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Absorption, Translocation, and Metabolism of 14C-Halosulfuron in Grafted Eggplant and Tomato

Published online by Cambridge University Press:  27 September 2017

Sushila Chaudhari*
Affiliation:
Postdoctoral Research Scholar and William Neal Reynolds Professor, Department of Crop and Soil Sciences, North Carolina State University, Raleigh, NC 27695
Katherine M. Jennings
Affiliation:
Associate Professor, Associate Director of North Carolina Agricultural Research Service, and Associate Professor, Department of Horticultural Science, North Carolina State University, Raleigh, NC 27695
David W. Monks
Affiliation:
Associate Professor, Associate Director of North Carolina Agricultural Research Service, and Associate Professor, Department of Horticultural Science, North Carolina State University, Raleigh, NC 27695
David L. Jordan
Affiliation:
Postdoctoral Research Scholar and William Neal Reynolds Professor, Department of Crop and Soil Sciences, North Carolina State University, Raleigh, NC 27695
Christopher C. Gunter
Affiliation:
Associate Professor, Associate Director of North Carolina Agricultural Research Service, and Associate Professor, Department of Horticultural Science, North Carolina State University, Raleigh, NC 27695
Frank J. Louws
Affiliation:
Professor, Department of Entomology and Plant Pathologyand Director ofNSF-Center for Integrated Pest Management, North Carolina State University, Raleigh, NC 27695
*
*Corresponding author’s E-mail: schaudh@ncsu.edu

Abstract

Grafted plants are a combination of two different interspecific or intraspecific scion and rootstock. Determination of herbicidal selectivity of the grafted plant is critical given their increased use in vegetable production. Differential absorption, translocation, and metabolism play an important role in herbicide selectivity of plant species because these processes affect the herbicide amount delivered to the site of action. Therefore, experiments were conducted to determine absorption, translocation, and metabolism of halosulfuron in grafted and non-grafted tomato and eggplant. Transplant type included non-grafted tomato cultivar Amelia, non-grafted eggplant cultivar Santana, Amelia scion grafted onto Maxifort tomato rootstock (A-Maxifort) and Santana scion grafted onto Maxifort rootstock (S-Maxifort). Plants were treated POST with commercially formulated halosulfuron at 39 g ai ha-1 followed by 14C-halosulfuron under controlled laboratory conditions. Amount of 14C-halosufuron was quantified in leaf wash, treated leaf, scion shoot, rootstock shoot, and root at 6, 12, 24, 48, and 96 h after treatment (HAT) using liquid scintillation spectrometry. No differences were observed between transplant types with regard to absorption and translocation of 14C-halosulfuron. Absorption of 14C-halosulfuron increased with time, reaching 10 and 74% of applied at 6 and 96 HAT, respectively. Translocation of 14C-halosulfuron was limited to the treated leaf, which reached maximum (66% of applied) at 96 HAT, whereas minimal (<4% of applied) translocation occurred in scion shoot, rootstock shoot, and root. Tomato plants metabolized halosulfuron faster compared to eggplant regardless of grafting. Of the total amount of 14C-halosulfuron absorbed into the plant, 9 to 14% remained in the form of the parent compound in tomato compared with 25 to 26% in eggplant at 48 HAT. These results indicate that grafting did not affect absorption, translocation, and metabolism of POST halosulfuron in tomato and eggplant.

Type
Weed Management-Other Crops/Areas
Copyright
© Weed Science Society of America, 2017 

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Footnotes

Associate Editor for this paper: Steve Fennimore, University of California, Davis.

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