Acquired QoI resistance in Pyrenophora teres through an interspecific partial gene transfer by Pyrenophora tritici-repentis?
Tóm tắt
In European QoI monitoring studies from 2019 on Pyrenophora teres, the causal agent of net blotch in barley, an isolate (ISO-2210) was identified with a level of QoI resistance that had never been observed before. ISO-2210 is highly resistant to QoI fungicides, which is caused by the G143A mutation in the mitochondrial-inherited cyt b gene. A part of its cyt b gene around codon 143 differs from P. teres and is identical to P. tritici-repentis, the causal agent of tan spot in wheat. The rest of the cyt b gene and other analyzed genes from mitochondrial and chromosomal DNA are identical to P. teres. In genes which differed between net type and spot type, the ISO-2210 sequences were identical to those of net type. ISO-2210 morphologically resembles P. teres and is pathogenic on barley, where it produces typical net blotch symptoms. An analysis of European isolates from 2019 and field samples from 2019 and 2020 did not indicate additional findings of such “hybrid”-isolates.
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