Soluble sugars and proline accumulation play a role as effective indices for drought tolerance screening in Persian walnut ( Juglans regia L.) during germination

摘要: Introduction . Drought stress is the major factor affecting growth, development and production of walnut trees. In Iran, approximately 33 Mha land affected by salinization drought stress. Finding genetic resources tolerant to at different growth stages important for such semi-arid regions. Our aim was understand better adaptive mechanisms that enable genotypes population survive under stress, provide some useful clues tree breeding toward improved tolerance with utilization existing drought-tolerant resources. Materials methods . To study mechanism(s) involved in Persian genotypes, induced using polyethylene glycol-6000 produce water potentials 0 Mpa (control), –0.10 MPa, –0.50 MPa, –0.75 MPa, –1.00 MPa, –1.50 MPa –2.00 MPa. The amount proline soluble sugar accumulation four (‘Panegine20 ’, ‘Lara’, ‘Serr’ ‘Chandler’) were determined after being exposed various potential levels. Results rates seed germination all significantly reduced low external potentials. Plants had a higher sugars roots shoots ’ lower starch their tissues. These results imply roles as solutes conferring resistance these genotypes. free levels also increased response They than sensitive ones (‘Lara’ ‘Serr’). Proline more roots. However, fluctuations Conclusion support direct correlation between degree content. As consequence, concentrations could be used biochemical marker level plants.