Europe (Spain, Portugal, Italy and France). In Spain, maritime pines are distributed in twenty
provenance regions that belong to three geographical groups: The Atlantic, the Continental
and the Mediterranean. This work examines the capacity of megagametophytes from four of
these provenances for the induction and establishment of somatic embryogenesis (SE). The
effect of 24-epibrassinolide (EBR) on SE response is also assayed.