{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,4,25]],"date-time":"2026-04-25T03:00:44Z","timestamp":1777086044143,"version":"3.51.4"},"reference-count":108,"publisher":"MDPI AG","issue":"21","license":[{"start":{"date-parts":[[2021,10,28]],"date-time":"2021-10-28T00:00:00Z","timestamp":1635379200000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"name":"USDA-ARS","award":["3625-21220-006-00D"],"award-info":[{"award-number":["3625-21220-006-00D"]}]},{"DOI":"10.13039\/100000199","name":"USDA","doi-asserted-by":"publisher","award":["IOW04714"],"award-info":[{"award-number":["IOW04714"]}],"id":[{"id":"10.13039\/100000199","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/100016700","name":"North Central Soybean Research Program","doi-asserted-by":"publisher","award":["FAR0024859"],"award-info":[{"award-number":["FAR0024859"]}],"id":[{"id":"10.13039\/100016700","id-type":"DOI","asserted-by":"publisher"}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["IJMS"],"abstract":"<jats:p>Iron deficiency chlorosis (IDC) is an abiotic stress that negatively affects soybean (Glycine max [L.] Merr.) production. Much of our knowledge of IDC stress responses is derived from model plant species. Gene expression, quantitative trait loci (QTL) mapping, and genome-wide association studies (GWAS) performed in soybean suggest that stress response differences exist between model and crop species. Our current understanding of the molecular response to IDC in soybeans is largely derived from gene expression studies using near-isogenic lines differing in iron efficiency. To improve iron efficiency in soybeans and other crops, we need to expand gene expression studies to include the diversity present in germplasm collections. Therefore, we collected 216 purified RNA samples (18 genotypes, two tissue types [leaves and roots], two iron treatments [sufficient and deficient], three replicates) and used RNA sequencing to examine the expression differences of 18 diverse soybean genotypes in response to iron deficiency. We found a rapid response to iron deficiency across genotypes, most responding within 60 min of stress. There was little evidence of an overlap of specific differentially expressed genes, and comparisons of gene ontology terms and transcription factor families suggest the utilization of different pathways in the stress response. These initial findings suggest an untapped genetic potential within the soybean germplasm collection that could be used for the continued improvement of iron efficiency in soybean.<\/jats:p>","DOI":"10.3390\/ijms222111643","type":"journal-article","created":{"date-parts":[[2021,10,28]],"date-time":"2021-10-28T23:51:36Z","timestamp":1635465096000},"page":"11643","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":16,"title":["Comparing Early Transcriptomic Responses of 18 Soybean (Glycine max) Genotypes to Iron Stress"],"prefix":"10.3390","volume":"22","author":[{"given":"Daniel R.","family":"Kohlhase","sequence":"first","affiliation":[{"name":"Department of Agronomy, Iowa State University, Ames, IA 50011, USA"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Chantal E.","family":"McCabe","sequence":"additional","affiliation":[{"name":"U.S. Department of Agriculture (USDA)\u2014Agricultural Research Service (ARS), Corn Insects and Crop Genetics Research Unit, Ames, IA 50011, USA"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Asheesh K.","family":"Singh","sequence":"additional","affiliation":[{"name":"Department of Agronomy, Iowa State University, Ames, IA 50011, USA"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-2403-8946","authenticated-orcid":false,"given":"Jamie A.","family":"O\u2019Rourke","sequence":"additional","affiliation":[{"name":"U.S. Department of Agriculture (USDA)\u2014Agricultural Research Service (ARS), Corn Insects and Crop Genetics Research Unit, Ames, IA 50011, USA"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-9842-7701","authenticated-orcid":false,"given":"Michelle A.","family":"Graham","sequence":"additional","affiliation":[{"name":"U.S. Department of Agriculture (USDA)\u2014Agricultural Research Service (ARS), Corn Insects and Crop Genetics Research Unit, Ames, IA 50011, USA"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"1968","published-online":{"date-parts":[[2021,10,28]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"983","DOI":"10.1080\/00380768.2004.10408564","article-title":"Iron deficiency of soybean in the North Central U.S. and associated soil properties","volume":"50","author":"Hansen","year":"2004","journal-title":"Soil Sci. 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