In the quest to understand how legumes maintain immunity while forming symbiotic relationships with nitrogen-fixing rhizobia, this study identifies the cytoplasmic kinase MtLICK1/2 as a key player. Interacting with nodulation factor receptor MtLYK3, MtLICK1/2 promotes symbiotic signaling while dampening immune responses that could inhibit rhizobial infection. The research highlights reciprocal trans-phosphorylation between MtLICK1/2 and MtLYK3, crucial for effective nodule development and successful symbiosis. These findings could have significant agricultural implications for enhancing nitrogen fixation in leguminous crops.
Legume roots can secure nitrogen from symbiotic rhizobia while simultaneously maintaining resistance to pathogens, a balance that remains poorly understood in plant immunity.
The cytoplasmic kinase MtLICK1/2 interacts with the nodulation factor receptor MtLYK3, driving symbiotic signaling while suppressing the plant's immunity to enable symbiotic success.
This study reveals that MtLICK1/2 and MtLYK3 undergo reciprocal trans-phosphorylation during rhizobial symbiosis, indicating a complex interplay that enhances symbiotic signaling and reduces immunity.
Understanding the role of MtLICK1/2 and MtLYK3 in legume-rhizobium symbiosis could pave the way for improving nitrogen fixation in crops, crucial for agricultural sustainability.
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