Biótipos de arroz vermelho (Oryza sativa) com resistência cruzada a imazapic e imazapyr encontrados na Malásia

Translated title of the contribution: Cross-resistance to imazapic and imazapyr in a weedy rice (Oryza sativa) biotype found in Malaysia

M. Dilipkumar, N. R. Burgos, T. S. Chuah, Ismail Sahid

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

The Clearfield® rice production system is an effective management tool for weedy rice and other weeds in the direct-seeded rice culture. However, if farmers cultivating the Clearfield® rice disregard stewardship recommendations, the industry could face a problem of herbicide-resistant weedy rice which would occur through the selection of outcrosses. This study aimed to confirm imidazolinoneresistant weedy rice in Malaysia. The resistant weedy rice (R-WR) was found to be 67 fold more resistant to OnDuty® (premix of imazapic and imazapyr) than the susceptible weedy rice (S-WR) based on the GR50 values (rate that causes 50% inhibition of shoot growth). The Clearfield® rice cultivar was 32-fold more tolerant to OnDuty® than the S-WR. Furthermore, the R-WR was 54 and 89 fold more resistant to imazapic and imazapyr applied separately than the S-WR, respectively. The Clearfield® rice was 140- and 40-fold more tolerant to imazapic and imazapyr, respectively than the S-WR. The R-WR biotype was susceptible to non-selective herbicides glyphosate and glufosinate, as well as the selective graminicide quizalofop. Oxadiazon controlled the R-WR biotype, but pretilachlor was ineffective. The present study documented the first case of weedy rice that was cross-resistant to imazapic and imazapyr in Malaysian Clearfield® rice field.

Original languagePortuguese
Article numbere018182239
JournalPlanta Daninha
Volume36
DOIs
Publication statusPublished - 1 Jan 2018

Fingerprint

imazapic
imazapyr
cross resistance
Malaysia
biotypes
Oryza sativa
rice
glyphosate
Herbicides
Oryza
Industry
herbicides
pretilachlor
oxadiazon
quizalofop
glufosinate

Keywords

  • ACCase-inhibitor herbicide
  • ALS-inhibitor herbicide
  • Clearfield® system
  • Direct-seeded rice
  • Imidazolinone-resistance

ASJC Scopus subject areas

  • Biochemistry
  • Physiology
  • Agronomy and Crop Science
  • Plant Science

Cite this

Biótipos de arroz vermelho (Oryza sativa) com resistência cruzada a imazapic e imazapyr encontrados na Malásia. / Dilipkumar, M.; Burgos, N. R.; Chuah, T. S.; Sahid, Ismail.

In: Planta Daninha, Vol. 36, e018182239, 01.01.2018.

Research output: Contribution to journalArticle

Dilipkumar, M. ; Burgos, N. R. ; Chuah, T. S. ; Sahid, Ismail. / Biótipos de arroz vermelho (Oryza sativa) com resistência cruzada a imazapic e imazapyr encontrados na Malásia. In: Planta Daninha. 2018 ; Vol. 36.
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