Poster De Conférence Année : 2024

Exploring the variability of cuticle compounds in different grapevine cultivars

Résumé

Plant cuticle is the first shield which protects aerial epidermis against environment constraints, notably by limiting water loss, UV irradiation damage, pest infestation and pathogen infection. This lipophilic barrier is subdivided in two parts: (i) an external wax layer constituted of very-long-chain fatty acids, primary alcohols, alkanes, aldehydes or triterpenoids, and (ii) a deeper cutin polymer made of hydroxy-/epoxy- fatty acid monomers, which is to a certain extent integrated to the cell wall. Cuticular compounds identification and quantification are well established in different species such as grapevine, but rarely over a wide range of cultivars. By targeting a single organ maturity, we provide the first leaf and berry cuticle composition comparison study which integrates about fifty grape varieties from the same vineyard. GC-MS coupled with GC-FID analyses indicate that leaf waxes are mostly composed of primary alcohols 1-hexacosanol or 1-octacosanol while berry waxes are dominated by triterpenoids oleanic and ursolic acids. Classically, cutin of both organs contains predominantly hydroxylated palmitic acid and hydroxylated or epoxylated stearic and oleic acids. Despite the similar composition for each organ cuticle, wax and cutin compounds were differentially accumulated according to cultivars. This study supplies an overview of cuticle diversity within the same species taking grapevine as model. Cuticle relationship with agronomic traits observed during the sampling year will be highlighted as well as variety tolerance against abiotic and biotic stress.

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Dates et versions

hal-05262789 , version 1 (16-09-2025)

Identifiants

  • HAL Id : hal-05262789 , version 1

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Erwan Chavonet, Sarah Bernardo, Alexandra Besse, Laura Marolleau, Zhan Xi, et al.. Exploring the variability of cuticle compounds in different grapevine cultivars. 6th International Symposium on Plant Apoplastic Barriers (PADiBa), Sep 2024, Girone, Spain. ⟨hal-05262789⟩
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