c7.6.10 – Volatile isoprenoids identify phylogeographical differences but do not reveal the genetic structure in cork oak (Quercus suber) European provenances

Loreto F *(1), Bagnoli F (2), Fineschi S (2)

(1) CNR Istituto di Biologia Agroambientale e Forestale, via Salaria km 29.300, I-00015 Monterotondo Scalo – RM, Italy. (2) CNR Istituto per la Protezione delle Piante, 50019 Sesto Fiorentino – FI, Italy
Collocazione: c7.6.10 – Tipo Comunicazione: Presentazione orale
7° Congresso SISEF *
Sessione 6: “Ecosistemi forestali e fattori ambientali” *

Contatto: Silvia Fineschi (silvia.fineschi@ipp.cnr.it)

Abstract: Emissions of volatile isoprenoids are strongly controlled by the environment, but these compound may also be used as chemotaxonomic markers, if the environmental impact is not strong. We used a “common garden” approach to clarify whether chemical profiles of volatile isoprenoid emission match biological diversity in cork oak, a monoterpene-emitting species that frequently hybridizes with other oaks and is widely distributed over south Europe. Cork oak provenances that have been genetically separated and now constitute different haplotypes were collected in Portugal, Spain, and Italy. They were planted in the common garden and emissions of volatile isoprenoids were recorded after a six-month long acclimation to the new conditions. It is shown that volatile isoprenoids might indeed suitably track geographical diversity even at the intraspecific level, whereas this is not observed in other evergreen oaks that have not been intensively bred. Differences in monoterpene emissions are not caused by introgression of the genetic material of other species into the cork oak germoplasm. It is speculated that breeding for productive traits might drive selection for isoprenoid diversity as an associated trait, indirectly and unintentionally modulating important adaptive mechanisms against biotic and abiotic stressors.

Citazione: Loreto F , Bagnoli F , Fineschi S (2009). Volatile isoprenoids identify phylogeographical differences but do not reveal the genetic structure in cork oak (Quercus suber) European provenances . 7° Congresso Nazionale SISEF, Isernia – Pesche (IS), 29 Set – 03 Ott 2009, Contributo no. #c7.6.10