Water use efficiency and photosynthesis of glyphosate-resistant soybean as affected by glyphosate

Zobiole, Luiz Henrique Saes; Oliveira, Rubem Silvério de; Kremer, Robert J.; Constantin, Jamil; Bonato, Carlos Moacir; Muniz, Antônio Saraiva

doi:10.1016/j.pestbp.2010.01.004

Cited by 74 publications

(69 citation statements)

References 49 publications

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“…Linear regression for the variable dry mass of seedlings, assessed in seedling of RR transgenic soybean, cultivar CD 219RR, as a function of application of different doses of glyphosate. Zobiole et al 2009;Zobiole et al 2010a;Zobiole et al 2010b). Results herein obtained, however, corroborate the synthesis of research works analyzed by Albrecht and Ávila (2010), who have stressed the perceptible and signifi cant infl uences of post-emergence application of glyphosate on RR transgenic soybean cultivars.…”

supporting

confidence: 88%

“…The negative effects, characterized by seed physiological quality, are probably related to potential of damage, or deleterious action of glyphosate, as found in the pertaining literature (Reddy et al 2004;Gordon, 2006;huber, 2007; It is known that also RR soybean plants may keep the residues of AMPA, which is a phytotoxic sub-product from glyphosate degradation (Reddy et al, 2004), that accumulate in the seeds (Duke et al, 2003). The increase in the glyphosate dose can lead to elevation of AMPA content, thus enhancing the phytotoxic effect of such metabolite (Reddy et al, 2004) that besides other plant physiological changes (Zobiole et al, 2010b) can directly affect soybean crop performance.…”

mentioning

confidence: 98%

“…Results herein obtained, however, corroborate the synthesis of research works analyzed by Albrecht and Ávila (2010), who have stressed the perceptible and signifi cant infl uences of post-emergence application of glyphosate on RR transgenic soybean cultivars. The glyphosate can cause stress even on RR transgenic soybean plants for which it should be selective, i.e., should not have herbicide effect, but can have phytotoxic action affecting the effi ciency in the water use, the photosynthesis, and the nutritional balance (Zobiole et al 2010a;Zobiole et al, 2010b;Zobiole et al 2009;Albrecht and Ávila, 2010). Any stress induces negative effect on normal growth and on development of plant species (Taiz and Zeiger, 2009).…”

mentioning

confidence: 99%

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RR soybean seed quality after application of glyphosate in different stages of crop development

Albrecht

Barbosa

Silva

et al. 2012

Rev. bras. sementes

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-In consequence of several studies and speculations concerning the issue of RR transgenic soybean after the application of glyphosate, additional scientific investigations became necessary to clarify the actual viability of the product use when applied in different developmental stages of the soybean crop. Therefore, this study was aimed to evaluate the physiological quality as well as seed health quality of RR soybean subjected to application of the herbicide glyphosate in different phonological stages of the transgenic soybean, cultivar CD 219RR. For this, an experiment with a complete block experimental design with treatments randomly distributed within the block, with four replications, was carried out. The assessed treatments were foliar sprayings of glyphosate in three increasing dosages [0 (control); 1,440 g ha -1 ; and 2,880 g ha -1 ] of acid equivalent, applied in two crop developmental stages: vegetative (V6) and reproductive (R2). The variables assessed were: germination; first count of germination; fresh and dry mass of seedlings, lengths of seedling and root; vigor and viability by the tetrazolium test; and seed health quality. Glyphosate application may adversely affect physiological quality of RR soybean seeds, when applied in dosages varying from 1,440 to 2,880 g acid equivalent per hectare at the stages V6 and R2.Index terms: Glycine max, transgenic seed, performance, herbicide.Qualidade das sementes de soja RR após aplicação de glyphosate em diferentes estádios de desenvolvimento da cultura RESUMO -Em virtude de estudos e especulações envolvendo a questão da soja transgênica (RR) após a aplicação de glyphosate, se fez necessário a busca de informações científicas que permitam diagnosticar a real viabilidade do uso do glyphosate aplicado em diferentes estádios fenológicos da cultura. Deste modo, o objetivo deste estudo foi avaliar a qualidade fisiológica e sanitária das sementes de soja RR após a aplicação do herbicida glyphosate na cultura da soja transgênica, cultivar CD 219RR. Para tanto, foi desenvolvido um ensaio em delineamento de blocos completos com tratamentos casualizados, com quatro repetições, em que os tratamentos avaliados consistiram da pulverização foliar contendo glyphosate, em três doses crescentes (0, 1.440 e 2.880 g de equivalente ácido por hectare), aplicados em dois estádios de desenvolvimento da cultura: vegetativo V6 e reprodutivo R2. As variáveis avaliadas foram: germinação; primeira contagem de germinação; massa fresca e seca de plântulas; comprimento de plântulas e raízes; viabilidade e vigor, pelo teste de tetrazólio; e qualidade sanitária das sementes. A aplicação de glyphosate pode afetar negativamente a qualidade fisiológica das sementes de soja, quando aplicado em doses de 1.440 a 2.880 g do equivalente ácido do produto por hectare, nos estágios fenológicos: vegetativo V6 e reprodutivo R2 .Termos para indexação: Glycine max, semente transgênica, desempenho, herbicida.1

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supporting

confidence: 88%

mentioning

confidence: 98%

mentioning

confidence: 99%

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RR soybean seed quality after application of glyphosate in different stages of crop development

Albrecht

Barbosa

Silva

et al. 2012

Rev. bras. sementes

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“…Portanto, independentemente de as doses serem aplicadas no reprodutivo ou no vegetativo (V 6 ), a elevação nas doses de glyphosate diminuiu o número de vagens por planta, altamente correlacionada com a produtividade. Tal fato pode estar associado à diminuição na retenção de vagens, devido a problemas nutricionais (Zobiole et al, 2010e), na fotossíntese e no uso da água (Zobiole et al, 2010b).…”

Section: Resultsunclassified

“…Outra causa poderia ser um menor aporte de nitrogênio via fixação biológica, que pode ser afetado por aplicações com glyphosate (Zablotowicz & Reddy, 2004;María et al, 2006;Santos et al, 2007a,b;Dvoranen et al, 2008;Zobiole et al, 2010a).…”

Section: Resultsunclassified

Desempenho da soja roundup ready sob aplicação de glyphosate em diferentes estádios

Albrecht

Barbosa²,

Silva³

et al. 2011

Planta daninha

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RESUMO -Em razão de estudos e especulações envolvendo a questão da soja RR sob aplicação de glyphosate, são necessárias investigações que permitam esclarecer melhor essa situação. O presente trabalho teve por objetivo avaliar o desempenho agronômico e os teores de óleo e proteínas sob aplicação do herbicida glyphosate na cultura da soja transgênica. Para isso, foi desenvolvido um ensaio em delineamento em blocos casualizados, com quatro repetições, em que os tratamentos avaliados consistiram da pulverização foliar contendo glyphosate, em doses crescentes, aplicadas nos estádios V 6 e R 2 . As variáveis avaliadas foram: altura média das plantas, número de vagens por planta, massa de mil grãos e produtividade, assim como os teores de óleo e proteínas. Verificou-se que o glyphosate, especialmente quando usado em R 2 , pode comprometer o desempenho agronômico e os teores de proteínas.Palavras-chave: Glycine max, herbicida, produção.ABSTRACT -Previous studies and speculation involving the behavior of Roundup Ready soybean under glyphosate application requires further investigations to clarify this issue. This study aimed to evaluate the agronomic performance and oil and protein contents of transgenic soybean culture under glyphosate application. Thus, an assay was carried out in a completely randomized block design, with four replications. Treatments consisted of foliar sprays in increasing doses of glyphosate applied at stages V6 and R2. The variables evaluated were: plant height, number of pods per plant, thousand grain weight and yield, as well as oil and protein contents. It was verified that glyphosate, especially when used in R2, can compromise both the agronomic performance and protein contents.

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Glyphosate effects on photosynthesis, nutrient accumulation, and nodulation in glyphosate‐resistant soybean

Zobiole

Kremer

Oliveira

et al. 2012

Z. Pflanzenernähr. Bodenk.

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110

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Previous greenhouse studies have demonstrated that photosynthesis in some cultivars of first-(GR1) and second-generation (GR2) glyphosate-resistant soybean was reduced by glyphosate. The reduction in photosynthesis that resulted from glyphosate might affect nutrient uptake and lead to lower plant biomass production and ultimately reduced grain yield. Therefore, a field study was conducted to determine if glyphosate-induced damage to soybean (Glycine max L. Merr. cv. Asgrow AG3539) plants observed under controlled greenhouse conditions might occur in the field environment. The present study evaluated photosynthetic rate, nutrient accumulation, nodulation, and biomass production of GR2 soybean receiving different rates of glyphosate (0, 800, 1200, 2400 g a.e. ha -1 ) applied at V2, V4, and V6 growth stages. In general, plant damage observed in the field study was similar to that in previous greenhouse studies. Increasing glyphosate rates and applications at later growth stages decreased nutrient accumulation, nodulation, leaf area, and shoot biomass production. Thus, to reduce potential undesirable effects of glyphosate on plant growth, application of the lowest glyphosate rate for weed-control efficacy at early growth stages (V2 to V4) is suggested as an advantageous practice within current weed control in GR soybean for optimal crop productivity. : Aminomethylphosphonic acid, a metabolite of glyphosate, causes injury in glyphosate-treated, glyphosate-resistant soybean.

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Water use efficiency and photosynthesis of glyphosate-resistant soybean as affected by glyphosate

Cited by 74 publications

References 49 publications

RR soybean seed quality after application of glyphosate in different stages of crop development

RR soybean seed quality after application of glyphosate in different stages of crop development

Desempenho da soja roundup ready sob aplicação de glyphosate em diferentes estádios

Glyphosate effects on photosynthesis, nutrient accumulation, and nodulation in glyphosate‐resistant soybean

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