Sensitivity of imidazolinone-resistant red rice (Oryza sativa L.) to glyphosate and glufosinate

Cassol, G.V.; Avila, Luis Antônio de; Zemolin, C.R.; Piveta, Andrey; Agostinetto, Dirceu; Júnior, Aldo Merotto

doi:10.1590/0103-8478cr20140896

Cited by 9 publications

(11 citation statements)

References 12 publications

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“…The R-WR was 50-to 67-fold more resistant to OnDuty ® than S-WR, confirming that the sampled weedy rice was resistant to imidazolinone herbicides. Cases like this have been reported in other countries adopting the technology such as in Rio Grande do Sul, Brazil where the same premix is used (Cassol et al, 2015). In their location, the resistance level among weedy rice outcrosses was generally low, ranging from 3.5 to 4.5.…”

Section: Confirmation Of Imidazolinone-resistant Weedy Ricesupporting

confidence: 59%

Cross-Resistance to Imazapic and Imazapyr in a Weedy Rice (Oryza sativa) Biotype Found in Malaysia

et al. 2018

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Planta Daninha 2018; v36:e018182239 DILIPKUMAR, M. et al. Cross-resistance to imazapic and imazapyr in a weedy rice (Oryza sativa) biotype found in Malaysia 1 151103-PD-2016 (9 páginas) PROVA GRÁFICA 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 GR 50 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. Keywords:Clearfield ® system, imidazolinone-resistance, direct-seeded rice, ALS-inhibitor herbicide, ACCase-inhibitor herbicide. RESUMO -O sistema de produção de arroz

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Section: Confirmation Of Imidazolinone-resistant Weedy Ricesupporting

confidence: 59%

Cross-Resistance to Imazapic and Imazapyr in a Weedy Rice (Oryza sativa) Biotype Found in Malaysia

et al. 2018

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“…In whole-plant dose response, all weedy rice populations expressed low resistance level towards IMI-herbicides. These results were identical with the whole-plant dose response experiment conducted in another IMI-herbicides adopting country Brazil, where low resistance level was reported in their weedy rice populations treated with similar IMI-herbicides premix of imazapic+imazapyr (weedy rice RI index ranged from 3.5 to 4.5) [28]. Interestingly, population C had a different resistance pattern than the other resistant weedy rice populations and rice varieties at whole-plant level.…”

Section: Discussionsupporting

confidence: 84%

Ser-653-Asn substitution in the acetohydroxyacid synthase gene confers resistance in weedy rice to imidazolinone herbicides imazapic and imazapyr in Malaysia

Ruzmi

Ahmad-Hamdani

Mazlan

2019

Preprint

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The IMI-herbicides rice package has been recognized by all means among the most efficient chemical approaches for weedy rice control nowadays. Inevitably, the continuous and sole dependence, as well as ignorance on the appropriate use of imidazolinone herbicides in the IMI-herbicides rice package by rice growers has caused the development of herbicide resistance in weedy rice populations across many IMI-herbicides rice package adopted countries, inclusive of Malaysia. Hence, a comprehensive study was conducted to elucidate the occurrence, level, and mechanisms endowing resistance to IMI-herbicides on field-reported resistant (R) weedy rice populations collected from IMI-rice fields in Kampung Simpang Sanglang, Perlis (A), Kampung Behor Mentalon, Perlis (B), and Kampung Sungai Kering, Kedah (C). The collected weedy rice populations were compared with a susceptible weedy rice population (S), an imidazolinone-resistant rice cultivar (IMI-rice), and a susceptible local rice cultivar (MR219). Dose-response experiments were carried out using commercial IMI-herbicides (premix of imazapic and imazapyr) available in the IMI-herbicides rice package, in the seed bioassay and whole-plant dose-response. Based on the Resistance Index (RI) quantification in both experiments, the cross-resistance pattern of weedy rice populations and rice varieties to imazapic and imazapyr was determined. Molecular investigation was carried out by comparing acetohydroxyacid synthase (AHAS) gene sequences between resistant (R) weedy rice populations (A, B, and C), S population, IMI-rice, and MR219. Evidently, the AHAS gene sequences of R weedy rice were identical to the IMI-rice, revealing that amino acid substitution of Ser-653-Asn occurs in both R populations and IMI-rice, but neither in MR219 nor S plants. In vitro assays were conducted using analytical grade imidazolinone herbicides of imazapic (99.3%) and imazapyr (99.6%) with seven concentrations. The results demonstrated that the AHAS enzyme extracted from R populations and IMI-rice were less sensitive to IMI-herbicides in comparison to S and MR219, further supporting the IMI-herbicides resistance was conferred by target site mutation. In conclusion, the basis of imidazolinone resistance in selected populations of Malaysia weedy rice was due to a Ser-653-Asn mutation that reduced sensitivity of the target site to IMI-herbicides. The current study presents the first report of resistance mechanism in weedy rice in Malaysian rice fields.

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“…A exposição da cultura do arroz ao glyphosate em estádios de crescimento inicial dificulta o rebrote e recuperação dos danos do herbicida (CASSOL et al, 2015). Além disso, plantas jovens expostas ao glyphosate são mais sensíveis à deriva do que plantas mais desenvolvidas, pois a translocação do herbicida é maior no período vegetativo (BOND et al, 2006;FRANCO et al, 2012).…”

Section: Resultsunclassified

A deriva de glyphosate interfere no desenvolvimento e produtividade de arroz irrigado

et al. 2019

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Objetivo do trabalho foi avaliar os danos ao desenvolvimento e produtividade de cultivar de arroz irrigado de ciclo precoce (IRGA 430), ocasionados por deriva simulada de glyphosate. O experimento foi realizado a campo na Estação Experimental do Arroz – IRGA na safra 2016/17 e os tratamentos foram arranjados em esquema fatorial 3x2+1 cujo fator A constou da simulação de deriva de glyphosate nas doses de 135; 270 e 540g ha-1 e.a.; o fator B de duas doses de nitrogênio (N), sendo eles 90 e 121,5 kg ha-1 de N; mais testemunha sem aplicação de glyphosate e com aplicação de 90kg ha-1 de N. O aumento na dose de glyphosate resultou em maiores danos à cultura, como sintomas de fitotoxicidade, redução no número de panículas por área e no rendimento de grãos que foi de aproximadamente 60% na maior dose estudada. De acordo com o aumento da dose de glyphosate também ocorreu o prolongamento no número de dias entre a emergência da cultura até o estágio de desenvolvimento de antese (R4). A deriva simulada de glyphosate evidencia que o herbicida causa elevada fitotoxicidade a cultura, menor estatura as plantas e aumento do ciclo de desenvolvimento, interferindo negativamente na produtividade da cultura do arroz irrigado.

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Sensitivity of imidazolinone-resistant red rice (Oryza sativa L.) to glyphosate and glufosinate

Abstract: Sensitivity of imidazolinone-resistant red rice (Oryza sativa L.) to glyphosate and glufosinate.Ciência Rural, v.45, n.9, set, 2015.

Cited by 9 publications

References 12 publications

Cross-Resistance to Imazapic and Imazapyr in a Weedy Rice (Oryza sativa) Biotype Found in Malaysia

Cross-Resistance to Imazapic and Imazapyr in a Weedy Rice (Oryza sativa) Biotype Found in Malaysia

Ser-653-Asn substitution in the acetohydroxyacid synthase gene confers resistance in weedy rice to imidazolinone herbicides imazapic and imazapyr in Malaysia

A deriva de glyphosate interfere no desenvolvimento e produtividade de arroz irrigado

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