Tranbarger Timothy auteur aut IRD Domonhedo H. auteur aut IRD Cazemajor M. auteur aut IRD Dubreuil C. auteur aut IRD Fischer U. auteur aut IRD Morcillo F. auteur aut IRD text journalArticle eng text/pdf reformatted digital access The programmed loss of a plant organ is called abscission, which is an important cell separation process that occurs with different organs throughout the life of a plant. The use of floral organ abscission in Arabidopsis thaliana as a model has allowed greater understanding of the complexities of organ abscission, but whether the regulatory pathways are conserved throughout the plant kingdom and for all organ abscission types is unknown. One important pathway that has attracted much attention involves a peptide ligand-receptor signalling system that consists of the secreted peptide IDA (INFLORESCENCE DEFICIENT IN ABSCISSION) and at least two leucine-rich repeat (LRR) receptor-like kinases (RLK), HAESA (HAE) and HAESA-LIKE2 (HSL2). In the current study we examine the bioactive potential of IDA peptides in two different abscission processes, leaf abscission in Populus and ripe fruit abscission in oil palm, and find in both cases treatment with IDA peptides enhances cell separation and abscission of both organ types. Our results provide evidence to suggest that the IDA-HAE-HSL2 pathway is conserved and functions in these phylogenetically divergent dicot and monocot species during both leaf and fruit abscission, respectively. specialized organ abscission fruit abscission leaf abscission cell separation peptide signalling LRR-RLK Populus oil palm abscission zone 076 020 8 6 art. 143 [8 ] 2019 2223-7747 https://www.documentation.ird.fr/hor/fdi:010076204 10.3390/plants8060143 2223-7747 [F B010076204] https://www.documentation.ird.fr/hor/fdi:010076204 https://horizon.documentation.ird.fr/exl-doc/pleins_textes/divers19-07/010076204.pdf IRD - Base Horizon / Pleins textes 2019-08-05 2025-02-24 fdi:010076204 fre