Physiological traits and metabolic profiles of contrasting rice cultivars under mild salinity stress during the seedling stage

This study aimed to investigate the effects of mild salinity stress on some physiological traits and metabolic profiles rice during seedling stage. Three cultivars differing in response, ‘KDML105’ (salt-sensitive, local Thai jasmine rice), ‘IR29’ (salt-sensitive ‘Pokkali’ (salt-tolerant were subjected by flood-irrigated with 40 mM NaCl. Salinity significantly reduces growth biomass sensitive cultivars. Electrolyte leakage also increased while relative water content (RWC) decreased. However, did not affect growth, electrolyte leakage, RWC tolerant cultivar. Na+/K+ ratio shoot root all Nevertheless, increase was higher than that ‘Pokkali’. The profile analysis showed uracil, L-proline, malonate, L-carnitine, L-lactate, guanine increased, but levels dihydroxyacetone glycine decreased under conditions. In ‘IR29’, melatonin, gamma-aminobutyrate, acetate increased. ‘Pokkali’, however, sugar alcohols sugars slightly when exposed pathway revealed one involved ‘KDML105’: aminoacyl-tRNA biosynthesis, three those ‘IR29’: arginine proline metabolism, sulfur butanoate metabolism. difference salt-tolerance salt-sensitive provides new insights identify additional novel biomarkers will help better understand mechanisms for salt tolerance rice.