Salicylic acid metabolism and signalling coordinate senescence initiation in aspen in nature

0575691 - ÚEB 2024 RIV US eng J - Journal Article
Lihavainen, H. - Šimura, J. - Bag, P. - Fataftah, N. - Robinson, K. M. - Delhomme, N. - Novák, Ondřej - Ljung, K. - Jansson, S.
Salicylic acid metabolism and signalling coordinate senescence initiation in aspen in nature.
Nature Communications. Roč. 14, č. 1 (2023), č. článku 4288. E-ISSN 2041-1723
Institutional support: RVO:61389030
Keywords : WRKY70 TRANSCRIPTION FACTOR * RETICULUM STRESS RESPONSES * LEAF SENESCENCE
OECD category: Biochemical research methods
Impact factor: 16.6, year: 2022
Method of publishing: Open access
https://doi.org/10.1038/s41467-023-39564-5

Deciduous trees exhibit a spectacular phenomenon of autumn senescence driven by the seasonality of their growth environment, yet there is no consensus which external or internal cues trigger it. Senescence starts at different times in European aspen (Populus tremula L.) genotypes grown in same location. By integrating omics studies, we demonstrate that aspen genotypes utilize similar transcriptional cascades and metabolic cues to initiate senescence, but at different times during autumn. The timing of autumn senescence initiation appeared to be controlled by two consecutive “switches”, 1) first the environmental variation induced the rewiring of the transcriptional network, stress signalling pathways and metabolic perturbations and 2) the start of senescence process was defined by the ability of the genotype to activate and sustain stress tolerance mechanisms mediated by salicylic acid. We propose that salicylic acid represses the onset of leaf senescence in stressful natural conditions, rather than promoting it as often observed in annual plants.
Permanent Link: https://hdl.handle.net/11104/0345430