Abstract
The fungal pathogen Fusarium graminearum can cause destructive diseases on wheat, such as Fusarium head blight and Fusarium crown rot. However, a solution is still unavailable. Recently, N-hydroxypipecolic acid (NHP) was identified as a potent signaling molecule that is capable of inducing systemic acquired resistance to bacterial, oomycete, and fungal infection in several plant species. However, it is not clear whether NHP works in wheat to resist F. graminearum infection or how NHP affects wheat gene expression. In this report, we showed that pretreatment with NHP moderately increased wheat seedling resistance to F. graminearum. Using RNA sequencing, we found that 17% of wheat-expressed genes were significantly affected by NHP treatment. The genes encoding nucleotide-binding leucine-rich repeat immune receptors were significantly overrepresented in the group of genes upregulated by NHP treatment, while the genes encoding receptor-like kinases were not. Our results suggested that NHP treatment sensitizes a subset of the immune surveillance system in wheat seedlings, thereby facilitating wheat defense against F. graminearum infection.
Highlights
Wheat (Triticum aestivum) is one of the main sources of calories for humans (Food and Agriculture Organization of the United Nations, 2018)
We reported that N-hydroxypipecolic acid (NHP) pretreatment facilitates wheat seedling defense against F. graminearum and further investigated the global transcriptional changes in wheat upon NHP pretreatment, which will provide clues concerning the mechanism of action of NHP
N-Hydroxypipecolic Acid Pretreatment Alleviates Disease Symptoms Caused by F. graminearum
Summary
Wheat (Triticum aestivum) is one of the main sources of calories for humans (Food and Agriculture Organization of the United Nations, 2018). NHP accumulation was detected in Magnaporthe oryzae-inoculated barley and Brachypodium distachyon, and with exogenous NHP pretreatment, these monocotyledonous plants enhanced resistance to the fungal pathogen M. oryzae (Schnake et al, 2020). These results indicated a potential of using NHP to improve crop resistance to pathogens. In Arabidopsis, transcriptomic response after 24-h treatment with exogenous Pip includes upregulation of a whole battery of plant immune-related and SAR-relevant genes, which underlies Pip-triggered resistance (Hartmann et al, 2018). We reported that NHP pretreatment facilitates wheat seedling defense against F. graminearum and further investigated the global transcriptional changes in wheat upon NHP pretreatment, which will provide clues concerning the mechanism of action of NHP
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