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Controlling levels and tolerance mechanisms of red rice accessions to protox inhibitor herbicide, oxyfluorfen

DOI: 10.5958/2348-7542.2017.00004.3    | Article Id: 004 | Page : 15-20
Citation :- Controlling levels and tolerance mechanisms of red rice accessions to protox inhibitor herbicide, oxyfluorfen. Res. Crop. 18: 15-20
Young Beom Yun, Se Ji Jang, Sang Soo Kim, Ha Il Jung, Yong In Kuk yikuk@sunchon.ac.kr
Address : 1Department of Oriental Medicine Resources, Sunchon National University, Suncheon, 540–742, Republic of Korea; 2Department of Plant Medicine, Sunchon National University, Suncheon, 540–742, Republic of Korea.; 3Division of Soil and Fertilizer, National Academy of Agricultural Science, RDA, Wanju, 55365, Republic of Korea

Abstract

Red rice (Oryza sativa L.) is one of the most troublesome weeds in most rice growing regions of the world. Thus, this study was conducted to determine the tolerance levels of various red rice accessions to the protox inhibitor, oxyfluorfen and also examined tolerance mechanisms in selected red rice accessions. Tolerance levels obtained from seed bioassay were lower than those obtained from whole-plant bioassay. Twenty-one of 38 red rice accessions in seed bioassay and 37 of 38 accessions in whole-plant bioassay were tolerant to oxyfluorfen. The most tolerant accession, R 2, was >20 times more tolerant in wholeplant bioassay and 13 times more tolerant in seed bioassay than the susceptible accession, R 116. This was supported by the results of experiments on levels of superoxide, H2O2 and MDA productions. In addition, the accumulations of proto IX in R 116 were more increased than in R 2 after oxyfluorfen treatment. The tolerance mechanism in R 2 was not related to higher antioxidant enzyme activities. However, higher ascorbate contents may contribute to greater tolerance of R 2 to oxyfluorfen.

Keywords

Herbicide  protox inhibitor  red rice  tolerance mechanism.

References

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