Mineral nitrogen impairs the biological nitrogen fixation in soybean of determinate and indeterminate growth types

Saturno, Diogo Fernando; Cerezini, Paula; Silva, Pedro Moreira da; Oliveira, Arnold Barbosa de; Oliveira, M. C. N. de; Hungría, Mariangela; Nogueira, Marco Antônio

doi:10.1080/01904167.2017.1310890

Cited by 48 publications

(49 citation statements)

References 25 publications

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“…Therefore, spatial variation in soil nutrients could generate variation in host control over ineffective symbionts. There is evidence that resource satiation can lead hosts to downregulate symbiosis pathways in some systems, for instance when N fertilization causes legumes to form fewer root nodules with rhizobia (Streeter & Wong, ; Saturno et al ., and references therein). But other studies have found mixed effects (Heath et al ., ) or no effects of resource satiation on host control traits (Kiers et al ., ; Regus et al ., ; Grillo et al ., ).…”

Section: Introductionmentioning

confidence: 99%

Host investment into symbiosis varies among genotypes of the legume Acmispon strigosus, but host sanctions are uniform

et al. 2018

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Efficient host control predicts the extirpation of ineffective symbionts, but they are nonetheless widespread in nature. We tested three hypotheses for the maintenance of symbiotic variation in rhizobia that associate with a native legume: partner mismatch between host and symbiont, such that symbiont effectiveness varies with host genotype; resource satiation, whereby extrinsic sources of nutrients relax host control; and variation in host control among host genotypes. We inoculated Acmispon strigosus from six populations with three Bradyrhizobium strains that vary in symbiotic effectiveness on sympatric hosts. We measured proxies of host and symbiont fitness in single- and co-inoculations under fertilization treatments of zero added nitrogen (N) and near-growth-saturating N. We examined two components of host control: 'host investment' into nodule size during single- and co-inoculations, and 'host sanctions' against less effective strains during co-inoculations. The Bradyrhizobium strains displayed conserved growth effects on hosts, and host control did not decline under experimental fertilization. Host sanctions were robust in all hosts, but host lines from different populations varied significantly in measures of host investment in both single- and co-inoculation experiments. Variation in host investment could promote variation in symbiotic effectiveness and prevent the extinction of ineffective Bradyrhizobium from natural populations.

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Section: Introductionmentioning

confidence: 99%

Host investment into symbiosis varies among genotypes of the legume Acmispon strigosus, but host sanctions are uniform

et al. 2018

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“…On the other hand, presence of high N levels in the soil inhibits both nodule formation and nitrogenase activity (Saturno et al, 2017). Weisany et al (2013) reported that mineral N in the soil inhibited symbiotic nitrogen fixation but it was relative to start of nodulation and N 2 fixation at early vegetative growth at low concentration.…”

Section: Macronutrients Nitrogenmentioning

confidence: 99%

“…Nitrogen (N) is essential for plant growth, participating in several metabolic pathways and in the synthesis of molecules such as proteins, nucleic acids, hormones, and chlorophyll (Saturno et al, 2017;Bruijn, 2016).…”

Section: Macronutrients Nitrogenmentioning

confidence: 99%

Limitations and strategies to enhance biological nitrogen fixation in sub-humid tropics of Western Ethiopia

Dabessa¹,

Abebe²,

Bekele³

2018

J. Agric. Biotech. Sustain. Dev.

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Currently, inorganic nitrogen fertilizer becomes a serious threat to the environment and human health. Thus, finding alternate source of nitrogen is a viable option in assuring sustainable agricultural system. Biological nitrogen fixation is a critical and key process in sustainable agricultural systems in tropical soils, which are frequently deficient in N and susceptible to leaching of plant nutrients. This process transforms atmospheric nitrogen to ammonia, nitrate and nitrogen dioxide. Several key abiotic and biotic factors limit legume productivity and biological nitrogen fixation in World agriculture, especially in sub-Saharan Africa. Within the soil, rhizobia frequently encounter various stresses that affect their growth, initial steps of symbiosis and capability of nitrogen fixation. Biotic and abiotic stresses impose a major threat to agriculture and symbiotic nitrogen fixation is dependent on host cultivar and rhizobia, but as well may be limited by pedoclimatic factors. The most common factors affecting biological nitrogen fixation and symbiosis activity in western parts of Ethiopia are soil acidity, quality of inoculants and low soil fertility. In most cases, the microsymbiont is the more affected partner, with plants growing on mineral N usually less sensitive to these stresses. Thus, it can be concluded that, particularly in a western part of Ethiopia, many studies should be focused on acidity related constraints on biological nitrogen fixation, screening of acid tolerant inoculants and low soil fertility improvements to enhance biological nitrogen fixation in smallholder farming system.

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“…O macronutriente nitrogênio (N) é aquele demandado em maior quantidade pela soja devido ao alto teor de proteína em seus grãos, com exigência de aproximadamente 80 kg de N por tonelada de grãos, chegando a acumular de 250 a 280 kg de N ha -1 em casos onde a produtividade excede 4.000 kg ha -1 , sendo que 67 a 75% deste estão alocados nos grãos (ALVES; BODDEY; URQUIAGA, 2003;BOHRER;HUNGRIA, 1998;KINUGASA et al, 2012;SATURNO et al, 2017). A planta de soja pode obter o N de duas fontes: o pool de N mineral do solo, que pode ser proveniente da matéria orgânica do solo, ou de fertilizantes nitrogenados, e a fixação biológica do N2 atmosférico (FBN).…”

Section: Nitrogêniounclassified

“…A disponibilidade de N mineral no solo afeta negativamente tanto a nodulação como a FBN nos nódulos, como muitos trabalhos já comprovaram (FRANCO; DA FONSECA; MARRIEL, 1978;KASCHUK et al, 2016;SATURNO et al, 2017). Segundo Deninson e Harter (1995), a presença do N mineral reduz a permeabilidade do córtex dos nódulos, diminuindo a disponibilidade de O2 para a respiração nodular, e reduz a afinidade da leghemoglobina ao O2, aumentando a concentração de oxigênio que inativa o complexo nitrogenase, afetando a FBN.…”

Section: Efeito Do N Mineral Na Fbnunclassified

Contribuição de diferentes fontes de nitrogênio para a FBN e o metabolismo de N da soja

Casarin¹

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Mineral nitrogen impairs the biological nitrogen fixation in soybean of determinate and indeterminate growth types

Cited by 48 publications

References 25 publications

Host investment into symbiosis varies among genotypes of the legume Acmispon strigosus, but host sanctions are uniform

Host investment into symbiosis varies among genotypes of the legume Acmispon strigosus, but host sanctions are uniform

Limitations and strategies to enhance biological nitrogen fixation in sub-humid tropics of Western Ethiopia

Contribuição de diferentes fontes de nitrogênio para a FBN e o metabolismo de N da soja

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