Département Systématique et Evolution, Muséum National d'Histoire Naturelle, 75005, Paris, France.
Laboratoire Chrono-Environnement, UMR CNRS 6249, University of Franche-Comté, F-25030, Besançon, France.
Environ Monit Assess. 2018 Apr 4;190(5):266. doi: 10.1007/s10661-018-6645-z.
Salt is widely used to melt snow on roads especially in mountain regions. Whether as rock salt or aerosols, spread or sprayed over road surfaces, salt may result in increased salt concentrations in soils, which, in turn, affect natural vegetation, especially tree seedlings already subjected to various other types of abiotic stress. The authors investigated the effects of salt treatment-related stress on seedling growth and certain biochemical parameters in Quercus robur to determine ion concentrations in root tips. Seedlings growing in a quartz sand/vermiculite mixture were subjected to NaCl concentrations of 0, 50, or 100 mM for 5 weeks. The results showed that high NaCl concentrations caused a marked reduction in total leaf biomass 55 and 75% for 50 and 100 mM treatments, respectively, in dry weight of stems (84%) and roots (175%) for 100 mM treatment and modified root architecture, whereas no changes appeared in leaf number. A non-significant decrease in relative water content, with changes in ion balance was recorded. Comparison of stressed to control plants show an increase in sodium (3.5-8-fold), potassium (0.6-fold), and chloride (9.5-14-fold) concentrations in the root tips while the K/Na ratio decreased. In taproots, no significant biochemical differences were observed between the salt-treated and the control plants for acid invertase activity, reducing sugars, sucrose, or soluble protein contents. The significance of ion and sugar accumulations in relation to osmotic adjustment and the ability of oak seedlings to cope with salt stress are discussed.
盐被广泛用于融化道路上的积雪，尤其是在山区。无论是岩盐还是气溶胶，撒在或喷在道路表面，盐分可能导致土壤中盐浓度增加，进而影响自然植被，特别是已经受到各种非生物胁迫的树苗。作者研究了与盐处理相关的胁迫对栎树苗生长和某些生化参数的影响，以确定根尖的离子浓度。在石英砂/蛭石混合物中生长的幼苗在 0、50 或 100mM 的 NaCl 浓度下处理 5 周。结果表明，高 NaCl 浓度导致总叶片生物量显著减少，分别为 50mM 和 100mM 处理的 55%和 75%，干重的茎（84%）和根（175%），以及根系结构的改变，而叶片数量没有变化。记录到相对水含量没有明显下降，但离子平衡发生变化。与对照植物相比，应激植物的根尖钠离子（3.5-8 倍）、钾离子（0.6 倍）和氯离子（9.5-14 倍）浓度增加，而 K/Na 比值下降。在主根中，盐处理与对照植物之间的酸性转化酶活性、还原糖、蔗糖或可溶性蛋白质含量没有显著的生化差异。离子和糖积累与渗透调节的关系以及栎树苗应对盐胁迫的能力被讨论。
