The effect of temperature and water stress on laboratory germination of Eucalyptus globulus Labill. seeds of different sizes

Germination rate and germination capacity of Eucalyptus globulusLabill. increased significantly with increasing temper- ature (13o to 33 oC) for all seed sizes to an optimum at 28 oC, then decreased. Biggest seeds generally germinated best at all te mpera- tures. Germination was also very sensitive to water potential (0 to -0.75 MPa), with no germination occuring at potentials belo w -0.25 MPa. Eucalyptus globulus / germination / polyethylene glycol / seed size / temperature / water potential