Tissue-Specific Regulation of Na⁺ and K⁺ Transporters Explains Genotypic Differences in Salinity Stress Tolerance in Rice.

ABSTRACT: Rice (Oryza sativa) is a staple food that feeds more than half the world population. As rice is highly sensitive to soil salinity, current trends in soil salinization threaten global food security. To better understand the mechanistic basis of salinity tolerance in rice, three contrasting rice cultivars-Reiziq (tolerant), Doongara (moderately tolerant), and Koshihikari (sensitive)-were examined and the differences in operation of key ion transporters mediating ionic homeostasis in these genotypes were evaluated. Tolerant varieties had reduced Na⁺ translocation from roots to shoots. Electrophysiological and quantitative reverse transcription PCR experiments showed that tolerant genotypes possessed 2-fold higher net Na⁺ efflux capacity in the root elongation zone

SUBMITTER: Liu J 

PROVIDER: S-EPMC6838216 | biostudies-literature | 2019

REPOSITORIES: biostudies-literature