The Effects Of Adding Ni To Sierozem On The Uptake And Translocation Of Mineral Eleme Nts In Wheat Plants In Arid Region

The uptake of mineral elements in plants has inspired intensive research interest in recent years. The translocation and accumulation behaviors of Ni in the organs of wheat plants and the effects of Ni stress on the uptake of other mineral elements were studied by means of pot experiment using the sierozem collected from northwestern China as experimental soil in this study, and the results could provide a scientific support to prevent or control heavy metal pollution in an arid region.The evaluation of the distribution of Ni in different parts of wheat plants at different adding-Ni concentrations implied that Ni was mainly accumulated in the wheat roots at different growing period. The content of Ni distributed in the grains of wheat plants was too high, so it should be taken into consideration that the risk of the translocation of Ni to the grains of wheat plants in Ni heavily contaminated soils in the arid areas, northwest China.As the Ni level increased, the BCF of Ni in roots trended to decrease, indicating that the Ni uptake ability of the roots decreased with the increase of Ni level. As the Ni level became higher, the TF of Ni in different parts of wheat plants tended to increase. This suggested that the translocation of Ni from root to other parts of wheat plants was enhanced. The TF of wheat plants in different growing period were all lower than 1, indicating that the translocation ability of Ni from the roots to the aboveground parts was poor.Moreover, with the increase in Ni level, the content of Ca and Mg in the non-reproductive organs of wheat plants increased significantly, and showed a good correlation with the content of Ni. The reason for this phenomenon may be that wheat plants could enhance their resistance effect to Ni by take in a large number of Ca and Mg. In this way, wheat plants could reduce the toxic effect of Ni and maintain normal life activities. Excessive Ni in wheat plants could inhibit the translocation of Fe, Cu, Mn and Mg to the grains, which may stunt the growth of wheat plants. The increase of the concentration of Ni in plants could disturb the uptake and distribution of other mineral elements in plants, which is the main reason for the toxic effect of Ni on plants.