NaCl胁迫对水培枳和枸头橙幼苗生长及盐离子分布的影响

Effect of NaCl Stress on Seedling Growth and Saline Ions Distribution in Trifoliate and Citrus aurantium cv. Goutoucheng

以耐盐性不同的柑桔砧木枳和枸头橙的实生幼苗为材料,分析NaCl(60mmol/L)胁迫后水培植株生长表现以及盐离子(Na^+和Cl^-)在叶片、茎和根中的含量。结果表明,NaCl胁迫抑制了植株株高和干重的增加,而枳受抑制程度高于枸头橙。NaCl胁迫导致2种砧木苗叶片相对电导率升高,枳高于枸头橙。NaCl胁迫后2种砧木苗的叶片、茎和根中Na^+和Cl^-含量均上升。除了NaCl胁迫21 d内枳叶片Cl^-含量低于枸头橙外,其他时间枳叶片和茎中的盐离子含量均高于枸头橙。NaCl胁迫前期枳根中盐离子含量高于枸头橙,后期则是枸头橙高于枳。

Two citrus rootstocks（trifoliate orange and Goutoucheng）that differ in salt tolerance were used as materials in this study.The plant growth and saline ions（Na~＋and Cl^-）contents were investigated after the plants exposed to 60 mM NaCl.Results indicated that NaCl stress inhibited plant height and dry mass,and the inhibition on trifoliate orange was greater than that of Goutoucheng.NaCl stress increased the leaf relative electrical conductivity of these two rootstocks,but trifoliate orange showed higher leaf relative electrical conductivity than Goutoucheng.NaCl stress increased the saline ions content in leaves,stems and roots of both rootstocks.Na~＋and Clconcentrations in leaves and stems of trifoliate orange were higher than those of Goutoucheng,except the leaf accumulated more Cl-in Goutoucheng within 21 days after salinity treatment.Na~＋and Cl^-concentrations in roots of trifoliate orange were higher than those of Goutoucheng within 15 days after NaCl stress,but lower afterward.