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Resistance to paraquat in M azus pumilus
Author(s) -
Tsuji K,
Hosokawa M,
Morita S,
Miura R,
Tominaga T
Publication year - 2013
Publication title -
weed research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.693
H-Index - 74
eISSN - 1365-3180
pISSN - 0043-1737
DOI - 10.1111/wre.12012
Subject(s) - paraquat , catalase , weed , superoxide dismutase , biology , botany , antioxidant , horticulture , chemistry , food science , biochemistry
Summary M azus pumilus is an annual self‐pollinating weed that is commonly found in arable land, vegetable gardens and roadsides. This weed harbours insects and pathogens that attack vegetables. The mechanism of resistance to paraquat of M . pumilus found in O hita, J apan, was studied. Whole plant bioassays revealed that the resistant (R) biotypes were four to six times less susceptible than controls. Chlorophyll destruction of leaf discs by paraquat treatment in R biotypes was 4–20 times lower than those of susceptible (S) biotypes. Ferric reducing antioxidant power ( FRAP ) values in R biotypes were higher than those of S biotypes before and after paraquat treatments. The activity of superoxide dismutase ( SOD ) was also higher in R biotypes than those of S biotypes before and after treatment with paraquat, but the activities of ascorbate peroxidase ( APX ) and catalase ( CAT ) were not different between R and S biotypes. Change of ascorbate ( A s A ) contents before and after paraquat treatment was equivalent in both biotypes. These results indicate that the increased SOD activity and antioxidant capacity in R biotypes contribute to the resistance to paraquat of M . pumilus .