Seed provenance, thermoperiod, and photoperiod affect low water potential tolerance during seed germination of the multipurpose exotic tree Prosopis juliflora

Abstract There is limited information about the importance of seed origin, thermoperiod, and photoperiod on low water potential tolerance during seed germination of habitat-indifferent plants, which grow well in saline and non-saline habitats. This study examined the effects of seed provenance, water potential, thermoperiod, photoperiod, and their interactions on seed germination of the multipurpose exotic tree Prosopis juliflora. Seeds from saline and non-saline habitats were germinated under various water potential levels at different thermoperiods and photoperiods. Seeds could endure up to −1.5 MPa water potential irrespective of origin. Germination of seeds from saline habitats was higher than those from non-saline habitats in −1.5 MPa. At 0 and -0.3 MPa, seeds germinated in a thermoperiod-insensitive manner in light. At