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研究了盐碱胁迫对向日葵子叶渗透调节及离子平衡的影响。以向日葵品种白葵杂6号为试验材料,中性盐Na Cl、Na2SO4及碱性盐Na HCO3、Na2CO3分别按摩尔比9︰1混合模拟盐胁迫、碱胁迫,各设计2种处理。结果表明,盐碱胁迫下,向日葵子叶中起渗调作用的主要无机离子和有机离子分别为K+、有机酸。通过试验结果推测,为了适应盐、碱胁迫,向日葵可能在体内启动了特殊的钠钾吸收转运通道,并且通过大量合成有机酸来维持细胞内离子平衡及p H稳定。
The effects of saline-alkali stress on osmotic adjustment and ion balance of sunflower cotyledons were studied. Taking Sunflower variety Baikui-6 as test material, neutral salt Na Cl, Na2SO4 and alkaline salt Na HCO3, Na2CO3 were mixed at a molar ratio of 9: 1 respectively to simulate salt stress and alkali stress. The results showed that the major inorganic ions and organic ions that played the role of infiltration in sunflower cotyledons under salt-alkali stress were K + and organic acids, respectively. The results suggest that in order to adapt to salt and alkali stress, sunflower may activate special sodium-potassium absorption and transport channels in vivo, and maintain intracellular ion balance and p H stability by synthesizing a large amount of organic acids.