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Catroux, Gérard; Hartmann, Alain; Revellin, Cécile

doi:10.1023/a:1004777115628

Cited by 208 publications

(50 citation statements)

References 44 publications

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“…We showed that low inoculation density was optimal for soybean. It has been reported that 10 5 -10 6 rhizobia per seed are required to obtain maximum soybean seed yields [27] [28]. In this study, shoot, and/or root biomass were increased in some soybean cultivars in response to single or co-inoculation with P4.…”

Section: Discussionmentioning

confidence: 60%

Low-Density Co-Inoculation with Bradyrhizobium japonicum SAY3-7 and Streptomyces griseoflavus P4 Promotes Plant Growth and Nitrogen Fixation in Soybean Cultivars

Htwe¹,

Yamakawa²

2016

AJPS

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Inoculation density has a marked effect on nodulation and N fixation in soybean (Glycine max L.). Therefore, we conducted this study to determine the optimal inoculation density of Bradyhizobium japonicum SAY3-7 (SAY3-7) and Streptomyces griseoflavus P4 (P4) for plant growth, nodulation, and N fixation, and to investigate the effect of co-inoculation on selected soybean cultivars, using the optimal inoculation density. Nitrogen fixation, in terms of an acetylene reduction activity value, was measured using a flame ionization gas chromatograph. In this study, low-density single inoculation with P4 (10 5 or 10 6 cells mL -1 ) was associated with the highest plant biomass, compared with normal-and high-density single inoculation with P4 (10 7 or 10 8 cells mL -1 ). Moreover, low-density single or co-inoculations with SAY3-7 and/or P4 produced the highest nodule biomass and highest nitrogenase activity, compared with single or dual inoculation at other inoculation densities. Therefore, we evaluated low-density co-inoculation with P4 and SAY3-7, at the rate of 10 5 cells mL -1 , on selected soybean cultivars. Low-density co-inoculation increased the plant biomass, compared with un-inoculated plants. The effects of single and co-inoculation on nodulation did not differ significantly for any of the cultivars, except "Yezin-9" in the first experiment and "Shan Seine" in the second experiment. Low-density inoculation with both bacteria increased N fixation by 15% -75% for seven of the cultivars in the first experiment and by 15% -39% for three of the cultivars in the second experiment, compared with single inoculation with SAY3-7. A. Z. Htwe, T. Yamakawa 1653Based on the overall results, we concluded that low-density co-inoculation with P4 and SAY3-7 gave improved plant growth and N fixation.

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Section: Discussionmentioning

confidence: 60%

Low-Density Co-Inoculation with Bradyrhizobium japonicum SAY3-7 and Streptomyces griseoflavus P4 Promotes Plant Growth and Nitrogen Fixation in Soybean Cultivars

Htwe¹,

Yamakawa²

2016

AJPS

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“…This implies that N was limiting in soils of the study sites. Yield increases may not be observed in soils which receive quality inoculant if nitrogen is not a limiting factor (Catroux et al, 2001). Wilk’s lambda values indicated that more than 93% of the variations observed in soybean and cowpea were due to the applied inoculants confirming the earlier assertion that the strains used in this study were highly effective.…”

Section: Discussionmentioning

confidence: 99%

Bradyrhizobium Inoculants Enhance Grain Yields of Soybean and Cowpea in Northern Ghana

et al. 2016

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This study evaluated the symbiotic effectiveness and economic evaluation of Rhizobium inoculants with the objective of recommending the most effective inoculant strain for soybean and cowpea production in Northern Ghana. Field experiments were established in three locations using randomized complete block design with five blocks. A total of four treatments (Legumefix, Biofix, 100 kg N ha-1 and uninoculated control for soybean and BR 3267, BR 3262, 100 kg N ha-1 and uninoculated control for cowpea) were applied. At Nyankpala, inoculation of soybean with Legumefix and Biofix led to significant (P < 0.05) increases in nodule number (90–118%), nodule dry weight (>two-folds), and grain yield (12–19%) relative to the control. The Biofix effect on soybean grain yield was 1.5-fold of Legumefix. Similarly, inoculation of cowpea with BR 3262 and BR 3267 significantly (P < 0.05) increased nodule number (41–68%), nodule dry weight (45–65%), and grain yield (11–38%) relative to the control. Strain BR 3267 performed consistently (>two-folds) better than BR 3262 on grain yield. At Nyagli, there was no significant effect of inoculation on cowpea. Wilks lambda values (0.067, 0.039; P = 0.00) indicated that 93.3 and 96.1% of the variations observed in soybean and cowpea, respectively, were due to the applied inoculants. Biofix and BR 3267 were economically profitable with VCR ratio of 8.7 and 4.6, respectively. Based on grain yield and economic returns observed, Biofix and BR 3267 can be recommended in Nyankpala for inoculation of soybean and cowpea, respectively.

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“…However, the whole inoculation process may be compromised if inoculant products do not meet quality control standards. Therefore, establishing parameters that define the quality of inoculants is paramount for product standardization (Castroux et al, 2001;Herridge et al, 2002;Brasil, 2011).…”

Section: Introductionmentioning

confidence: 99%

Symbiotic Efficiency and Genotypic Characterization of Variants of Bradyrhizobium spp. in Commercial Inoculants for Soybeans

Barbosa

Costa

Ribeiro

et al. 2017

Rev. Bras. Ciênc. Solo

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High yields obtained from soybean [Glycine max (L.) Merrill], and consequent profits, are related to efficient symbiosis of soybean with nitrogen fixing bacteria of the Bradyrhizobium genus. Inoculation with strains belonging to the Bradyrhizobium japonicum, B. elkanii, and B. diazofficiens species, approved by the Brazilian Ministry of Agriculture (MAPA), is a common practice for this crop. However, variations in the composition of inoculants can change the quality of the product. The aim of this study was to genetically identify and to evaluate the symbiotic efficiency of isolates with cultural characteristics different from those of strains approved by MAPA and which are present in two commercial inoculants for soybean. Isolates obtained from inoculants and the strains SEMIA 5079 (CPAC 15), SEMIA 5080 (CPAC 7), SEMIA 587 (BR 96), and SEMIA 5019 (BR 29), indicated in the formulation of these inoculants, were tested for symbiotic efficiency in soybeans (cultivar: COODETEC 5G 830 RR) in a greenhouse. Identification by partial sequencing of the 16S rRNA gene, together with BOX-PCR analysis, showed that variant isolates were not similar to the inoculant strains indicated in the commercial products, despite belonging to the same genus and/or species. No loss was observed in the nodulation ability of the isolates; however, significant differences were reported in the symbiotic efficiency of the isolates compared to the inoculant strains approved by MAPA. Nevertheless, the presence of morphological variants did not influence the efficiency of inoculant products.

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Cited by 208 publications

References 44 publications

Low-Density Co-Inoculation with <i>Bradyrhizobium japonicum</i> SAY3-7 and <i>Streptomyces griseoflavus</i> P4 Promotes Plant Growth and Nitrogen Fixation in Soybean Cultivars

Low-Density Co-Inoculation with <i>Bradyrhizobium japonicum</i> SAY3-7 and <i>Streptomyces griseoflavus</i> P4 Promotes Plant Growth and Nitrogen Fixation in Soybean Cultivars

Bradyrhizobium Inoculants Enhance Grain Yields of Soybean and Cowpea in Northern Ghana

Symbiotic Efficiency and Genotypic Characterization of Variants of Bradyrhizobium spp. in Commercial Inoculants for Soybeans

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Untitled

Cited by 208 publications

References 44 publications

Low-Density Co-Inoculation with &lt;i&gt;Bradyrhizobium japonicum&lt;/i&gt; SAY3-7 and &lt;i&gt;Streptomyces griseoflavus&lt;/i&gt; P4 Promotes Plant Growth and Nitrogen Fixation in Soybean Cultivars

Low-Density Co-Inoculation with &lt;i&gt;Bradyrhizobium japonicum&lt;/i&gt; SAY3-7 and &lt;i&gt;Streptomyces griseoflavus&lt;/i&gt; P4 Promotes Plant Growth and Nitrogen Fixation in Soybean Cultivars

Bradyrhizobium Inoculants Enhance Grain Yields of Soybean and Cowpea in Northern Ghana

Symbiotic Efficiency and Genotypic Characterization of Variants of Bradyrhizobium spp. in Commercial Inoculants for Soybeans

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Low-Density Co-Inoculation with <i>Bradyrhizobium japonicum</i> SAY3-7 and <i>Streptomyces griseoflavus</i> P4 Promotes Plant Growth and Nitrogen Fixation in Soybean Cultivars

Low-Density Co-Inoculation with <i>Bradyrhizobium japonicum</i> SAY3-7 and <i>Streptomyces griseoflavus</i> P4 Promotes Plant Growth and Nitrogen Fixation in Soybean Cultivars