Effects of chromosome substitution on phosphorus acquisition capacities in wheat seedling stage under Pi-stressed condition

Using a complete set of chromosome substitution lines(CSLs) in "Chinese Spring"(CS) genetic background,"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.