摘要
采用水培法 ,研究了 Na Cl胁迫对耐盐性不同的两个棉花 (Gossypium hirsutum L .)品种 (枝棉 3号 ,耐盐性较强 ;泗棉 2号 ,耐盐性较弱 )幼苗叶片及根系 Ca、K、Mg、P、Mn、Cu、Fe、Zn等矿质元素含量的影响。用 ICP- AES法测定结果表明 ,经 1 0 0和 2 0 0 mmol· L- 1Na Cl分别处理 1 4d后 ,两品种棉花幼苗叶片及根系 Ca、K、Mg、P、Mn等元素含量均明显下降 ,其中尤其以 Mn、Ca、K元素含量下降最为显著。而 Fe、Zn、Cu等三种微量元素含量却有不同程度增加。随盐处理浓度增加 ,根系 Na+增加量趋于饱和 ,而叶片 Na+仍持续大量积累 ,导致植株体内阳离子含量显著增加 ,破坏了植株体内的离子平衡。耐盐性不同的两个棉花品种 ,叶片及根系 Ca、K、Mg、Mn、Zn等元素含量变化均无明显差异 ,而在叶片 Cu。
Solution culture experiments were conducted to study the effect of NaCl on mineral elements concentration of two cotton (Gossypium hirsutum L.) cultivars (Zhimian3, salt tolerant and Simian2, salt sensitive). Tissue concentra tions of Ca,K,Mg,P,Mn,Cu,Fe,Zn and Na by inductively coupled plasma atomic emission spectroscopy was determined . The authors report here that the concentrations of Ca、K、Mg、P、Mn in the leaves and roots of both cultivars were reduced severely after 14 days exposed to 100 or 200 mmol·L 1 NaCl. The decreases of Mn,Ca,K concentrations were more significanly while the concentrations of Cu,Fe and Zn increased. The Na concentration in the leaves is positively increased rapidly with NaCl concentration. Whereas the Na concentration in the roots was no more increased when NaCl concentration from 100 to 200 mmol·L 1 . The cation concentration of seedlings was significantly increased by the salinity. High concentration of cation in the plant tissue disturbed the ion homeostasis. There are no significant differences in the changes of Ca,K,Mg,Mn and Zn concentration in the leaves and roots of both species after exposed to NaCl. In the other hand,there are some differences in the Cu,Fe concentrations in leaves and the P concentrations in roots.
出处
《棉花学报》
CSCD
北大核心
2001年第4期225-229,共5页
Cotton Science
基金
江苏省自然科学基金资助项目 ( BK 970 91 )
