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“The IDA signaling peptide and its receptors: Conserved structure – diverse functions”

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Wednesday 18 May 2016, 11:00 - 12:30


Cell-to-cell communication by peptides, signalling through plasma-membrane bound leucine-rich repeat receptor-like kinases (LRR-RLKs), is important for all aspects of plant growth and development and has been found to regulate cell division, cell expansion, cell differentiation, cell separation and cell death. Cell separation events like shedding (abscission) of floral organs after pollination and facilitation of lateral root emergence are in Arabidopsis controlled by the 12 amino acid long peptide INFLORESCENCE DEFICIENT IN ABSCISSION (IDA) that bind and activate the LRR-RLKs HAESA (HAE) and HAESA-LIKE2 (HSL2). Phylogenetic analyses have identified IDA homologues encoding peptides near to identical to the Arabidopsis version in all orders of flowering plants, suggesting that it virtually has been unchanged throughout the evolution of the Angiosperms. Amino acids in the receptor LRR involved in peptide ligand binding are strongly conserved in HAE/HSL proteins. Genome and gene duplications have however increased the number of IDA-LIKE (IDL) and HSL genes. In Arabidopsis, we have genetic and biochemical evidence for a novel IDL-HSL peptide-ligand receptor pair involved in sloughing and renewal of columella root cap tiers. We hypothesize that IDL/HSL signalling in general function as regulator of cell separation events, and thus may also control seed, fruit and leaf abscission in other species than Arabidopsis, including important crops.

Location Jozef Schell seminar room
Contact Prof Reidunn Birgitta Aalen
Department of Biosciences
University of Oslo