Soybean Response to Water: A QTL Analysis of Drought Tolerance | Zendy

Specht J.E. | Zendy; Chase K. | Zendy; Macrander M. | Zendy; Graef G.L. | Zendy; Chung J. | Zendy; Markwell J.P. | Zendy; Germann M. | Zendy; Orf J.H. | Zendy; Lark K.G. | Zendy

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Soybean Response to Water: A QTL Analysis of Drought Tolerance

Author(s) -

Specht J.E.,

Chase K.,

Macrander M.,

Graef G.L.,

Chung J.,

Markwell J.P.,

Germann M.,

Orf J.H.,

Lark K.G.

Publication year - 2001

Publication title -

crop science

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.76

H-Index - 147

eISSN - 1435-0653

pISSN - 0011-183X

DOI - 10.2135/cropsci2001.412493x

Subject(s) - biology , quantitative trait locus , water use efficiency , irrigation , agronomy , population , drought tolerance , transpiration , yield (engineering) , growing season , gene–environment interaction , trait , genotype , horticulture , zoology , botany , genetics , gene , photosynthesis , demography , materials science , sociology , computer science , metallurgy , programming language

Soybean [ Glycine max (L.) Merr.] yield, when regressed on water needed to replenish 0 to 100% seasonal evapotranspiration (ET), generates an estimate of season‐specific water‐use efficiency (WUE). The impact of unpredictable water deficits might be lessened if high‐yielding genotypes had a smaller beta. Our objective was to determine the genetic basis of beta and carbon isotope discrimination (CID), a theorized indicator of transpiration efficiency (TE). A ‘Minsoy’ × ‘Noir 1’ population of 236 recombinant inbred lines (RILs), genotyped at 665 loci, was evaluated in six water treatments (100, 80, 60, 40, 20, and 0% ET) for 2 yr. Water stress was mild in 1994, but high temperatures and no rainfall in 1995 led to a drought so severe that the 100% ET treatment required 41 cm of irrigation. The 1995 yield‐to‐water regression was highly linear (28 kg ha −1 cm −1 ). Genotype × water (G × W) interaction was due to genotypic heterogeneity in beta The CID vs. beta correlation was low ( r = 0.26), so selection for better leaf TE may not improve crop WUE. Selection of low beta (less sensitivity to drought) will be difficult, given the yield beta vs. yield correlation ( r = 0.71). The major quantitative trait loci (QTL) for yield beta , yield, and CID were coincident with maturity and/or determinancy QTLs, except for a CID QTL in linkage group U09‐C2, but it had no effect on beta Genetic improvement of soybean yield performance under drought would be better achieved by coupling a high‐yield grand mean with a high‐ (not low‐) yield beta

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