AI Article Synopsis
- Plant growth-promoting rhizobacteria (PGPR) enhance lateral root formation by increasing auxin accumulation in lateral root primordia (LRP).
- The accumulation of auxin activates AUXIN RESPONSE FACTOR 7 and 19 (ARF7/19), which further promotes the formation of lateral roots.
- Reactive oxygen species (ROS) are necessary for this auxin-dependent process, as they are generated through specific enzymes and play a key role in facilitating lateral root development following bacterial treatment.
Article Abstract
Plant growth-promoting rhizobacteria (PGPR) can promote lateral root formation, while the underlying mechanisms are not fully understood. Here, we found that subsp. inoculation enhanced auxin accumulation in lateral root primordia (LRP). Upon reaching LRPs, auxin activated the AUXIN RESPONSE FACTOR 7 and 19 (ARF7/19) and promoted lateral root formation in . Moreover, we found that reactive oxygen species (ROS) is required for auxin-dependent lateral root emergence, and upregulated the expression of RESPIRATORY BURST OXIDASE and (/), leading to the accumulation of ROS in LRP. Although scavenging ROS or / mutants exhibited decreased lateral roots after inoculation, the bacteria-triggered auxin signals were not altered. Conversely, the application of auxin or mutants defective in auxin signaling disturbed -derived ROS accumulation in lateral roots. Collectively, these results suggest that ARF7/19-dependent auxin signaling activates / to produce ROS, coordinately facilitating lateral root development after P. chlororaphis treatment.
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| http://dx.doi.org/10.1021/acs.jafc.4c08019 | DOI Listing |
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