AI Article Synopsis
- Blue light makes Nicotiana benthamiana more susceptible to late blight disease caused by Phytophthora infestans, with a clear link to the roles of blue light photoreceptors (phototropins) and specific proteins in regulating disease resistance.
- The study specifically identifies the potato NRL protein StNRL-9, which negatively affects resistance to late blight by interacting with blue light receptors and promoting the degradation of an immune regulator.
- Unlike StNRL1, which inhibits certain immune responses, StNRL-9 does not affect cell death caused by the pathogen, suggesting that these proteins have different mechanisms in regulating plant immunity.
Article Abstract
Blue light enhances the susceptibility of Nicotiana benthamiana to Phytophthora infestans, a causative agent of late blight disease. Investigating how blue light affects potato late blight resistance is an interesting aspect of exploring new ways to control late blight disease. Blue light photoreceptor phototropins (phot1, phot2) and their downstream interact protein StNRL1 have been shown to negatively regulate late blight resistance. In order to investigate whether other potato NPH3/RPT2-Like (NRL) family members are involved in regulating late blight resistance, this study focused on the potato NRL proteins containing RxSxS motif at the C-terminus. Another potato NRL protein StNRL-9, containing RxSxS motifs, was found to negatively regulate P. infestans resistance in potato and N. benthamiana. Overexpression of StNRL-9 in potato and N. benthamiana suppresses the accumulation of reactive oxygen species (ROS) and expression of the PTI marker genes NbWRKY7 and NbWRKY8. Similar to StNRL1, StNRL-9 interacts with the blue light receptors Stphot1 and Stphot2 on the cell membrane and could promote the degradation of a positive immune regulator StSWAP70. However StNRL-9 does not inhibit INF1-mediated cell death (ICD), which is different from the StNRL1 that inhibits ICD, indicating that both StNRL1 and StNRL-9 inhibit plant immunity in diverse ways. This study provides valuable information for further exploration of how plant phototropins and NRL family proteins regulate plant immunity.
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| http://dx.doi.org/10.1111/ppl.14594 | DOI Listing |
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