Integrative analysis of two russeted and non-russeted closely related apple varieties during fruit development provides new insights about the cuticle/suberin interplay

ABSTRACT: Apple russeting is characterized by the deposition of suberin in the inner part of the epidermal cell walls. It develops at the fruit surface when the integrity of the cuticle has been lost. Cutin and wax composition (including triterpene profile) is also affected in russeted skin. In the present work, the fruit growth kinetic of two closely related apple varieties, ‘Canada Gris’ and ‘Canada Blanc’, which display russeted and waxy skin phenotypes, respectively, was investigated. We used a combination of transcriptomic, proteomic, and metabolomic approaches to better understand the molecular events associated with cuticle failure and suberization. A particular interest was also given to the triterpene specifically found in russeted skins and their synthesis. Our results indicate that the decreased synthesis of cutin and wax, observed in russeted skin throughout fruit development, is a determining factor for russeting. We identified a lipid transfer protein (LTP-3) as a potential key player in cuticle formation. Metabolomics highlighted a large diversity of triterpene-hydroxycinnamates in russeted tissues whose accumulation was highly correlated with suberin-related genes, including some enzymes belonging to the BAHD (HXXXD-motif) acyltransferase family. This study shed light for the first time on the crosstalk between triterpene and suberin pathways.

INSTRUMENT(S): TripleTOF 5600+

ORGANISM(S): Malus Domestica

TISSUE(S): Plant Cell, Leaf

SUBMITTER: Céline LECLERCQ  

LAB HEAD: Céline LECLERCQ

PROVIDER: PXD022712 | Pride | 2022-02-22

REPOSITORIES: Pride