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Inheritance of resistance and response of Provisia™ rice to quizalofop-p-ethyl under U.S. field conditions

  • Jose R. Camacho (a1), Steve D. Linscombe (a2), Eric P. Webster (a3) and James H. Oard (a4)

Abstract

Provisia™ rice was developed recently by the BASF Corporation for control of grass weeds and is complementary to existing Clearfield® technology. Our previous research showed that resistance of Provisia™ rice to the acetyl coenzyme-A carboxylase herbicide quizalofop-p-ethyl (QPE) in laboratory and greenhouse environments is governed by a single dominant Mendelian gene. However, these results may not be consistent in different populations or field environments. Therefore, the first objective of the current research is to determine the inheritance of resistance to QPE in rice using different segregating populations evaluated under U.S. field environments. The second objective is to evaluate the response of QPE-resistant breeding lines to various herbicide concentrations at two U.S. locations. Chi-square tests of 12 F2 populations evaluated in Louisiana during 2014 and 2015 indicated that QPE seedling resistance at 240 g ai ha−1 was governed by a single dominant Mendelian gene with no observable maternal effects. Similar results were obtained in five F3 populations derived from the aforementioned F2 populations. Allele-specific SNP markers for QPE resistance also followed Mendelian segregation in the five F2 populations. For the second objective, six QPE-resistant inbred lines showed transient leaf injury at 1× (120 g ai ha−1) or 2× (240 g ai ha−1) field rates 7 and 21 d after treatment (DAT). However, a trend of reduced injury (recovery) from 7 through 33 DAT was observed for all breeding material. No differences in grain yield were found between untreated QPE-resistant lines and those treated with 1× or 2× QPE field rate. Single gene inheritance and good levels of QPE herbicide field resistance in different genetic populations suggest feasibility for rapid and effective development of new QPE-resistant varieties and effective stewardship of the Provisia™ technology.

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Corresponding author

Author for correspondence: Jose R. Camacho, H. Rouse Caffey Rice Research Station, Louisiana State University Agricultural Center, 1373 Caffey Road, Rayne, LA70578. Email: roberto.camacho1986@gmail.com

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Associate Editor: David Johnson, Corteva Agriscience

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References

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Keywords

Inheritance of resistance and response of Provisia™ rice to quizalofop-p-ethyl under U.S. field conditions

  • Jose R. Camacho (a1), Steve D. Linscombe (a2), Eric P. Webster (a3) and James H. Oard (a4)

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