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Physiological basis of bentazon tolerance in rice (Oryza sativa L.) lines by YUEH-CHI HAN; CHING-YUH WANG is a Agricultural and Biological Sciences article available to read on EtoBox.

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In the present study, 98.8 mm of bentazon was applied to 3‐leaf stage rice seedlings. Two tolerant lines, M202 and cv. TNG67, showed slightly visible injury, photosystem II inhibition, as well as a low level of lipid peroxidation 7 days after application compared with the susceptible lines. Further physiological study of the mechanism of differential tolerance among __Japonica__ and __Indica__ types indicated that, although the tolerant __Japonica__ lines M202 and cv. TNG67 absorbed more ^14^C‐bentazon, most of the ^14^C remained in the treated leaf or translocated to older leaves. However, two susceptible lines, FSK (__Japonica__) and IR36 (__Indica__), absorbed less ^14^C‐bentazon throughout the experiment, and most of the ^14^C was translocated from the treated leaves to younger leaves, which might result in the death of developing tissues. In addition, more bentazon residue and less polar metabolites were detected in these two susceptible lines. It is proposed that the higher tolerance of lines M202 and TNG67 to bentazon could be mainly due to a higher rate of metabolism of this herbicide, and partially due to less translocation to developing tissues.

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Author

YUEH-CHI HAN; CHING-YUH WANG

Publisher

John Wiley and Sons; Wiley (Blackwell Publishing); Blackwell Publishing Inc.; Wiley (ISSN 1444-6162)

Published

2002

Language

EN

Field

Agricultural and Biological Sciences (Life Sciences)