Diers Brian W, Specht Jim, Rainey Katy Martin, Cregan Perry, Song Qijian, Ramasubramanian Vishnu, Graef George, Nelson Randall, Schapaugh William, Wang Dechun, Shannon Grover, McHale Leah, Kantartzi Stella K, Xavier Alencar, Mian Rouf, Stupar Robert M, Michno Jean-Michel, An Yong-Qiang Charles, Goettel Wolfgang, Ward Russell, Fox Carolyn, Lipka Alexander E, Hyten David, Cary Troy, Beavis William D
Department of Crop Sciences, University of Illinois, Urbana, IL, 61801
Department of Agronomy and Horticulture, University of Nebraska, Lincoln, NE, 68583.
G3 (Bethesda). 2018 Oct 3;8(10):3367-3375. doi: 10.1534/g3.118.200332.
Soybean is the world's leading source of vegetable protein and demand for its seed continues to grow. Breeders have successfully increased soybean yield, but the genetic architecture of yield and key agronomic traits is poorly understood. We developed a 40-mating soybean nested association mapping (NAM) population of 5,600 inbred lines that were characterized by single nucleotide polymorphism (SNP) markers and six agronomic traits in field trials in 22 environments. Analysis of the yield, agronomic, and SNP data revealed 23 significant marker-trait associations for yield, 19 for maturity, 15 for plant height, 17 for plant lodging, and 29 for seed mass. A higher frequency of estimated positive yield alleles was evident from elite founder parents than from exotic founders, although unique desirable alleles from the exotic group were identified, demonstrating the value of expanding the genetic base of US soybean breeding.
大豆是世界上植物蛋白的主要来源，对其种子的需求持续增长。育种者已成功提高了大豆产量，但产量和关键农艺性状的遗传结构仍知之甚少。我们构建了一个由5600个自交系组成的40交配大豆巢式关联作图（NAM）群体，这些自交系通过单核苷酸多态性（SNP）标记进行了特征分析，并在22个环境的田间试验中对六个农艺性状进行了测定。对产量、农艺性状和SNP数据的分析揭示了23个与产量显著相关的标记-性状关联、19个与成熟度相关的、15个与株高相关的、17个与植株倒伏相关的以及29个与种子质量相关的。尽管从外来亲本中鉴定出了独特的优良等位基因，但精英创始亲本中估计的正向产量等位基因频率明显高于外来亲本，这表明扩大美国大豆育种遗传基础的价值。
