钾减轻杂交稻铁毒(英文)

Ameliorating effect of potassium on iron toxicity in hybrid rice

采用营养液培养法研究了钾对铁毒的缓解作用 .结果表明 ,过多的 Fe2 +会使杂交稻根系、地上部干重、根长及株高显著降低 ,且这种现象甚至在 Fe2 +水平较低时也很明显 .过多的 Fe2 +极大影响杂交稻的形态和植株中氮、磷、钾的含量 .高钾的供应可减轻高 Fe2 +离子的负效应 ,适当的钾素供应还可以减少 Fe2 +从根系向地上部的运输 ,尤其是向上位叶的运输 。

Toxicity of Fe 2+ has been a constraint to lowland rice production, potassium has the ameliorating effect on Fe 2+ toxicity Hybrid rice ( Oryza sativa L ) were grown in nutrient solution with three K supplies (0 26, 0 51 and 1 02 mmol/L) and five Fe 2+ levels (0 09, 0 18, 0 36, 0 54, and 0 90 mmol/L) Excessive Fe 2+ greatly decreased root and shoot dry weights, root length, and shoot height of the hybrid rice, and this depression was obvious even at relatively low Fe 2+ levels (above 0 18 mmol/L) Excessive Fe 2+ levels notably influenced morphological parameters and concentrations of K, P, and N in the plants High K supplies ameliorated the negative effects of higher Fe 2+ , as indicated by increases in biomass and nutrient contents Proper K supply reduced translocation of Fe 2+ from roots to shoots, especially to the upper leaves Phosphorus, which is antagonistic to Fe 2+ , was significantly increased by K supply Ameliorating effects of K may be attributed to the antagonistic effect of K on Fe absorption and translocation to shoots, especially to upper leaves, and to the improvement of plant nutritional status [WT5”BZ] [WT5”HZ]