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Glyphosate Tolerance in Enhanced Glyphosate-Resistant Cotton (Gossypium hirsutum)

  • Jonathan A. Huff (a1), Daniel B. Reynolds (a1), Darrin M. Dodds (a1) and J. Trenton Irby (a1)
Abstract

Glyphosate applied to glyphosate-resistant (RR) cotton varieties after the four-leaf stage can decrease boll retention resulting in severe yield reductions. Enhanced glyphosate-resistant cotton (RR Flex), released for commercial use in 2006, offers a wider window of glyphosate applications without the risk of yield loss. However, no data exist regarding the effect of glyphosate application, especially late season applications, on fruit partitioning in RR Flex cotton. The objective of this research was to determine the effect of glyphosate rate and application timing on RR Flex cotton yield and fruit partitioning compared with current RR cotton. Studies were conducted during a 3-yr period (2004 to 2006), throughout the cotton growing regions of Mississippi. Roundup Ready (ST 4892 Bollgard/Roundup Ready [BR]) and Roundup Ready Flex (Mon 171 Enhanced Roundup Ready and ST 4554 Bollgard II/Roundup Ready Flex [B2RF]) cotton was planted, and glyphosate was applied at various rates and cotton growth stages. Data were collected using box mapping, a technique designed to depict yield partitioning on a cotton plant. RR Flex cotton yields were unaffected by glyphosate application timing or rate. Yields for ST 4892 BR were affected by application timings after the sixth leaf. ST 4892 BR had increased yield partitioning to position-three bolls and upper nodes with later application timings of glyphosate. Increases in seed cotton partitioned to higher nodes and outer fruiting positions were unable to compensate for fruit shed from innermost, lower fruiting sites. These data indicate that RR Flex cotton has excellent tolerance to late-season glyphosate applications.

El glifosato aplicado a diferentes variedades de algodón resistentes al mismo (RR) después de la etapa de cuatro hojas puede disminuir la retención de bellotas provocando severas reducciones en el rendimiento. Una variedad mejorada de algodón resistente al glifosato (RR Flex) liberada al mercado para su uso comercial en 2006, ofrece mejores opciones en la aplicación del herbicida sin el riesgo de pérdida en el rendimiento. Sin embargo, no existe información acerca del efecto de la aplicación del glifosato, especialmente en aplicaciones tardías en la etapa de dehiscente de la bellota de algodón RR Flex. El objetivo de esta investigación fue determinar el efecto de la dosis de glifosato y el tiempo de aplicación en el rendimiento y en la dehiscencia de la bellota del algodón RR Flex, comparada con el algodón RR de uso común en la actualidad. Los estudios se llevaron al cabo durante un período de tres años (2004 a 2006), a lo largo de las regiones de cultivo de algodón en Mississippi. Se sembraron las variedades Roundup Ready (ST 4892 Bollgard/Roundup Ready [BR]) y Roundup Ready Flex (Mon 171 Enhanced Roundup Ready y ST 4554 Bollgard II/Roundup Ready Flex [B2RF]) y el glifosato se aplicó a diferentes dosis y etapas de crecimiento. La información fue obtenida usando “Box mapping” una técnica designada para representar la canalización del rendimiento en una planta de algodón. Los rendimientos del algodón RR Flex no se afectaron por el tiempo de aplicación o por la dosis. Los rendimientos para ST 4892 BR si se afectaron en respuesta al tiempo de aplicación después de la sexta hoja. El ST 4892 Bollgard/Roundup Ready (BR) Exhibió un mayor grado de canalización hacia las bellotas en la posición de tres bellotas y hacia los nódulos superiores debido al tiempo más tardío de la aplicación de glifosato. Los incrementos en la semilla de algodón canalizada hacia los nódulos superiores y hacia las posiciones periféricas de las bellotas no fueron suficientes para compensar la pérdida del fruto en las posiciones interiores e inferiores. Ésta información señala que el algodón RR Flex tiene una excelente tolerancia a las aplicaciones tardías de glifosato.

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Corresponding author
Corresponding author's E-mail: dreynolds@pss.msstate.edu.
References
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Weed Technology
  • ISSN: 0890-037X
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