1 November 2009 Absorption, Translocation, and Metabolism of Mesotrione in Grain Sorghum
M. Joy M. Abit, Kassim Al-Khatib
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Studies were conducted under controlled growth conditions to determine whether differential absorption, translocation, or metabolism was the basis for the differential response of grain sorghum hybrids to mesotrione. Mesotrione-tolerant (‘Dekalb DKS35-70’) and mesotrione-susceptible (‘Pioneer 84G62’) grain sorghum hybrids were treated with 14C-labeled mesotrione. At 1 d after treatment (DAT), absorption was 7% in both hybrids; at 7 DAT, however, absorption remained nearly steady in Pioneer 84G62 but increased to 12% in Dekalb DKS35-70. Translocation of 14C-mesotrione in sorghum hybrids was similar with less than 30% of the absorbed herbicide translocated out of the treated leaf by 7 DAT. A distinct metabolite of 14C-mesotrione was separated in both hybrids at 3 DAT. The amount of mesotrione parent compound that remained in Pioneer 84G62 and DKS35-70 was 72 and 65%, respectively. Dekalb DKS35-70 had significantly less mesotrione at 3 DAT than Pioneer 84G62 did, but the amount of mesotrione was similar for both hybrids at 5 and 7 DAT. Rapid metabolism of mesotrione may help explain the differential response of grain sorghum hybrids.

Nomenclature: Mesotrione; sorghum, Sorghum bicolor (L.) Moench. SORBI.

M. Joy M. Abit and Kassim Al-Khatib "Absorption, Translocation, and Metabolism of Mesotrione in Grain Sorghum," Weed Science 57(6), 563-566, (1 November 2009). https://doi.org/10.1614/WS-09-041.1
Received: 3 March 2009; Accepted: 1 June 2009; Published: 1 November 2009
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