Identification and fine-mapping of a soybean quantitative trait locus on chromosome 5 conferring tolerance to iron deficiency chlorosis

Ryan Merry, Karl Butenhoff, Benjamin W. Campbell, Jean Michel Michno, Dechun Wang, James H. Orf, Aaron J. Lorenz, Robert M. Stupar

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Abstract

Iron deficiency chlorosis (IDC) is an important nutrient stress for soybean [Glycine max (L.) Merr.] grown in high-pH soils. Despite numerous agronomic attempts to alleviate IDC, genetic tolerance remains the most effective preventative measure against symptoms. In this study, two association mapping populations and a biparental mapping population were used for genetic mapping of IDC tolerance. Quantitative trait loci (QTLs) were identified on chromosomes Gm03, Gm05, and Gm06. Heterogenous inbred families were developed to fine-map the Gm05 QTL, which was uniquely supported in all three mapping populations. Fine-mapping resulted in a QTL with an interval size of 137 kb on the end of the short arm of Gm05, which produced up to a 1.5-point reduction in IDC severity on a 1 to 9 scale in near isogenic lines.

Original languageEnglish (US)
Article number190007
JournalPlant Genome
Volume12
Issue number3
DOIs
StatePublished - Nov 2019

Bibliographical note

Funding Information:
The authors are grateful to Adrian Stec for laboratory assistance. This work was supported in part by a United Soybean Board fellowship to R.M. and the United Soybean Board sponsored project #1920-172-0116-C.

Publisher Copyright:
© 2019 The Author(s).

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