Halopriming imparts tolerance to salt and PEG induced drought stress in sugarcane

Sugarcane, a glycophyte grown in the tropical and subtropical regions, is frequently subjected to soil salinity, affecting the yield and quality of the harvest. The ameliorative efficiency of salt priming on emergence and plantlet growth was examined in sugarcane cultivars which are known to vary in salt tolerance under field conditions. Salt priming with NaCl (100 mM) improved both the percent and rate of germination of the sets of the tolerant (Co 62175) and moderately tolerant (CoM 265) varieties compared to sensitive (CoC 671) and test variety (Co 86032). Salt priming during germination also improved the growth performance of two-month-old sugarcane plants in terms of shoot length, shoot and root fresh weight when subjected to 15 day iso-osmotic (-0.7 MPa) NaCl (150 mM) or polyethylene glycol (PEG 8000: 20%. w/v) stress. The primed plants exhibited lower salt- and dehydration-induced leaf senescence. The results suggest salt priming as an efficient approach for imparting abiotic stress tolerance in sugarcane. (C) 2009 Elsevier B.V. All rights reserved.