102764 Soybean QTLs for Nitrogen and Ureides in Two Ril Populations Whose Parents Differ in Sensitivity of N2 Fixation to Drought.

Poster Number 458-1209

See more from this Division: C02 Crop Physiology and Metabolism
See more from this Session: Crop Physiology and Metabolism Poster

Wednesday, November 9, 2016
Phoenix Convention Center North, Exhibit Hall CDE

Andy Andy King1, Marilynn K. Davies2, Sadal Hwang3, Jeffery D. Ray4 and Larry C. Purcell1, (1)Department of Crop, Soil, and Environmental Sciences, University of Arkansas, Fayetteville, AR
(2)University of Arkansas, Fayetteville, AR
(3)Rural Development Administration, Korean National Institute of Crop Science, Jeollabuk-do, Korea, The Republic of
(4)Crop Genetics Research Unit, USDA-ARS, Stoneville, MS
Abstract:
Nitrogen fixation in soybean is sensitive to drought. N fixation was more tolerant to drought in soybean genotypes with low well-watered shoot-N concentration, without any apparent yield penalty associated with low shoot-N. Quantitative trait loci (QTLs) for shoot N and ureide concentrations were identified in two recombinant inbred line (RIL) populations [KS4895 x Jackson (KxJ) and KS4895 x PI424140 (KxP)] developed from parental lines differing for nitrogen fixation response to drought. For both RIL populations, broad-sense heritability for shoot-N and ureide concentrations ranged from 0.63 to 0.85 under irrigated conditions. Under drought conditions, heritability for shoot N was 0.22 to 0.24 and for ureide was 0.40 to 0.51. Composite interval mapping (CIM) indicated numerous QTLs for shoot N and/or ureide that overlapped between these two RIL populations and also with previously reported QTLs for N-associated traits in soybean. In previously published results for the KS4895 x Jackson 93705 RIL population, there were a total of nine QTLs identified for shoot N and ureide. Our data from the two RIL populations confirmed QTLs for shoot N/ureide for five of the nine QTLs reported previously on Gm9, Gm17, Gm19, and two on Gm13. We also identified novel QTLs for shoot N/ureide concentration in both the KxJ and KxP RIL populations on Gm10 and Gm11. In the KxP population, we identified a QTL for shoot ureide and N on Gm5 that overlapped with a previously reported QTL for specific leaf nitrogen.

See more from this Division: C02 Crop Physiology and Metabolism
See more from this Session: Crop Physiology and Metabolism Poster