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

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

Authors :
Dahanayaka BA
Sotiropoulos AG
Vaghefi N
Poudel B
Martin A
Source :
Phytopathology [Phytopathology] 2024 Nov; Vol. 114 (11), pp. 2385-2393. Date of Electronic Publication: 2024 Nov 21.
Publication Year :
2024

Abstract

Barley grass ( Hordeum leporinum ), which often occurs in proximity to commercial barley ( H. vulgare ) cultivars, is an alternative host to Pyrenophora teres , an economically important pathogen causing net blotch in barley. This study is the first to report the sexual recombination of P. teres isolates collected from barley with those collected from barley grass. The sexual recombination between P. teres isolates from barley and barley grass was confirmed using a neighbor-net network and haploblock plots based on whole-genome sequencing of seven progeny isolates. Pathogenicity assays revealed that P. teres isolates from barley grass were not host specific and could infect both barley and barley grass, and the progeny isolates were virulent on commercially grown barley cultivars. Our results contradict previous population and pathogenicity studies of P. teres isolates obtained from barley and barley grass that have reported that the two populations are genetically distinct and host specific, suggesting that isolates collected from barley or barley grass could be two different entities. Despite the genetic divergence of P. teres isolates from barley and barley grass revealed through our phylogenomic analysis, there seems to be no complete host or reproductive separation between these populations. Therefore, there is a potential for generation of novel pathotypes through sexual recombination between P. tere s isolates associated with barley and barley grass, with a risk of increased impacts on commercial barley cultivars that do not carry resistance to these pathotypes.<br />Competing Interests: The author(s) declare no conflict of interest.

Details

Language :
English
ISSN :
0031-949X
Volume :
114
Issue :
11
Database :
MEDLINE
Journal :
Phytopathology
Publication Type :
Academic Journal
Accession number :
38935445
Full Text :
https://doi.org/10.1094/PHYTO-12-23-0497-R