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| Hlavní autoři: | , , , , , |
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| Médium: | Recurso digital |
| Jazyk: | angličtina |
| Vydáno: |
Zenodo
2026
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| Témata: | |
| On-line přístup: | https://doi.org/10.5281/zenodo.18629189 |
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- <p><span>Nitrogen fertilization is essential for crop yield but can increase susceptibility to rice blast<strong>,</strong> a phenomenon known as Nitrogen-Induced Susceptibility (NIS). The genetic architecture governing natural variation in NIS remains poorly characterized. To address this, we performed a genome-wide association study (GWAS) using a diverse panel of 268 rice accessions from the rice diversity panel 2, under controlled nitrogen regimes 0N (control),1N (</span><span>100 mg/L NH₄NO₃</span><span>), 2N (</span><span>200 mg/L NH₄NO₃</span><span>). Our analyses defined a NIS Index (NISI), which revealed extensive polymorphism. GWAS identified several significant loci, including a novel locus on chromosome 8 (NIS4) harboring F-box protein genes. Physiological dissection showed that a 'negative NIS' phenotype (enhanced resistance under high nitrogen) correlated with a rapid, pathogen-triggered defense response, characterized by immediate induction of peroxidase activity and lignin biosynthesis. Conversely, susceptible lines exhibited delayed defense. Gene expression analysis linked active nitrogen assimilation (GS/GOGAT cycle) to susceptibility. We conclude that NIS polymorphism is genetically controlled and hinges on the host's ability to redirect nitrogen resources toward early defense activation during pathogen invasion.</span></p>