Florpyrauxifen-Benzyl Selectivity to Rice

Juan Camilo Velásquez, Angela Das Cas Bundt, Edinalvo Rabaioli Camargo, André Andres, Vívian Ebeling Viana, Verónica Hoyos, Guido Plaza and Luis Antonio de Avila
Additional contact information
Juan Camilo Velásquez: Crop Protection Graduate Program (Programa de pós Gradução em Fitossanidade), Federal University of Pelotas, Pelotas 96160-000, Brazil
Angela Das Cas Bundt: AgriScience, Mogi Mirim 13800-000, Brazil
Edinalvo Rabaioli Camargo: Crop Protection Graduate Program (Programa de pós Gradução em Fitossanidade), Federal University of Pelotas, Pelotas 96160-000, Brazil
André Andres: Brazilian Agricultural Research Corporation (Embrapa), Cima Temperado Station, Pelotas 96010-971, Brazil
Vívian Ebeling Viana: Crop Protection Graduate Program (Programa de pós Gradução em Fitossanidade), Federal University of Pelotas, Pelotas 96160-000, Brazil
Verónica Hoyos: Facultad de Ingeniería, Universidad del Magdalena, Santa Marta 470004, Colombia
Guido Plaza: Departamento de Agronomía, Facultad de Ciencias Agrarias, Universidad Nacional de Colombia, Bogotá D.C. 111321, Colombia
Luis Antonio de Avila: Crop Protection Graduate Program (Programa de pós Gradução em Fitossanidade), Federal University of Pelotas, Pelotas 96160-000, Brazil

Agriculture, 2021, vol. 11, issue 12, 1-19

Abstract: Florpyrauxifen-benzyl (FPB) is a new class of auxinic herbicide developed for selective weed control in rice. This study aimed to evaluate the effect of environmental conditions, P450 inhibitors, rice cultivar response, and gene expression on FPB selectivity in rice. Field experiments established in a randomized block design showed that rice plant injury due to two FPB rates (30 and 60 g ai ha −1 ) was affected by planting time and rice stage at herbicide application. The injury was higher at the earliest planting season and more in younger plants (V 2 ) than larger (V 6 and R 0 ). However, no yield reduction was detected. Under greenhouse conditions, two dose-response experiments in a randomized block design showed that spraying malathion (1 kg ha −1 ) before FPB application did not reduce herbicide selectivity. The addition of two P450 inhibitors (dietholate and piperonyl butoxide, 10 g a.i. seed-kg −1 and 4.2 kg ai ha −1 , respectively) decreased the doses to cause 50% of plant injury (ED 50 ) and growth reduction (GR 50 ). However, it seems not to compromise crop selectivity. BRS Pampeira cultivar showed lower ED 50 and GR 50 than IRGA 424 RI. A growth chamber experiment was conducted in a completely randomized design to evaluate the gene expression of rice plants sprayed with FPB (30 and 60 g ai ha −1 ). Results showed downregulation of OsWAKL21.2 , an esterase probably related to bio-activation of FPB-ester. However, no effect was detected on CYP71A21 monooxygenase and OsGSTL transferase, enzymes probably related to FPB degradation. Further research should focus on understanding FBP bio-activation as the selective mechanism.

Keywords: herbicide tolerance; metabolism; Rinskor; Oryza sativa (search for similar items in EconPapers)
JEL-codes: Q1 Q10 Q11 Q12 Q13 Q14 Q15 Q16 Q17 Q18 (search for similar items in EconPapers)
Date: 2021
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (1)

Downloads: (external link)
https://www.mdpi.com/2077-0472/11/12/1270/pdf (application/pdf)
https://www.mdpi.com/2077-0472/11/12/1270/ (text/html)

Related works:
This item may be available elsewhere in EconPapers: Search for items with the same title.

Export reference: BibTeX RIS (EndNote, ProCite, RefMan) HTML/Text

Persistent link: https://EconPapers.repec.org/RePEc:gam:jagris:v:11:y:2021:i:12:p:1270-:d:702183

Access Statistics for this article

Agriculture is currently edited by Ms. Leda Xuan

More articles in Agriculture from MDPI
Bibliographic data for series maintained by MDPI Indexing Manager ().