Physio-biochemical traits in improved ‘KDML105’ jasmine rice lines containing drought and salt tolerance gene under drought and salt stress

Drought and salinity are important abiotic stress factors negatively affecting productivity of the world-renowned jasmine rice (Oryza sativa L. subsp. indica Kato) ‘KDML105’ in northeast Thailand. Two chromosome segment substitution lines (CSSLs) which were introgressed with drought tolerance quantitative trait loci (DT-QTLs), designated CSSL94 CSSL103, two improved lines, RGD1 RGD4, carrying salt tolerant gene (SKC1) used for evaluation growth, physiological biochemical traits response to conditions comparison (sensitive parental cultivar) DH103 (DT-QTL donor). Seedlings grown 21 d hydroponic solutions then subjected (20% polyethylene glycol 6000) or (150 mM NaCl) 10 d. Under both stresses, all four showed lower percent reduction growth compared ‘KDML105’. stress, CSSL103 had significantly higher relative water content (88% 89%) that (82%). These accumulated 42% 45% hydrogen peroxide, resulting 25% 32% malondialdehyde, less membrane damage (24% electrolyte leakage). On other hand, better RGD4 under ‘KDML105’, was associated an efficient maintenance ion homeostasis (57% 69% Na+/K+), 34% 43% 54% leakage. The introgression DT-QTL conferred not only but also recipient genotype. Likewise, SKC1 tolerance.