NaCl胁迫对沙葱苗期根系特征及无机离子含量的影响

Effect of NaCl stress on root characters and inorganic ion contents of Allium mongolicum Regel

【目的】研究NaCl胁迫对沙葱苗期根系形态特征及无机离子含量的影响,分析沙葱的耐盐强度,以提高沙葱在盐碱地上的生产能力,为盐碱地的开发利用提供参考。【方法】以沙葱幼苗为材料,采用盆栽法,经不同浓度(0(对照,CK),25,50,75,100,150 mmol/L)NaCl胁迫15 d后,研究沙葱根系干质量、鲜质量、长度、表面积、体积、活力和无机离子(K+、Na+、Ca 2+、Mg 2+)含量的变化。【结果】随着NaCl浓度的增加,沙葱根系干、鲜质量和根系活力均呈降低趋势;而根系长度、表面积、体积均呈先增加后下降的趋势,当NaCl浓度为50 mmol/L时均达最大值。在不同浓度NaCl胁迫处理下,沙葱幼苗根系中Na+、K+含量均较对照增加,且当NaCl浓度为150 mmol/L时Na+、K+含量较高;但幼苗根系中Ca 2+、Mg 2+含量均较对照下降。【结论】适宜沙葱幼苗根系生长的NaCl浓度为25~50 mmol/L,此时根系生长良好,Ca 2+、Mg 2+含量无明显降低。

【Objective】The effect of NaCl stress on root characters and inorganic ions in Allium mongolicum Regel seedlings was researched and the salt tolerance was discussed to improve cultivation capacity of A.mongolicum Regel on saline-alkali soil.【Method】The changes of dry and fresh weights,length,surface area,volume,vitality and ions(K+,Na+,Ca 2+and Mg 2+)in roots of A.mongolicum Regel seedlings were detected 15 days after NaCl stress(0(control,CK),25,50,75,100 and 150 mmol/L)by potted method.【Result】The weights of dry and fresh and root activity of A.mongolicum Regel seedlings decreased with the increase of NaCl content.Root length,surface area and volume increased firstly and then decreased with peak values at 50 mmol/L NaCl.The contents of Na+and K+in root of A.mongolicum Regel seedlings were higher than CK with peaks in 150 mmol/L NaCl treatment.Ca 2+and Mg 2+contents decreased under NaCl stress.【Conclusion】NaCl at concentrations of 25-50 mmol/L was profitable for root growth of A.mongolicum Regel seedlings with good root growth and no decrease in Ca 2+and Mg 2+contents.