盐胁迫下珠美海棠体内离子分配与叶片耐盐量研究

Ion distribution in plant and salt tolerability of leaves of Malus zumi under stress of NaCI

摘要: 对NaC1胁迫下珠美海棠体内K⁺ 、Na⁺、C1^-含量变化及电解质渗透率测定结果表明，NaC1胁迫下珠美海棠对K⁺的吸收及向地上部分运输能力基本保持不变，K⁺、Na⁺、C1^-含量随盐胁迫浓度的增加而显著增加，C1^-向地上部分运输的能力大于K⁺、Na⁺，Na⁺对珠美海棠的伤害远远大于C1^-，叶片耐Na⁺量为5.76g/kg，耐C1^-量为14.17g/kg。

Abstract: The contents of K⁺，Na⁺，C1^-and the percentage of electrolyte leakage of Malus zumi leaves under NaC1 stress are measured and analyzed．The results show that the ability of absorbing and transporting K⁺ of Malus zumi changes littie，and the contents of K⁺，Na⁺，C1^-increase as the concentration of NaC1 rises；the quantity of C1^- transported from roots to shoots is more than those of K⁺，Na⁺；the damage to the plant of Malus zumi caused by N is more serious than that caused by C1^-．The resistibility of Malus zumi leaves to N is 5．76g／kg and to C1^- is 14．17g／kg．