NaCl胁迫对不同甘薯品种体内离子分配的影响

以济薯21、济徐23、济薯04150、徐薯26、徐薯27和徐薯28共6个甘薯品种为试材,用1/5 Hoag-land营养液附加不同浓度NaCl(0、0.2%、0.3%和0.5%)处理甘薯苗,观察其生长情况;100 d后取样分别测定根、茎、叶中的Na+含量和K+含量。结果表明,随着NaCl浓度升高,不同甘薯品种的生长均受到抑制,其中徐薯26受抑制程度最大;根、茎、叶中的Na+含量及Na+/K+比值都有所增加,根中Na+含量最高,而叶中Na+含量最低。可见盐胁迫条件下甘薯将较多的Na+储存在根中从而减少对地上部叶片的伤害,这可能是其忍耐高盐环境的重要机制之一。

Effect of NaCl Stress on Ion Distribution in Plants of Different Sweet Potato Varieties

Six sweet potato varieties(J21,JX23,J04150,X26,X27 and X28) were used as the test materials and treated by sodium chloride with the concentration of 0,0.2%,0.3% and 0.5% for 100 days.The growth of sweet potatoes was observed and the concentration of Na+ and K+ were measured in the roots,stems and leaves.The results showed that under salt stress,the growth of all the tested sweet potatoes,especially X26,was inhibited.The concentration of Na+ and the ratio of Na+/K+ in the roots,stems and leaves increased;Na+ content was the highest in the roots and the lowest in the leaves.In conclusion,storing most of Na+ in roots to reduce its damage to leaves may be an important way for sweet potatoes to endure higher salinity.