Differential sensitivity of two common groundsel biotypes (Senecio vulgaris L.) to several s-triazine herbicides Public Deposited

http://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/2v23vz218

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  • Studies were initiated to determine the response of two common groundsel biotypes (Senecio vulgaris L. ) to several s-triazine herbicides. Herbicides tested were: 2-chloro-4,6-bis(ethylamino)-striazine (simazine), 2-chloro-4-(ethylamino)-6-(isopropylamino)- s-triazine (atrazine) 2-(sec-butylamino)-4-(ethylamino)-6-methoxys- triazine (GS-14254), 2, 4-bis(isopropylamino)-6-methoxy-striazine (prometone), 2-(tert-butylamino)-4-(ethylamino)-6-methylthio- s-triazine (terbutryn), and 2, 4-bis(isopropylamino)-6- methylthio-s-triazine (prometryne). One biotype was much more susceptible than the other. Sensitive plants were effectively controlled by 0. 5 ppm of atrazine and simazine, 1 ppm of GS-14254 and prometone, and 4 ppm of prometryne. The resistant biotype failed to show any symptoms of photosynthesis inhibition at the highest rates tested, i. e. 4 ppm of simazine and 30 ppm for atrazine, GS- 14254, prometone, and prometryne. Both biotypes were resistant to terbutryn at 30 ppm. When a triazine herbicide was applied, the susceptible plants became chlorotic and died; resistant plants never exhibited these symptoms. Photosynthesis was completely inhibited by simazine in susceptible (S) plants but resistant (R) plants were unaffected. Photosynthesis in the susceptible biotype resumed when the herbicide was removed after 24 hours. Absorption and metabolism of simazine were explored as possible explanations for the herbicide tolerance exhibited by the R biotype. Both biotypes absorbed the herbicide equally well, and no differences in simazine metabolism were found which could explain the mechanism of resistance. Plants of both biotypes were subjected to ¹⁴C-simazine for up to 96 hours. The greatest concentration of ¹⁴C activity (80 to 90%) was located in the chloroform-soluble fraction of the foliage tissue of each biotype. The ¹⁴C in this fraction of the plant extracts was determined by thin-layer chromatography to be similar to ¹⁴C- simazine. Small amounts of ¹⁴C activity (10-1 5%) were isolated in the water-soluble fraction of the plant extracts, but time-course studies revealed no differential increase in watersoluble simazine metabolites by either biotype. A similar metabolism study using corn was conducted, which substantiated the findings of numerous workers. Several alternative explanations for the difference in triazine sensitivity between the two common groundsel biotypes are suggested.
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  • description.provenance : Approved for entry into archive by Patricia Black(patricia.black@oregonstate.edu) on 2013-12-05T16:15:57Z (GMT) No. of bitstreams: 1 RadosevichSteven1973.pdf: 1339553 bytes, checksum: 443a427aa9b846d1fd6c26293001194e (MD5)
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  • description.provenance : Approved for entry into archive by Patricia Black(patricia.black@oregonstate.edu) on 2014-01-14T20:24:14Z (GMT) No. of bitstreams: 1 RadosevichSteven1973.pdf: 1339553 bytes, checksum: 443a427aa9b846d1fd6c26293001194e (MD5)
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