Journal
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
Volume 20, Issue 10, Pages -Publisher
MDPI
DOI: 10.3390/ijms20102538
Keywords
abscisic acid; salicylic acid; crosstalk; RNA silencing pathway; bamboo mosaic virus
Funding
- Korea Research Fellowship program - Ministry of Science and ICT through the National Research Foundation of Korea (KRF) [2017H1D3A1A01054585]
- Vegetable Breeding Research Center through the Agriculture, the Food and Rural Affairs Research Center from the Ministry of Agriculture, Food and Rural Affairs, Republic of Korea [710001-3]
- National Research Foundation of Korea [2017H1D3A1A01054585] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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The RNA silencing pathways modulate responses to certain stresses, and can be partially tuned by several hormones such as salicylic acid (SA) and abscisic acid (ABA). Although SA and ABA are often antagonistic and often modulate different stress responses, they have similar effects on virus resistance, which are partially achieved through the antiviral RNA silencing pathway. Whether they play similar roles in regulating the RNA silencing pathway is unclear. By employing coexpression and promoter analyses, we found that some ABA- and SA-related transcription factors (TFs) are coexpressed with several AGO, DCL, and RDR genes, and have multiple binding sites for the identified TFs in the queried promoters. ABA and SA are antagonistic with respect to the expression of AGO1 and RDRs because ABA was able to induce these genes only in the SA mutant. Nevertheless, both hormones showed similarities in the regulation of other genes, for example, the induction of AGO2 by ABA was SA-dependent, indicating that ABA acts upstream of SA in this regulation. We inferred that the similar effects of ABA and SA on some genes resulted in the redundancy of their roles in resistance to bamboo mosaic virus, but that the two hormones are antagonistic with respect to other genes unrelated to their biosynthesis pathways.
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