Abstract
Aluminum (Al) toxicity to plant roots is a major problem of acidic soils. The main chemical reaction involved is Al hydrolysis. Application of lime or nitrate fertilizers to raise soil pH reduces Al toxicity but not as economically as a plant genotypes with natural tolerance against this stress. Ammonium fertilization of crops and assimilation of ammonium (even that derived from dinitrogen) are particularly acidifying of the root zone. The aims of the present study were to find genotypes of soybean tolerant to aluminum stress and identify QTL underlying that trait. Used were recombinant inbred lines (RILs) derived from the cross of ‘Essex’ by ‘Forrest’. RILs were grown in a greenhouse for 3 weeks and then transferred to hydroponics in a growth chamber. Root lengths (RL) were measured before and 72 h after Al treatment. RL before and after Al treatment were measured and used to calculate root tolerance index (RTI) and relative mean growth (RMG). RILs 1, 85, 40 and 83 had significant (P < 0.005) tolerance to Al stress judged by RL after Al, RTI and RMG. Eleven minor but significant marker–trait associations (P < 0.05) were detected using one-way ANOVA but only two major loci were significant in composite interval maps (LOD >3.0). The QTL on linkage group F (chromosome 13) was in the interval Satt160–Satt252 with a peak at 24 cM (peak LOD was 3.3). The QTL underlay 31% of trait variation and the Essex allele provided an additional 1.61 cm of root growth over 72 h in the presence of Al. The QTL on linkage group C2 (probably chromosome 4) was in the interval from Satt202 to Satt371 with a peak at 3.2 cM (peak LOD was 14.7). The QTL underlay 34% of trait variation or 1.81 cm of growth over 72 h in the presence of Al. Both loci encompassed genes implicated in citrate metabolism, a method of aluminum detoxification known to vary among soybean cultivars. Two major loci and at least nine minor loci were inferred to underlie tolerance to Al. RILs and markers may be used to select alleles that increase tolerance to soybean against Al stress.
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Acknowledgments
This research was funded over the past 11 years in part by grants from the NSF 9872635, ISA 95-122-04; 98-122-02 and 02-127-03 and USB 2228-6228. The integrated genetic and physical map was based upon work supported by the National Science Foundation under Grant No. 9872635. Any opinions, findings, and conclusions or recommendations expressed in this material were those of the author(s) and do not necessarily reflect the views of the National Science Foundation or United States Department of Agriculture. The support of SIUC, College of Agriculture and Office of the Vice Chancellor for Research to DAL was appreciated. The authors thank James H. Klein III, Drs. P. Gibson, O. Myers Jr. and M. Schmidt for assistance with germplasm development and maintenance from 1991 to 2000. We thank the “Soybean Genome Project”, at “DoE Joint Genome Institute” for release of the WGS reads, scaffolds and genome sequence.
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Communicated by M. Bohn.
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Sharma, A.D., Sharma, H. & Lightfoot, D.A. The genetic control of tolerance to aluminum toxicity in the ‘Essex’ by ‘Forrest’ recombinant inbred line population. Theor Appl Genet 122, 687–694 (2011). https://doi.org/10.1007/s00122-010-1478-3
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DOI: https://doi.org/10.1007/s00122-010-1478-3