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In the long-term evolutionary process，The ability of plants to form symbiosis with microorganisms，Obtain nutrients necessary for growth and development。Typical examples include nitrogen-fixing root nodules established by leguminous plants and rhizobia。Via Symbiote，Rhizobia convert atmospheric nitrogen into ammonia that plants can use。The occurrence of root nodules begins when the plant senses chitosan oligosaccharide secreted by rhizobia (Lipo-chitooligosaccharide, LCO) type ingredients，also known as nodulation factor。Perception of nodulation factors by plant receptors，Is essential for root nodule organogenesis and infection by rhizobia。Different leguminous plants have specific rhizobia symbiont groups，The mechanisms that determine this specificity remain unclear。

August 7, 2020，Professor Ton Bisseling, Chief of the Beijing Agricultural College Branch Center of the Advanced Innovation Center for Molecular Design Breeding of Forest Trees, published a forward-looking review paper titled "Specificity in legume nodule symbiosis" in Science magazine，Point bet365 online sports bettingout that the structural differences in nodulation factor receptors are the basis for plants to recognize different nodulation factors secreted by rhizobia，And analyzed future research directions。

By studying the leguminous model plant Lotus japonicus (Research on Lotus japonicus) and Medicago truncatula，Nodulation factor receptor LjNFR1/LjNFR5 identified，MtLYK3/MtNFP protein dimer。Agape japonicus，Medicago truncatula binds sulfated or fucosylated nodulation factors respectively。The crystal structure analysis of LjNFR1 and MtLYK3 proteins shows that，There are structural differences in a small motif of their first LysM domain，This difference determines which modified nodulation factor the plant recognizes。Given that this motif varies greatly among leguminous plants，It helps us further understand the evolution of legume-rhizobia signal recognition，At the same time, it laid the foundation for research on genetically modified plant nodulation and improving nitrogen fixation efficiency。

Related paper information:

https://science.sciencemag.org/content/369/6504/620?rss=1

Extension of thesis: The nodulation factor secreted by rhizobia is a chitin oligomer (Chitin oligomers，Structural variant of CO)。Except Rhizobium，Symbiotic arbuscular fungi and some ectomycorrhizae (Ectomycorrhizae，ECM) Fungus、Actinomycetes and other bacteria can synthesize CO compounds，Feeling these signals is the basis for the symbiote structure。bet365 online casinoThe vast majority of hosts infected by ectophytic fungi are woody plants。Professor Ton Bisseling was appointed as chief scientist of the Advanced Center for Molecular Design Breeding and Innovation of Forest Trees，The team is committed to chestnut、Study on the molecular mechanism and evolutionary process of ECM symbiont establishment in poplar and other forest trees。Professor Ton Bisseling is an academician of the Royal Netherlands Academy of Arts and Sciences，Former Director of the Dutch Society for Plant Science，EMBO member，Served as Science for a long time，Editorial board member of The Plant Cell and other magazines。It has established a vibrant new scientific research team at the Advanced Center for Forest Molecular Design Breeding and Innovation，Gathered a group of outstanding young researchers from well-known scientific research institutions at home and abroad；The team completed the sequencing analysis of the chestnut genome，Constructed chestnut/poplar transgenic system and in vitro interaction system with ectophytic fungi；Conducted simultaneously with Wageningen University in the Netherlands、French Academy of Agricultural Sciences、Swedish Agricultural University、Beijing Agricultural College、Beijing Forestry University、Cooperative research by the Chinese Academy of Forestry and other domestic and foreign units。We warmly welcome those at home and abroad who are interested in the genetic improvement and application of forest trees，Young talents joining bet365 online casinoin the functional research of rhizosphere microorganisms！

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