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Imidazolinone-Tolerant Rice Response to Imazethapyr Application

Published online by Cambridge University Press:  20 January 2017

Ronald J. Levy JR. ,
Jason A. Bond ,
Eric P. Webster ,
James L. Griffin ,
Wei P. Zhang  and
Steven D. Linscombe
Ronald J. Levy JR.
Affiliation:
LSU AgCenter, Cooperative Extension Service, 157 Cherokee Drive, Crowley, LA 70526
Jason A. Bond*
Affiliation:
Louisiana State University (LSU) AgCenter, Rice Research Station, 1373 Caffey Road, Rayne, LA 70578
Eric P. Webster
Affiliation:
LSU AgCenter, Department of Agronomy and Environmental Management, LSU AgCenter, 104 Sturgis Hall, Baton Rouge, LA 70803
James L. Griffin
Affiliation:
LSU AgCenter, Department of Agronomy and Environmental Management, LSU AgCenter, 104 Sturgis Hall, Baton Rouge, LA 70803
Wei P. Zhang
Affiliation:
LSU AgCenter, Department of Agronomy and Environmental Management, LSU AgCenter, 104 Sturgis Hall, Baton Rouge, LA 70803
Steven D. Linscombe
Affiliation:
LSU AgCenter, Rice Research Station, 1373 Caffey Road, Rayne, LA 70578
*
Corresponding author's E-mail: [email protected]
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Abstract

Greenhouse research was conducted to evaluate shoot and root growth response of imidazolinone-tolerant (IT) rice cultivars to imazethapyr applied postemergence at various rates and application timings. Imazethapyr was applied at 70, 140, and 280 g ai/ha to IT cultivars ‘CL 121’ and ‘CL 161’ in the one- to two-leaf and three- to four-leaf growth stages. Imazethapyr applied to one- to two-leaf or three- to four-leaf rice at 70, 140, and 280 g/ha was more injurious to CL 121 than to CL 161. At 3 wk after treatment (WAT), CL 121 was injured 23 to 38% regardless of application timing. In contrast, CL 161 was injured no more than 11% at 3 WAT. Shoot:root ratio for CL 161 was not affected by imazethapyr application. For CL 121, shoot:root ratio was lower following imazethapyr at 280 g/ha than at 70 or 140 g/ha. Based on shoot fresh weight following imazethapyr at 70 g/ha, CL 161 was 1.8 times more tolerant than CL 121 at 2 WAT and 1.3 times more tolerant at 3 WAT. The IT rice cultivar CL 161 is inherently more tolerant to imazethapyr than is CL 121 based on visual injury and shoot and root growth.

Keywords

Imazethapyrrice, Oryza sativa L. ‘CL 121’, ‘CL 161’Application timingrice injuryshoot:root ratioALS, acetolactate synthaseIT, imidazolinone-tolerantWAT, weeks after treatment
Type
Research Article
Information
Weed Technology , Volume 20 , Issue 2 , June 2006 , pp. 389 - 393
Copyright
Copyright © Weed Science Society of America 

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Footnotes

1 Published with the approval of the Director of the Agricultural Experiment Station, Louisiana State University AgCenter, manuscript 05-61-0493.

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