O nitrato influencia o metabolismo de compostos nitrogenados em calopogônio (Calopogonium mucunoides) ao longo do ciclo de vida

Canatto, Regiane Aparecida; Aguiar, Leandro Ferreira; Justino, Gilberto Costa; Souza, Lucas Anjos; Camargos, Liliane Santos de

doi:10.5007/2175-7925.2014v27n1p1

Cited by 5 publications

(7 citation statements)

References 27 publications

(19 reference statements)

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“…For the leaf N content, the inoculated plants presented higher values owing to the efficiency of biological nitrogen fixation (BNF), which results in the production of ureides (allantoin and allantoic acid) in the nodules. These are sent to the aerial part, where they are dissociated into other forms of N, contributing to the proper physiological and biochemical functioning of the plant (Fagan et al, 2007;Canatto et al, 2013). Interestingly, BNF via inoculation led to an increase in the values observed for plant height, number of leaves, and total plant dry mass, when compared with those of the noninoculated plants.…”

Section: Resultsmentioning

confidence: 99%

Development of RR soybean in function of glyphosate doses and Bradyrhizobium inoculation

Bossolani

Poloni

Lazarini

et al. 2018

Rev. bras. eng. agríc. ambient.

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A B S T R A C TSoybean has traditionally been produced in systems that include the use of herbicides, often in higher than recommended doses. The process of symbiotic nitrogen fixation in legumes can be hampered by these herbicides, both by direct effects on rhizobia and indirect effects on the host plant. An outdoor experiment was performed to evaluate the effects of different doses of a glyphosate herbicide on Bradyrhizobium strains and biological nitrogen fixation in soybean BMX Potência RR plants. Soybean seeds were inoculated with Bradyrhizobium elkanii (SEMIA 5019) and Bradyrhizobium japonicum (SEMIA 5079) strains in a commercial liquid inoculant. The treatments consisted of the absence and presence of Bradyrhizobium genotypes inoculated via seed and four doses of the herbicide glyphosate applied on the leaves (0, 1.0, 2.0, and 4.0 L ha -1 of the commercial product) at the V 3 stage. The leaf chlorophyll index of inoculated RR soybean plants did not change on the application of glyphosate and, regardless of inoculation, plants had the capacity to recover from the effects of glyphosate application, without impaired development.Desenvolvimento da soja RR em função de doses de glifosato e da inoculação com Bradyrhizobium R E S U M OA soja tem sido produzida, tradicionalmente, em sistemas que incluem a utilização de herbicidas, muitas vezes em doses acima das recomendadas. O processo de fixação simbiótica de nitrogênio em leguminosas pode ser prejudicado por esses herbicidas, tanto por efeitos diretos sobre o rizóbio, como indiretos, sobre a planta hospedeira. Com o objetivo de avaliar o efeito de doses do herbicida glifosato sobre estirpes de Bradyrhizobium e a fixação biológica de nitrogênio em plantas de soja BMX Potência RR, foi realizado um experimento em vasos, conduzido a céu aberto. As sementes de soja foram inoculadas com as estirpes de Bradyrhizobium elkanii (SEMIA 5019) e Bradyrhizobium japonicum (SEMIA 5079). Foi utilizado um inoculante líquido comercial. Os tratamentos constituíram-se na ausência e presença das bactérias do gênero Bradyrhizobium inoculadas via semente e quatro doses do herbicida glifosato via foliar (0; 1,0; 2,0 e 4,0 L ha -1 do produto comercial) e aplicadas no estádio fenológico V 3 . A soja RR inoculada não altera o índice de clorofila foliar pela aplicação de glifosato e independentemente da inoculação, possui a capacidade de se recuperar da aplicação do glifosato, não prejudicando seu desenvolvimento.

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Section: Resultsmentioning

confidence: 99%

Development of RR soybean in function of glyphosate doses and Bradyrhizobium inoculation

Bossolani

Poloni

Lazarini

et al. 2018

Rev. bras. eng. agríc. ambient.

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“…Thus, alterations of glutamine levels appear to be related to the change in the site of nitrate reduction indicating that this mineral N source started to be reduced in the roots as previously proposed by Camargos et al (2006). The fact that nitrate acts inhibiting flowering may explain the alteration in the preferential site of nitrate reduction according to the developmental stage (Corbesier et al 2001;Canatto et al 2014).…”

Section: Discussionmentioning

confidence: 67%

Changes in soluble amino acid composition during Canavalia ensiformis development: responses to nitrogen deficiency

Camargos

Aguiar

Souza³

et al. 2015

Theor. Exp. Plant Physiol.

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A limited number of studies focusing nitrogen metabolism have been carried out with plants from Cerrado, the second largest biome of Brazil. Canavalia ensiformes is a legume native from Cerrado and is considered an important forage crop that contributes to soil nitrogen (N) improvement. There are few studies related to amino acid metabolism and growth capacity under nitrogen deficiency for this plant species. Therefore, the objective of this work was to study the profile of soluble amino acids during the growth cycle (from vegetative to the reproductive stage) of Canavalia ensiformis. Major changes in the concentration and composition of soluble amino acids at the beginning of the reproductive stage were observed indicating important alterations in amino acids metabolism. The data revealed that N-stress conditions led to increased aspartate and decreased asparagine contents in most organs and developmental stages of C. ensiformis. A pronounced increase in glutamate concentration during N-stress was also detected. Glutamine, alanine, GABA, threonine, histidine, arginine and glycine metabolisms were probably impaired by N deficiency, which was dependent upon plant developmental stage. The effect of nitrate presence or absence on amino acids metabolism in C. ensiformis is discussed.

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“…Some changes may be related to the changes in transport and accumulation of these metabolites under some type of abiotic stress (Camargos et al, 2012), or may be indicative of adaptation/acclimation to stressful situations for BNF under exposure to nitrate, for example, as Canatto et al (2013).…”

Section: Discussionmentioning

confidence: 99%

Glyphosate Effect on Nitrogen Fixation and Metabolization in RR Soybean

Bomfim¹,

Costa²,

Souza³

et al. 2017

JAS

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To evaluate under controlled temperature conditions, nutrition and water supply, the influence of glyphosate on nitrogen fixation capacity in Roundup Ready (RR) soybean, BRS Valiosa Roundup Ready. Commercially available seeds were sown in pots containing vermiculite and washed sand (1:1) and after germination, the seeds were inoculated with Bradyrhizobium sp. and kept in nutrient solution without nitrogen, in greenhouse, with temperature control to 27 ºC without photoperiod control, at UNESP, Ilha Solteira, SP. At the vegetative stage, glyphosate was applied at a concentration of 1.8 mg glyphosate/plant once a week. There were two harvests: after 15-21 days after herbicide application, and at reproductive stage. The chlorophyll content in leaves was analyzed and the organs were separated (leaves, roots and nodules) for extraction and quantitation of nitrogenous compounds, in addition to the enzyme allantoinase activity analysis (in vitro) and nitrogenase activity (in vivo). Nodules were counted and weighted. Means were compared by 5% Tukey's test. It was observed that the application of glyphosate in RR soybeans moderately affected N fixation and assimilation. There were no drastic metabolic changes for the aminoacids, proteins, chlorophylls and ureides in RR soybean treated with glyphosate.

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O nitrato influencia o metabolismo de compostos nitrogenados em calopogônio (Calopogonium mucunoides) ao longo do ciclo de vida

Cited by 5 publications

References 27 publications

Development of RR soybean in function of glyphosate doses and Bradyrhizobium inoculation

Development of RR soybean in function of glyphosate doses and Bradyrhizobium inoculation

Changes in soluble amino acid composition during Canavalia ensiformis development: responses to nitrogen deficiency

Glyphosate Effect on Nitrogen Fixation and Metabolization in RR Soybean

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