The toxicity induced by phosphinothricin and methionine sulfoximine in rice leaves is mediated through ethylene but not abscisic acid
2002
Tsai, Y.C. | Chen, C.T. | Hsu, Y.T. | Kao, C.H.
The possible role of ethylene and abscisic acid (ABA) in regulating the toxicity of detached rice leaves induced by phosphinothricin (PPT) and methionine sulfoximine (MSO), both known to be glutamine synthetase (GS) inhibitors, was studied. During 12 h of incubation, PPT and MSO inhibited GS activity, accumulated NH4+ and induced toxicity of detached rice leaves in the light but not in darkness. PPT and MSO treatments also resulted in an increase of ethylene production and ABA content in a light dependent way. Addition of fluridone, an inhibitor of ABA biosynthesis, reduced ABA content in rice leave but did not prevent NH4+ toxicity of rice leaves induced by PPT and MSO. Cobalt ion, an inhibitor of ethylene biosynthesis, affected PPT- and MSO-induced toxicity of detached rice leaves but had no effect on PPT- and MSO-induced NH4+ accumulation. Results suggest that ethylene but not ABA may be responsible for PPT- and MSO-induced toxicity of detached rice leaves.
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