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Abstract
The study was to identify the potential tolerance of Crotalaria juncea to diclosulam uptake and translocation and its effects on the physiological metabolism of plants. Two experiments were carried out; I—Evaluation of uptake and translocation of 14C-diclosulam (35 g a.i. ha−1) in C. juncea, at seven and 14 days after emergence. II—Evaluation of chlorophyll a transient fluorescence of dark-adapted C. juncea leaves when applied diclosulam in pre-emergence. Plants of C. juncea presented an anatomical/metabolic barrier to diclosulam translocation in the stem, which may confer tolerance to this herbicidal, besides reduced translocation due to low accumulation in the cotyledons. In addition, plants can maintain photosynthetic metabolism active when growing in soil with diclosulam by not changing the dynamics of energy dissipation. Thus, when cultivated in soil with residual of diclosulam, C. juncea can tolerate the herbicide to maintain plant growth.
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1 Department of Plant Science, Federal Rural University of Rio de Janeiro, Seropédica, RJ, Brazil
2 Center of Nuclear Energy in Agriculture, University of São Paulo, Piracicaba, SP, Brazil
3 Department of Natural Resources and Environmental Protection, Federal University of São Carlos, Araras, SP, Brazil