What's happening at IRRI
Tuesday, October 11, 2016, 01:15pm - 02:15pm
Lotus LysM receptors and their role in microbial perception
Sheena Ricafranca Rasmussen
Ph.D. in Plant Molecular Biology and Genetics
Aarhus University, Denmark
Abstract: Plants are constantly exposed to both beneficial and pathogenic microbes, and the interaction with these microorganisms may be vital for plant survival. Characterization of legume mutants has shown that a common genetic program is required for interaction with both rhizobia and arbuscular mycorrhizal (AM) fungi leading to symbiotic nitrogen fixation or mycorrhizal root colonization that enhance the plants nitrogen and phosphor uptake, respectively. Recent results show that plant receptor proteins containing the carbohydrate-binding LysM-motif are involved in the recognition and discrimination of rhizobia from pathogenic microbes while recognition of AM fungi have remained unknown. A large family of LysM receptor-like kinases has been identified in the model legume Lotus japonicus. Many of these genes have not yet been functionally characterized, however, the two LysM receptor-like kinases (LjNFR1 and LjNFR5) are key molecular components required for perception of the lipochitooligosaccharide (LCO) signalling molecules (Nod factors) produced by rhizobia, and for the initiation of signalling events leading to symbiotic nitrogen fixation. Recent studies revealed that AM fungi also produce LCOs and short-chain chitin oligomers that are recognized by legume hosts, and elicit similar physiological responses in plant cells as Nod factors. However, the receptor(s) for these AM produced signalling molecules remain unknown.
I will present our current understanding and latest results on the involvement of LysM receptors during root-symbiosis with AM fungi.
CESD Conference Rm 1, DL Umali Bldg.