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**AWARDS ISSUED PRIOR TO JANUARY 20, 2025, WERE FUNDED UNDER PREVIOUS ADMINISTRATIONS AND MAY NOT REFLECT THE PRIORITIES AND POLICIES OF THE CURRENT ADMINISTRATION.** IMPROVING NITROGEN USE EFFICIENCY IS ESSENTIAL FOR SUSTAINABLE AGRICULTURAL PRODUCTION, WITH THE ULTIMATE GOAL OF REDUCING NITROGEN FERTILIZER INPUTS WHILE MAINTAINING CROP PRODUCTIVITY AND DECREASING ENVIRONMENTAL DAMAGE. IN THIS PROJECT, WE WILL IDENTIFY HOW HIGH-NITROGEN USE EFFICIENCY CORN INFLUENCES PLANT-MICROBE INTERACTIONS AND THE ABILITY OF MICROBES TO DELIVER NITROGEN TO CORN. WE HYPOTHESIZE HIGH-NITROGEN USE EFFICIENCY CORN FOSTERS DIFFERENT MICROBIAL ASSEMBLAGES THAT WILL PRIME MICROBES TO RELEASE NITROGEN FROM SOIL ORGANIC MATTER FOR PLANT USE WHILE MINIMIZING NITROGEN LOSSES. MOREOVER, WE ANTICIPATE THAT SOME HIGH-NITROGEN USE EFFICIENCY CORN GENOTYPES WILL BE BETTER ABLE TO DIRECTLY ACQUIRE NITROGEN FROM SOIL THROUGH THEIR INTERACTIONS WITH SPECIFIC MICROBES.THE SPECIFIC OBJECTIVES OF OUR RESEARCH ARE TO (1) ASSESS HOW HIGH-NITROGEN USE EFFICIENCY CORN INFLUENCES RHIZOSPHERE (ROOT-ASSOCIATED) AND ENDOPHYTIC (WITHIN ROOT) MICROBIOME ASSEMBLY, (2) QUANTIFY HOW HIGH-NITROGEN USE EFFICIENCY CORN INFLUENCES RHIZOSPHERE NITROGEN-TRANSFORMATIONS, AND (3) ASSESS HOW MAIZE ROOT PROPERTIES ARE INFLUENCED BY GENOTYPE AND NITROGEN-FERTILIZATION. THIS RESEARCH WILL CAPITALIZE ON DIVERSE CORN LANDRACE ACCESSIONS THAT HAVE BEEN GENETICALLY INTEGRATED INTO A TEMPERATE IN-BRED LINE AND EXHIBITS HIGH-NITROGEN USE EFFICIENCY. WE WILL ALSO CAPITALIZE ON A SOIL OBTAINED FROM A LONG-TERM FIELD EXPERIMENT SITE THAT HAS GRADIENTS IN SOIL ORGANIC MATTER AND MICROBIAL COMMUNITY COMPOSITION. THESE RESOURCES WILL ALLOW US TO INTERROGATE POTENTIAL INTERACTIONS BETWEEN GENOTYPE AND FERTILIZER LEVELS ON PLANT-MICROBE INTERACTIONS USING A COMBINATION OF BIOCHEMICAL ANALYSES, SOIL LABORATORY INCUBATIONS, MICROBIAL COMMUNITY PROFILING, AND PLANT CHARACTERIZATIONS.THIS PROJECT DIRECTLY ADDRESSES THE PRIORITIES OF THE AGRICULTURAL MICROBIOMES PROGRAM BY IDENTIFYING PLANT GENETIC AND MICROBIAL CHARACTERISTICS THAT AFFECT CORN NITROGEN USE EFFICIENCY IN AGRICULTURAL SOILS. THE INSIGHTS GAINED FROM OUR PROJECT WILL IMPROVE OUR UNDERSTANDING OF MICROBIOMES THAT CAN HELP OPTIMIZE PLANT NUTRIENT USE EFFICIENCY AND POTENTIALLY REDUCE CHEMICAL INPUTS.

$740,000FY2021National Institute of Food and AgricultureUSDA

Iowa State University Of Science And Technology

Investigators

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**AWARDS ISSUED PRIOR TO JANUARY 20, 2025, WERE FUNDED UNDER PREVIOUS ADMINISTRATIONS AND MAY NOT REFLECT THE PRIORITIES AND POLICIES OF THE CURRENT ADMINISTRATION.** IMPROVING NITROGEN USE EFFICIENCY IS ESSENTIAL FOR SUSTAINABLE AGRICULTURAL PRODUCTION, WITH THE ULTIMATE GOAL OF REDUCING NITROGEN FERTILIZER INPUTS WHILE MAINTAINING CROP PRODUCTIVITY AND DECREASING ENVIRONMENTAL DAMAGE. IN THIS PROJECT, WE WILL IDENTIFY HOW HIGH-NITROGEN USE EFFICIENCY CORN INFLUENCES PLANT-MICROBE INTERACTIONS AND THE ABILITY OF MICROBES TO DELIVER NITROGEN TO CORN. WE HYPOTHESIZE HIGH-NITROGEN USE EFFICIENCY CORN FOSTERS DIFFERENT MICROBIAL ASSEMBLAGES THAT WILL PRIME MICROBES TO RELEASE NITROGEN FROM SOIL ORGANIC MATTER FOR PLANT USE WHILE MINIMIZING NITROGEN LOSSES. MOREOVER, WE ANTICIPATE THAT SOME HIGH-NITROGEN USE EFFICIENCY CORN GENOTYPES WILL BE BETTER ABLE TO DIRECTLY ACQUIRE NITROGEN FROM SOIL THROUGH THEIR INTERACTIONS WITH SPECIFIC MICROBES.THE SPECIFIC OBJECTIVES OF OUR RESEARCH ARE TO (1) ASSESS HOW HIGH-NITROGEN USE EFFICIENCY CORN INFLUENCES RHIZOSPHERE (ROOT-ASSOCIATED) AND ENDOPHYTIC (WITHIN ROOT) MICROBIOME ASSEMBLY, (2) QUANTIFY HOW HIGH-NITROGEN USE EFFICIENCY CORN INFLUENCES RHIZOSPHERE NITROGEN-TRANSFORMATIONS, AND (3) ASSESS HOW MAIZE ROOT PROPERTIES ARE INFLUENCED BY GENOTYPE AND NITROGEN-FERTILIZATION. THIS RESEARCH WILL CAPITALIZE ON DIVERSE CORN LANDRACE ACCESSIONS THAT HAVE BEEN GENETICALLY INTEGRATED INTO A TEMPERATE IN-BRED LINE AND EXHIBITS HIGH-NITROGEN USE EFFICIENCY. WE WILL ALSO CAPITALIZE ON A SOIL OBTAINED FROM A LONG-TERM FIELD EXPERIMENT SITE THAT HAS GRADIENTS IN SOIL ORGANIC MATTER AND MICROBIAL COMMUNITY COMPOSITION. THESE RESOURCES WILL ALLOW US TO INTERROGATE POTENTIAL INTERACTIONS BETWEEN GENOTYPE AND FERTILIZER LEVELS ON PLANT-MICROBE INTERACTIONS USING A COMBINATION OF BIOCHEMICAL ANALYSES, SOIL LABORATORY INCUBATIONS, MICROBIAL COMMUNITY PROFILING, AND PLANT CHARACTERIZATIONS.THIS PROJECT DIRECTLY ADDRESSES THE PRIORITIES OF THE AGRICULTURAL MICROBIOMES PROGRAM BY IDENTIFYING PLANT GENETIC AND MICROBIAL CHARACTERISTICS THAT AFFECT CORN NITROGEN USE EFFICIENCY IN AGRICULTURAL SOILS. THE INSIGHTS GAINED FROM OUR PROJECT WILL IMPROVE OUR UNDERSTANDING OF MICROBIOMES THAT CAN HELP OPTIMIZE PLANT NUTRIENT USE EFFICIENCY AND POTENTIALLY REDUCE CHEMICAL INPUTS. · GrantIndex