N素营养对NaCl胁迫下盐地碱蓬幼苗生长及渗透调节物质变化的影响

通过NaCl和N对盐地碱蓬幼苗生长及渗透调节物质变化的影响研究,结果表明,NaCl和N素对植物的生长的影响是明显的(P<0.05),低NaCl胁迫下N含量的增加对盐地碱蓬幼苗生长的影响不明显,而高NaCl处理下增加营养液中N的含量能明显地缓解盐胁迫,促进盐地碱蓬幼苗的生长.叶片脯氨酸含量随着NaCl浓度和养分N含量的增加而增加,而可溶性糖含量减少. NaCl浓度的增加使得植株总离子含量、Na 含量增加,K 、Ca2 、Mg2 含量减少.随N养分含量的增加,叶中Na 和K 含量增加, Mg2 含量基本上呈减少的趋势.叶片中的Ca2 含量和植株根茎部各离子含量随养分N含量增加的变化规律不明显.

The effects of nitrogen on the growth and solutes of halophyte Suaeda salsa seedlings under the stress of NaCl

The pretreated Suaeda salsa seedlings were transferred to Hoagland Suspension mixed with different concentration of NaCl and N. The result showed that the combined effect of NaCl and N on the seedlings is significant (P < (0.05)). N had little effect on seedlings growth in low salt stress. However, N can alleviate the stress and promote seedlings growth significantly in strong stress. With an increase of NaCl concentration and N content, proline content increased and soluable sugar content in leaves decreased. The total ion content and Na~+ content increased while K~+, Ca~(2+), and Mg~(2+)content decreased as NaCl increased. Na~+ and K~+ content in leaves increased with the increasing of N and basically Mg~(2+) content decreased. Ca~(2+)content in leaves and Na~+, K~+, Ca~(2+)and Mg~(2+) content in stem and root changed irregularly with the increasing of N content.