以一整套"中国春"背景的单染色体代换系和受体"中国春"、供体"Synthetic 6x"为材料,研究了水培条件下磷胁迫对小麦苗期磷素吸收和利用能力的变化.结果表明,低磷条件下,"Synthetic 6x"比中国春在磷胁迫下有较高的磷吸收能力,较之供体"Synthetic 6x"和受体"中国春",各代换系的单株磷累积能力存在较大差异,可划分为高效、中效和低效3个效率组,其中来自供体的A组染色体和3D染色体可能携带有耐低磷能力的主效基因:染色体6A、3D和2A的耐低磷能力较强.同时,与受体中国春相比,6A、3D和2A代换系在低磷条件下,还具有较高的单株氮累积量和含氮量,而且代换系6A和3D还具有较高的单株钾累积量和含钾量,推测6A、3D和2A代换系对多种养分的吸收具有重要的遗传调控作用,认为以这些代换系可作为小麦养分效率改良的重要种质资源.%Using a complete set of chromosome substitution lines (CSLs) in ＂Chinese Spring＂(CS) genetic backgrotind, ＂Chinese Spring＂, and chromosome donor ＂Synthetic 6x＂ as the experimental materials, the effects of chromosome substitution on phosphorus acquisition capacities in wheat seedling stage under Pi-stressed condition were analyzed under hydropinically growth condition. Under the Pi-stress condition, the accumulative P amount per plant in ＂Synthetic 6x＂ is more significantly increased than in CS. The accumulative P amount per plant among the CSLs, CS, and ＂Synthetic 6x＂ varied largely and could be classified into three subgroups, including high-efficiency, mid-efficiency, and low-efficiency. The genome A and chromosome 3D are suggested to carry the major genes controlling the high-efficiency of P use under the low-Pi supply. Among them, chromosome 6A, 3D, and 2A showed much higher genetic effects than other chromosomes. In the meantime, compared with CS, the CSL 6A, 3D, and 2A also had a remarkably increased accumulative N amounts per plant and N contents, and the CSL also showed an obvious increased accumulative K amounts and K contents. These results clearly indicated that above chromosomes of ＂Synthetic 6x＂ play key roles on regulation of the acquisition of N, P, and K in wheat. Therefore, above chromosome susctitution lines could be used as the recipicent on genetic improvement of inorganic nutrient use efficiency in wheat in the future.
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