The “100‐seed weight (100‐SW)” trait is an important component of soybean quality and yield. Phosphorus (P) deficiency induces a wide array of metabolic effects that limits plant growth, especially in soybean. In this study, the 100‐SW values of a recombinant inbred line (RIL) population constructed by a cross between “Zhongdou27” and “Jiunong20” were evaluated in three tested environments under regular P and low P level conditions. We detected 12 additive quantitative trait loci (QTL) on nine linkage groups, explaining 8.11%–17.21% of the total phenotype variations. Two of these identified QTLs, qSW2‐3 and qSW17‐2, were identified in multi‐environments both under regular and low P level conditions, and explained 10.10%–14.11% and 10.12%–12.06% of the observed variations, respectively. One QTL, qSW17‐2, was novel which has been reported for the first time. Additionally, three QTLs (qSW10‐1, qSW13‐1 and qSW17‐1) were detected under low P conditions and the other QTLs were detected specifically under regular P levels. These particular QTLs improve our understanding of the genetic basis of P efficiency in soybean.

中文翻译：

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不同磷肥水平下大豆（Glycine max）100种子重的数量性状基因座的鉴定

“ 100粒重（100-SW）”性状是大豆品质和产量的重要组成部分。磷（P）缺乏会引起各种各样的代谢作用，从而限制植物的生长，尤其是在大豆中。在这项研究中，在常规P和低P水平条件下的三种测试环境中，评估了由“ Zhongdou27”和“ Jiunong20”之间的杂交构建的重组自交系（RIL）群体的100-SW值。我们在9个连锁组上检测到12个加性定量性状基因座（QTL），解释了总表型变异的8.11％–17.21％。在正常环境和低P水平条件下，在多个环境中均识别出其中两个已确定的QTL，即qSW2-3和qSW17-2，它们分别解释了所观察到的变异的10.10％–14.11％和10.12％–12.06％。一个QTL qSW17-2 是新颖的，这是第一次报道。此外，在低P条件下检测到三个QTL（qSW10-1，qSW13-1和qSW17-1），而其他QTL在常规P水平下专门检测到。这些特殊的QTL改善了我们对大豆磷效率遗传基础的认识。