Abstract
White mustard (Sinapis alba L.) plants, susceptible to 2,4-D, and scentless mayweed (Tripleurospermum maritimum L.) plants, resistant to 2,4-D, markedly differ in the distribution and metabolism of 2,4-D. When 2,4-D-14C was applied onto the leaf, radioactivity was found in mustard after 8 days in the entire plant, whereas in scentless mayweed radioactivity occurred mainly in the leaf onto which it was applied and in another one or two leaves, with the roots showing only traces of radioactivity. The two plant species differed both in the character and in the number and amount of metabolites detected in aqueous and ether fractions. The metabolite with Rf 0.63 -0.65, soluble in ethylether (39% of the total radioactivity applied), and that with Rf 0.35 -0.36 (23% of the total radioactivity) were present exclusively in the roots of scentless mayweed plants. The Rf values established indicate that the former metabolite may be a conjugate with the amino acids alanine and valine and the latter a hydroxylated derivate of 2,4-D. In the shoots of both plants, 2,4-D-14C was metabolized to identical metabolites with Rf 0.59 -0.61, which occurred in mustard plants only in trace amounts. Free 2,4-D-14C occurred in the shoots of both plants and in considerable amounts also in mustard roots; it could not be demonstrated in the roots of scentless mayweed. The two species did not differ in the uptake rate or in the amount of absorbed 2,4-D-14C.
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Chodová, D., Bergmannová, E. & Taimr, L. Investigations on the causes of low susceptibility of scentless mayweed to 2,4-D. Biol Plant 23, 161–167 (1981). https://doi.org/10.1007/BF02894877
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DOI: https://doi.org/10.1007/BF02894877