Soybean response to water: A QTL analysis of drought tolerance
Soybean response to water: A QTL analysis of drought tolerance
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DOI：
10.2135/cropsci2001.412493x
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发表时间：
2001-03-01
期刊：
影响因子：
2.3
通讯作者：
Lark, KG
中科院分区：
文献类型：
--
作者：
Specht, JE;Chase, K;Lark, KG
大豆[甘氨酸]（L.）稳定。]产量，当回归到补充0 - 100%季节蒸散（ET）所需的水分时，产生了季节特定水利用效率（WUE）的估计。如果高产基因型具有较小的β，则不可预测的水分缺乏的影响可能会减轻。我们的目的是确定β和碳同位素辨别（CID）的遗传基础，CID是蒸腾效率（TE）的理论指标。用236个重组自交系（Rns）组成的‘Minsoy’x‘Noir 1’群体，在665个位点进行基因分型，在6种水处理（100、80、60、40、20和0% ET）下进行了2个月的评估。1994年的水分胁迫较温和，但1995年的高温和无降雨导致干旱严重，100% ET处理需要41厘米的灌溉。1995年产量-水分回归呈高度线性(28 kg ha（-1) cm(-1)）。基因型x水（G x W）相互作用是由于基因型异质性造成的。CID与beta的相关性很低（r = 0.26），因此选择更好的叶片TE可能不会提高作物的水分利用效率。考虑到产量与产量的相关性（r = 0.71），选择低beta（对干旱的敏感度较低）将是困难的。除U09-C2连锁组中有一个CID QTL外，产量β、产量和CID的主要数量性状位点（QTL）与成熟度和/或决定性QTL一致，但对β没有影响。干旱条件下大豆产量性状的遗传改良，最好是将高产均值与高产（而非低）β结合起来。
Soybean [Glycine mat (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' x 'Noir 1' population of 236 recombinant inbred lines (Rns), genotyped at 665 loci, was evaluated in six water treatments (100, 80, 60, 40, 20, and 0% ET) for 2 Jr. 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 x water (G x 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.