Vitislactone, a non-canonical strigolactone exudated by grapevine rootstocks in response to nitrogen starvation
Language
EN
Article de revue
This item was published in
Phytochemistry. 2023-11, vol. 215, p. 113837
English Abstract
Strigolactones are compounds produced by plant roots in response to nutrient deficiency, acting both as local and systemic signals to control development and nutrition. Strigolactones are exuded in the rhizosphere to ...Read more >
Strigolactones are compounds produced by plant roots in response to nutrient deficiency, acting both as local and systemic signals to control development and nutrition. Strigolactones are exuded in the rhizosphere to positively influence interactions with beneficial microbes. LC-MS/MS analysis shows that two genetically distinct grapevine rootstocks exudate one or two non-canonical strigolactones when subjected to low nitrogen conditions. Gene expression profiles and orobanche seed germination assays confirm that the biosynthesis and exudation of noncanonical compounds is the preferred pathway. The first compound, corresponding to heliolactone or 6-epiheliolactone, is only exuded by the rootstock showing lower shoot branching and a higher level of mycorrhization with arbuscular mycorrhizal fungi. The structure of the second compound exuded by both rootstocks was identified by NMR and LC-MS/MS analysis. It is a non-canonical strigolactone, which has never been identified in another species. This first identification of a natural compound with the potential to stimulate beneficial rootmicrobe interactions in grapevines opens new perspectives in viticulture.Read less <
English Keywords
Exudates
Grapevine
Lc-Ms/Ms
Nitrogen
Nmr
Strigolactones
Vitis Riparia
Vitislactone