Transmission Frequencies of Introgressed Festuca pratensis Chromosomes and Chromosome Segments in Lolium perenne
Transmission Frequencies of Introgressed Festuca pratensis Chromosomes and Chromosome Segments in Lolium perenne
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DOI：
10.2135/cropsci2013.03.0209
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发表时间：
2013-09
期刊：
影响因子：
2.3
通讯作者：
J. King;I. Armstead;J. Harper;I. King
中科院分区：
文献类型：
--
作者：
J. King;I. Armstead;J. Harper;I. King
近缘种遗传变异向作物的渗透是培育优良植物品种的重要途径。基因渗入的主要目的是将亲缘物种的一小段染色体转移到作物物种的染色体上（通过减数分裂时的重组），从而产生种间重组染色体。我们对作用于种间重组产物的选择压力知之甚少。在黑麦草和草地羊茅之间培育了7个单体替代系。当每个品系回交到二年生扁豆时，草地扁豆染色体与其同系物发生重组，导致回交群体携带二年生扁豆/F。Pratensis重组染色体。本文描述了种间重组染色体的产生频率与其传递给下一代的频率之间的关系。结果表明，草芥染色体和二年生l.p erenne/F的遗传存在中性、负性和正性选择压力。Pratensis重组染色体通过配子传递给下一代。所观察到的选择压力类型取决于所研究的草芥染色体来自哪个连锁群。讨论了这些结果的含义。
The introgression of genetic variation from related species into crops provides an important route by which superior plant varieties can be produced. The primary aim of introgression involves the transfer of a small chromosome segment from a related species into a chromosome of a crop species (via recombination at meiosis) to generate an interspecific recombinant chromosome. Very little is known about the selective pressures that act on the products of interspecific recombination. Seven monosomic substitution lines were developed between Lolium perenne and Festuca pratensis. When each line was backcrossed to L. perenne recombination occurred between the F. pratensis chromosome and its L. perenne homoeologue, resulting in backcross populations carrying L. perenne/F. pratensis recombinant chromosomes. This paper describes the relationship between the frequency of generation of interspecific recombinant chromosomes with the frequency of their transmission to the next generation. The results reveal the presence of neutral, negative, and positive selection pressures for the transmission of F. pratensis chromosomes and L. perenne/F. pratensis recombinant chromosomes through the gametes to the next generation. The type of selection pressure observed depended on which linkage group the F. pratensis chromosome under study was derived from. The implications of these results are discussed.