Draft genome sequence of Bradyrhizobium sp. strain Oc8 isolated from Crotalaria ochroleuca nodule

Berriel, Verónica; Morel, María A.; Filippi, Carla Valeria; Monza, Jorge

doi:10.1016/j.crmicr.2021.100074

Cited by 1 publication

(1 citation statement)

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“…To this respect, Macedo et al (2015) reported that previous attempts to inoculate in Uruguay several tropical legume species with strains of Bradyrhizobium spp from Brazil produced poor results in terms of the number of nodulated plants and numbers of nodules per plant, in all evaluated species, although the most acceptable result was observed in C. juncea. Moreover, recent findings of Berriel et al (2021) showed that a rhizobia strain isolated from C. ochroleuca was highly effective at nodulating C. -----------------Statistics (p) ------------------ The high BNF potential of G. max found here is not surprising, since in Uruguay this species is commonly planted as a cash crop and is usually inoculated with commercial inoculants when sown for this purpose. In our experiment, however, the convenience for this inoculation is not clear, since in 2018, when the maximum values of NmdFix were attained G. max was not inoculated, but in 2019 when it was inoculated, these values were much lower because of other limitations.…”

Section: Biological Nitrogen Fixationmentioning

confidence: 96%

Cajanus cajan: a promissory high-nitrogen fixing cover crop for Uruguay

Berriel

Perdomo

2023

Front. Agron.

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Cover crops can increase agricultural sustainability by protecting soil from erosion, increasing biodiversity, and symbiotically incorporating fixed nitrogen (N) into the soil. Nowadays, however, in Uruguay mostly grasses are planted in autumn to protect the soil from erosion. Another option is to study tropical legumes’ performance as cover crops, which can fix substantial amounts of nitrogen in short growing periods, thereby bridging the knowledge gap in Uruguayan agriculture. The main objective was to evaluate and compare the performance of six tropical legumes (Crotalaria juncea, Crotalaria spectabilis, Crotalaria ochroleuca, Cajanus cajan, Dolichos lablab, Mucuna pruriens) and the temperate legume Glycine max. The evaluation focused on aboveground biomass and the N mass derived from fixation (NmdFix), as well as other attributes; three field experiments were conducted on a southern Uruguay farm during the summers of 2017, 2018, and 2019. The growing cycle lengths for the cover crops in 2017, 2018, and 2019 were 117, 130, and 90 days, respectively. The results showed that when planting was done at late December (2017 and 2018 growing cycles), the species with the highest mean biomass yield were Crotalaria juncea (two year average 12.0 Mg ha-1) and Cajanus cajan (11.0 Mg ha-1), but Cajanus cajan (149 kg ha-1) more than doubled the NmdFix mass of Crotalaria juncea (57 kg ha-1). In 2018 biomass yields were much higher than in 2017, with Glycine max (20.0 Mg ha-1) yielding at a similar level to Crotalaria juncea and Cajanus cajan (20.5 and 18.7 Mg ha-1, respectively). Amounts of NmdFix, however, were much higher in Glycine max and Cajanus cajan (263 and 253 kg N ha-1, respectively), than in Crotalaria juncea (91 kg N ha-1). In 2019 planting had to be delayed until early February and only Glycine max maintained acceptable biomass and NmdFix levels. In conclusion, based on its fixing N potential, for late December sowings Cajanus cajan and Glycine max would be the most promising species for cover crop use, while for late January or early February sowings, only Glycine max would an option because the tropical species seriously impaired their productivity when grew longer into the cooler autumn temperatures.

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Section: Biological Nitrogen Fixationmentioning

confidence: 96%