首页|Seed inoculation with Azospirillum brasilense in the U.S. soybean systems

Seed inoculation with Azospirillum brasilense in the U.S. soybean systems

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  • NSTL
  • Elsevier
? 2022 Elsevier B.V.Symbiotic nitrogen (N) fixation (SNF) is critical to satisfying the nutritional need of soybean (Glycine max (L.) Merr.) and maintaining productivity and high seed protein concentration. Due to its low environmental impact, a key factor for increasing the sustainability of soybean systems is to enhance SNF. Seed inoculation with the free-living Azospirillum brasilense alone or with Bradyrhizobium japonicum (herein called co-inoculation) are plausible strategies that have been explored in tropical environments but lack information in temperate regions. Following this rationale, this study aimed to evaluate the impact of seed inoculation with Azospirillum brasilense (herein called Azospirillum) alone or combined with Bradyrhizobium japonicum (herein called Bradyrhizobium) in a range of environments in the United States (US) for: (i) seed yield, (ii) relative abundance of ureides (RAU) as a proxy of SNF, and (iii) seed protein concentration. Twenty-five field studies across the US states with the same experimental design were performed during the 2019 and 2020 growing seasons. The primary outcomes of this research were: (i) yield responses to co-inoculation were considered significant in only 2 out of 25 site-years, (ii) RAU was not increased by Azospirillum inoculation or co-inoculation, and lastly, (iii) seed protein concentration was marginally associated with the inoculation strategies. Although Azospirillum did not impose remarkable gain in any observed plant traits, future studies should focus on mechanistically understanding whether Azospirillum can naturalize in temperate region soils. Still, strategies for enhancing SNF are required for sustainably improving productivity and quality for US soybean systems.

Bradyrhizobium japonicumCo-inoculationN fixationPlant beneficial microorganismsSustainability

de Borja Reis A.F.、Rosso L.H.M.、Adee E.、Ciampitti I.A.、Dan Davidson、Kovacs P.、Purcell L.C.、Below F.E.、Casteel S.N.、Knott C.、Kandel H.、Naeve S.L.、Singh M.P.、Archontoulis S.

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Department of Agronomy Kansas State University. Throckmorton Plant Science Center

Davidson Agronomics

Department of Agronomy Horticulture & Plant Science South Dakota State University

Department of Crop Soil and Environmental Sciences The University of Arkansas

Department of Crop Sciences University of Illinois

Department of Agronomy Purdue University

Department of Plant and Soil Sciences University of Kentucky

Department of Plant Sciences North Dakota State University

Department of Agronomy and Plant Genetics University of Minnesota

Department of Plant Soil and Microbial Sciences Michigan State University

Department of Agronomy Iowa State University

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2022

10.1016/j.fcr.2022.108537

Field Crops Research

Field Crops Research

SCI
ISSN：0378-4290
年,卷(期)：2022.283
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