Abstract: Hymexazol (3‐Hydroxy‐5‐methylisoxazole) as the main ingredients of HI (elicitor) was used to screen salt‐tolerant species from 122 salt‐tolerant rice (Oryza sativa L.) cultivars under specific inducement. The results showed that the local species R6 is highly induce‐sensitive. R6 showed salt tolerance during the whole growth period by using 1.0% NaCl solution after HI treatment. Cyclosporin A (CsA) and verapamil (VP) as P‐glycoprotein (PGP) inhibitors and rifampin (RFP) as a PGP elicitor were used to treat R6. The morphological traits, structure of the root, physiological characteristics of leaf and root systems, the content of endogenous hormones indole‐3‐acetic acid (IAA) and abscisic acid (ABA) etc. show that CsA, VP and RFP had remarkable effects on the rice's salt tolerance. Hymexazol inducement (HI) can improve the rice's salt tolerance greatly and make it more salt‐resistant.

Key words: P-glycoprotein elicitor, P-glycoprotein inhibitor, rice, salt tolerance.