Abstract
Genus Arachis comprises 82 species distributed into nine taxonomic sections. Most Arachis species are wild and those from Arachis section have been evaluated for many traits, since they can be used in peanut breeding. Most of the remaining species have been neglected and understudied. Recently, resveratrol content and expression of a resveratrol synthase gene were analyzed in wild Arachis species. Our aim was to expand the knowledge about resveratrol in Arachis, analyzing species from five sections and evaluating the expression of a resveratrol synthase (RS) gene responsive to ultraviolet light (UV) along the time. In a first experiment, the resveratrol content after UV induction was analyzed on detached leaves of 12 species from five sections. Variation was observed among species and accessions of the same species. The highest contents were found in A. lignosa (843.9 μg/g) and A. triseminata (745.4 μg/g). In a second experiment, RS expression and resveratrol content in four species and one synthetic amphidiploid were analyzed at 0, 7, 15 and 24 h pos induction (hpi) with UV. In most genotypes, the highest RS expression level was at 0 hpi, whereas the highest resveratrol content was at 15 hpi. Our results suggested that resveratrol is ubiquitously present in the genus Arachis with different capacities of synthesis among species and accessions in response to ultraviolet treatment. Presence of resveratrol in wild Arachis species adds new value to these genetic resources.
Highlights
Genus Arachis comprises 82 species distributed into nine taxonomic sections
The average resveratrol contents found in leaves of 17 accessions of 12 Arachis species after 15 hpi with ultraviolet light (UV) radiation are presented in Table 1, Experiment 1
In this study after UV induction, we found five accessions of five species (A. glandulifera, A. palustris, A. praecox, A. lignosa, and A. triseminata) with higher resveratrol content than Polygonum cuspidatum, suggesting those Arachis species have potential to be used for resveratrol extraction
Summary
Genus Arachis comprises 82 species distributed into nine taxonomic sections. Most Arachis species are wild and those from Arachis section have been evaluated for many traits, since they can be used in peanut breeding. The resveratrol content and resveratrol synthase (RS) expression were studied in four Arachis genotypes (two wild diploid species and two allotetraploids)[19] showing significant variation in RS expression and resveratrol content among samples Both studies evaluated leaves after 15 h of UV induction, since previous data showed that the highest levels of resveratrol in A. hypogaea were. The present study broadened the knowledge on resveratrol synthesis and metabolism in genus Arachis, as it describes the resveratrol content in species of five Arachis taxonomic sections (Arachis, Caulorrhizae, Extran‐ ervosae, Procumbentes and Triseminatae) and the expression profile of a resveratrol synthase (RS) gene and the corresponding metabolite in five wild Arachis species
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