombination between P. teres isolates from barley and barley grass.
To assess the pathogenicity of P. teres isolates and their progeny on different hosts.

Main Methods:

Whole-genome sequencing of seven progeny isolates.
Phylogenomic analysis using neighbor-net network and haploblock plots.
Pathogenicity assays on barley and barley grass.

Main Results:

Confirmed sexual recombination between P. teres isolates from barley and barley grass.
P. teres isolates from barley grass are not host-specific and infect both barley and barley grass.
Progeny isolates are virulent on commercial barley cultivars.

Conclusions:

Contradicts previous findings of distinct P. teres populations; host and reproductive separation is incomplete.
Potential for novel pathotype generation through recombination between barley and barley grass isolates.
Risk of increased impact on commercial barley cultivars lacking resistance.