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采用营养液培养法 ,研究了缺Zn敏感 (IR2 6)和耐性水稻品种 (IR8192 31 2 )根生长和养分吸收受HCO-3影响的差异 .结果表明 ,HCO-3( 2 0mmol·L-1)严重抑制敏感品种根系生长 ,特别是在低Zn或缺Zn条件下 ,而对耐性品种影响很小 ,在低Zn水平下 ,对根系生长甚至有轻微的促进作用 .HCO-3不仅抑制敏感品种对Zn的吸收和分配 ,而且也抑制对Cu、Mn和Fe的吸收 ,表明HCO-3对Zn的吸收无专性抑制作用 ,HCO-3抑制敏感品种根系生长可能是其诱发缺Zn的最初作用 .HCO-3处理下 ,耐性品种上位叶和下位叶Zn浓度以及比率高于敏感品种 ,表明耐性品种将Zn从下位叶向上位叶转运的效率高 ,Zn在植物体内的转运能力可能是耐性品种适应石灰性土壤缺Zn的主要机制之一 .
The effects of HCO-3 on the growth and nutrient uptake of root and seedlings of IR2 6 and IR8192 31 2 were studied by using nutrient solution culture method. The results showed that HCO-3 (20 mmol·L -1 ) Significantly inhibited root growth of susceptible cultivars, especially in the condition of low or no Zn, but had little effect on tolerant cultivars, and even slightly promoted root growth at low Zn levels.HCO-3 not only inhibited the susceptibility of susceptible cultivars Zn absorption and distribution, but also inhibited the absorption of Cu, Mn and Fe, indicating that HCO-3 had no specific inhibition of Zn absorption. HCO-3 inhibited the root growth of susceptible varieties may be its initial role in inducing Zn deficiency Under the treatment of HCO-3, the Zn concentration and the ratio of upper and lower lobe of resistant varieties were higher than those of susceptible varieties, indicating that the Zn-tolerant cultivars had high Zn transport efficiency from the lower leaves to the upper lobe, and the transport ability of Zn in plants might be tolerant One of the main mechanisms to adapt to Zn deficiency in calcareous soil.