Responses in root growth, nitrogen metabolism and nutritional quality in Brachiaria with the use of thiamethoxam

Macedo, Willian Rodrigues; Fernandes, Gisele Machado; Possenti, Rosana Aparecida; Lambais, George Rodrigues; Castro, Paulo Roberto de Camargo e

doi:10.1007/s11738-012-1064-1

Cited by 22 publications

(19 citation statements)

References 24 publications

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“…It is then significant that the growth stimulatory effects of TMX on several plants (Cataneo et al 2010;Macedo and Castro 2011;Perelló and Dal Bello 2011;Almeida et al 2012;Macedo et al 2013b;Almeida et al 2014) are to some extent comparable to the growth stimulatory effects of SA (Gutiérrez-Coronado et al 1998;Shakirova et al 2003;Gunes et al 2007;RivasSan Vicente and Plasencia 2011). Given that both the SAand JA signaling pathways are repressed under FR-E light (Cerrudo et al 2012, de Wit et al 2013, one would expect that the TMX treatment at least in part derepress the SA signaling pathway.…”

Section: Discussionmentioning

confidence: 99%

Changes in light quality alter physiological responses of soybean to thiamethoxam

Kim

Amirsadeghi

McKenzie‐Gopsill

et al. 2016

Planta

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The interaction between neighboring weed-induced far-red enriched light and thiamethoxam can significantly alter soybean seedling morphology, nodulation, isoflavone levels, UV-absorbing phenolics, and carbon and nitrogen content. Neonicotinoid insecticides that are widely used on major crop plants can enhance plant growth and yield. Although the underlying mechanism of this enhanced growth and yield is not clear, recent studies suggest that neonicotinoids such as thiamethoxam (TMX) may exert their effects at least in part via signals that involve salicylic acid (SA) and jasmonic acid (JA). In the current research, effects of TMX on morphological and physiological responses of soybean have been compared under far-red-depleted (FR-D) and far-red-enriched (FR-E) light reflected by neighboring weeds. TMX significantly enhanced shoot and root growth but did not prevent stem elongation under FR-E light. Also, TMX did not prevent reductions in shoot carbon content and shoot carbon to nitrogen ratio under FR-E light. Despite similarities between these TMX effects in soybean and those known for SA and JA in other plant species, TMX significantly enhanced root-nodule numbers per plant and levels of root isoflavones malonyl-daidzin and malonyl-genistin under FR-E light only. These results suggest that the combined effect of FR-E light and TMX triggers a mechanism that operates concomitantly to enhance root isoflavones and nodulation in soybean.

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Section: Discussionmentioning

confidence: 99%

Changes in light quality alter physiological responses of soybean to thiamethoxam

Kim

Amirsadeghi

McKenzie‐Gopsill

et al. 2016

Planta

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“…Em experimentos com trigo, braquiária e arroz, foi observado que plantas submetidas ao TMX apresentaram alterações consistentes no metabolismo do nitrogênio Castro, 2011;Macedo et al, 2013a;Macedo et al, 2013b), principalmente na atividade da nitrate reductase, de modo que a maior assimilação desse nutriente favorece a síntese de aminoácidos (Heldt;Piechulla, 2011) os quais agem diretamente na síntese do anel porfirínico, o principal constituinte mineral das clorofilas a e b (Schoefs;Bertrand, 2005), ponderamos que essa rota metabólica seja a chave para compreensão do incremento desses pigmentos pelo uso do TMX.…”

Section: Essaunclassified

“…Recentemente têm se reportado sobre potenciais efeitos fisiológicos de alguns inseticidas em diversos cultivos, sendo que essas moléculas modificam o metabolismo e influenciam o desenvolvimento e rendimento, quando o agroquímico apresenta essa atividade pode ser classificado como bioativador Castro, 2011;Macedo et al, 2013a;Macedo et al, 2013b), com destaque para o thiamethoxam (TMX), um inseticida sistêmico do grupo dos neonicotinoides.…”

Section: Introductionunclassified

Thiamethoxam Altera O Conteúdo De Pigmentos Fotossintetizantes E Biomassa De Milho: Análise Em Casa-De-Vegetação E No Campo

Macedo

Castro²

2018

Rev. Cien. Agr.

Self Cite

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O tratamento de sementes com agroquímicos é uma prática que confere maior proteção à plântulas contra pragas e doenças, no entanto poucas pesquisas são conduzidas para avaliar o efeito fisiológico desses produtos sobre a cultura do milho. Nosso estudo objetivou determinar o efeito de doses crescentes: 0; 17,5; 35; 52,5 e 70 g ingrediente ativo i.a. de thiamethoxam, via tratamento de sementes, em ambiente controlado e em campo de produção. Observamos que doses crescentes do thiamethoxam alteram o conteúdo de pigmentos foliares fotossinteticamente ativos, nas duas condições experimentais, bem como promoveu o ganho na massa seca da parte aérea das plantas crescidas em casa-de-vegetação, porém não foram observadas diferenças nos índices produtivos em campo de produção. Estes resultados indicam que o produto em questão altera o metabolismo vegetal, porém é necessário confirmar o efeito bioativador na cultura do milho.

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“…The Brachiaria genus originated in Africa and has resistance to acid soils and low fertility [19], allowing it to easily spread by seed and to be highly competitive with weeds [20], which explains the expansion of this type of grass to tropical and subtropical regions of the world [21]. However, cultivated species currently belonging to these genera demand large amounts of fertiliser to persist in the field and to compete with the native species of each region.…”

Section: Biodiversity In Ecosystems -Linking Structure and Functionmentioning

confidence: 99%

Shortage of Biodiversity in Grassland

Edvan¹,

Bezerra²,

Marques³

2015

Biodiversity in Ecosystems - Linking Structure and Function

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Responses in root growth, nitrogen metabolism and nutritional quality in Brachiaria with the use of thiamethoxam

Cited by 22 publications

References 24 publications

Changes in light quality alter physiological responses of soybean to thiamethoxam

Changes in light quality alter physiological responses of soybean to thiamethoxam

Thiamethoxam Altera O Conteúdo De Pigmentos Fotossintetizantes E Biomassa De Milho: Análise Em Casa-De-Vegetação E No Campo

Shortage of Biodiversity in Grassland

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