Plasticity in Pinus pinaster populations of diverse origins: Comparative seedling responses to light and Nitrogen availability

•Nitrogen effects on Pinus pinaster seedlings plasticity depend on the light availability.•Better seedling performance with full sunlight and high-N.•Higher dry weight allocation to needles in full sunlight and medium light/high-N.•Higher dry weight allocation to stem with shade, regardless N availability.•Higher allocation to root in low-N seedlings in full sunlight and medium light.