Genetic variability in 3D coarse root architecture in Pinus pinaster

摘要

The Pious Pinaster Landes forest experienced recently very large damage through windthrow.3D coarse root architecture was measured in a 5-6-years-old provenance x progeny test. Both bya high throughput phenotyping procedure on 1150 trees and by precise 3D digitizing of 71 rootsystems. French atlantic coast provenances showed a strong unique and deep taproot, and alarge root biomass. The provenances of dry areas showed more shallow roots, but no differencesin root length could be found. No genetic variation for circular distribution of shallow root andno family variance for root architecture could be found in this planted trees. This variability inroot architecture of P. pinaster may be due to natural selection for anchorage and for drought.