Inheritance Study of Resistance to the Herbicide Quizalofop-P-Ethyl in Rice and Development of Provisia Hybrid Rice Germplasm

Author

Jose Roberto Camacho Montero, Louisiana State University and Agricultural and Mechanical CollegeFollow

Degree

Doctor of Philosophy (PhD)

Department

School of Plant, Environmental and Soil Sciences

Document Type

Dissertation

Abstract

In 2017, Provisia^TM quizalofop-p-ethyl (QFE) resistant rice became a new alternative for the chemical control of in-season red rice (Oryza sativa L. sp. spontaneum) infestations in Louisiana rice farms. Until then, Clearfield^® imidazolinone resistant rice was the only alternative that US farmers had for the efficient in-season chemical control of red rice. Provisia^TM rice is a BASF Corporation patented technology that can serve as an alternative for rotation with Clearfield^® rice. This strategy seeks to prevent outcrosses between red rice and herbicide resistant varieties, and consequently extend the life span of both technologies. This research aimed to dissect the inheritance of the resistance to QFE in Provisia^TM rice as a first step for incorporation into the LSU AgCenter hybrid rice germplasm. This inheritance study demonstrated that the trait is governed by a single dominant gene that segregates following a Mendelian fashion with no maternal cytoplasmic effects. Additionally, SNP-based markers which properly tagged the QFE resistance were developed. QFE resistance was transferred to Environmental Genic Male Sterile (EGMS) lines using different crossing strategies. The objective was to develop QFE resistant EGMS lines adapted to local growing conditions and the cereal chemistry profile of US long grain varieties. During the 2016 growing season, a total 211 QFE resistant EGMS were selected for future evaluation. These were in the F_3:4, F_4:5 and F_5:6 generations representing different crosses with different cereal chemistry profiles inherited from the parents utilized. A subset of these lines were used to develop and evaluate 42 new QFE-resistant hybrids during the 2016 summer season and 143 QFE resistant hybrids during 2017. Experimental hybrids were identified that combined QFE herbicide resistance with levels of heterosis comparable to commercial hybrid varieties.

Date

9-21-2017

Recommended Citation

Camacho Montero, Jose Roberto, "Inheritance Study of Resistance to the Herbicide Quizalofop-P-Ethyl in Rice and Development of Provisia Hybrid Rice Germplasm" (2017). LSU Doctoral Dissertations. 4110.
https://repository.lsu.edu/gradschool_dissertations/4110

Committee Chair

Oard, James H

DOI

10.31390/gradschool_dissertations.4110