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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.** IRON DEFICIENCY CHLOROSIS (IDC) IS ONE OF THE MOST RECALCITRANT CHALLENGES ENCOUNTERED BY SOYBEAN GROWERS AND IS RESPONSIBLE FOR YIELD LOSSES ACROSS VAST ACREAGES, PARTICULARLY IN THE NORTH CENTRAL UNITED STATES. IDC OCCURS EARLY IN THE GROWING SEASON AND IS MOST SEVERE IN WET ALKALINE SOILS WITH HIGH LEVELS OF CALCIUM CARBONATE. AS THE PLANT DEVELOPS WITH INADEQUATE IRON, CHLOROPHYLL PRODUCTION IS REDUCED, INTERVEINAL CHLOROSIS APPEARS IN THE LEAVES, AND PRODUCTIVITY IS HINDERED. TO COMBAT IDC, SOYBEAN EXCRETES ACIDS AND CHEMICAL REDUCTANTS FROM ITS ROOTS INTO THE RHIZOSPHERE, THEREBY CONVERTING INSOLUBLE FE(III) TO THE MORE SOLUBLE FE(II) FORM. WHILE MANAGEMENT STRATEGIES CAN MITIGATE IDC SYMPTOMS, ANOTHER CRITICAL COMPONENT IS THE DEVELOPMENT OF RESISTANT CULTIVARS. HOWEVER, BREEDING FOR IDC TOLERANCE IS INEFFICIENT, AS IT SHOWS SUBSTANTIAL GENOTYPE X ENVIRONMENT INTERACTIONS, INHIBITING GENETIC IMPROVEMENT AND UNDERSTANDING OF THE TRAIT. FURTHERMORE, THE GENES AND MOLECULAR MECHANISMS UNDERLYING TOLERANCE TO IDC IN SOYBEAN REMAIN A SIGNIFICANT KNOWLEDGE GAP FOR THE RESEARCH COMMUNITY. THIS PROPOSAL SEEKS TO FILL THIS KNOWLEDGE GAP USING TWO DISTINCT APPROACHES: (1) FORWARD GENETIC CLONING OF A ROBUST IDC TOLERANCE QTL ON CHROMOSOME 5; (2) REVERSE GENETIC TESTING FOR IDC FUNCTION OF A COPY NUMBER VARIANT ENCODING A CYTOCHROME P450 RESPONSIBLE FOR BIOCHEMICAL CONVERSION OF ROOT EXUDATES. IDENTIFICATION AND VALIDATION OF THE GENE CANDIDATES FROM THESE TWO LOCI WILL INCREASE KNOWLEDGE OF THESE GENES UNDERLYING SOYBEAN IDC TOLERANCE, PROVIDE INSIGHT INTO THE UNDERLYING PHYSIOLOGY OF THE TRAIT, ENABLE NEW TOOLS FOR BREEDERS, AND INFORM BETTER MANAGEMENT STRATEGIES FOR AGRONOMISTS AND GROWERS.

$640,849FY2022National Institute of Food and AgricultureUSDA

Regents Of The University Of Minnesota

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.** IRON DEFICIENCY CHLOROSIS (IDC) IS ONE OF THE MOST RECALCITRANT CHALLENGES ENCOUNTERED BY SOYBEAN GROWERS AND IS RESPONSIBLE FOR YIELD LOSSES ACROSS VAST ACREAGES, PARTICULARLY IN THE NORTH CENTRAL UNITED STATES. IDC OCCURS EARLY IN THE GROWING SEASON AND IS MOST SEVERE IN WET ALKALINE SOILS WITH HIGH LEVELS OF CALCIUM CARBONATE. AS THE PLANT DEVELOPS WITH INADEQUATE IRON, CHLOROPHYLL PRODUCTION IS REDUCED, INTERVEINAL CHLOROSIS APPEARS IN THE LEAVES, AND PRODUCTIVITY IS HINDERED. TO COMBAT IDC, SOYBEAN EXCRETES ACIDS AND CHEMICAL REDUCTANTS FROM ITS ROOTS INTO THE RHIZOSPHERE, THEREBY CONVERTING INSOLUBLE FE(III) TO THE MORE SOLUBLE FE(II) FORM. WHILE MANAGEMENT STRATEGIES CAN MITIGATE IDC SYMPTOMS, ANOTHER CRITICAL COMPONENT IS THE DEVELOPMENT OF RESISTANT CULTIVARS. HOWEVER, BREEDING FOR IDC TOLERANCE IS INEFFICIENT, AS IT SHOWS SUBSTANTIAL GENOTYPE X ENVIRONMENT INTERACTIONS, INHIBITING GENETIC IMPROVEMENT AND UNDERSTANDING OF THE TRAIT. FURTHERMORE, THE GENES AND MOLECULAR MECHANISMS UNDERLYING TOLERANCE TO IDC IN SOYBEAN REMAIN A SIGNIFICANT KNOWLEDGE GAP FOR THE RESEARCH COMMUNITY. THIS PROPOSAL SEEKS TO FILL THIS KNOWLEDGE GAP USING TWO DISTINCT APPROACHES: (1) FORWARD GENETIC CLONING OF A ROBUST IDC TOLERANCE QTL ON CHROMOSOME 5; (2) REVERSE GENETIC TESTING FOR IDC FUNCTION OF A COPY NUMBER VARIANT ENCODING A CYTOCHROME P450 RESPONSIBLE FOR BIOCHEMICAL CONVERSION OF ROOT EXUDATES. IDENTIFICATION AND VALIDATION OF THE GENE CANDIDATES FROM THESE TWO LOCI WILL INCREASE KNOWLEDGE OF THESE GENES UNDERLYING SOYBEAN IDC TOLERANCE, PROVIDE INSIGHT INTO THE UNDERLYING PHYSIOLOGY OF THE TRAIT, ENABLE NEW TOOLS FOR BREEDERS, AND INFORM BETTER MANAGEMENT STRATEGIES FOR AGRONOMISTS AND GROWERS. · GrantIndex