Key message

Some species synthesize larger amounts of polyprenols, which probably increase the plant’s ability to mitigate salt stress. Salt stress does not cause macronutrient deficiency in the leaves of urban trees. Ionic imbalance in the leaves caused by soil salinity worsens the health status of sensitive species.

Abstract

Street trees are exposed to relatively high stress levels, and the average lifespan of street trees is shortened compared to those of trees living under controlled natural conditions. Soil salinity adversely affects trees at all stages of growth and development. This study attempts to determine how the urban environment, with particular emphasis on salt stress, affects tree species with different levels of salinity sensitivity. The aim of this study was to identify the strategies of eight tree species for mitigating salt stress based on the determination of the chemical composition of the macroelements in the leaves, the ionic imbalance, and the ability of the trees to synthesize and accumulate polyprenols in the leaves. The obtained results suggest that individual species implemented different strategies in response to salt stress. The low sensitivity species: Q. rubra, R. pseudoacacia, G. triacanthos and A. campestre. blocked the uptake of Cl and Na to the leaves. The medium-sensitivity species: P. x hispanica blocked the uptake of Cl and Na and G. biloba maintained very high contents of Cl and Na in its leaves without leaf damage and synthesized large amounts of polyprenols. G. triacanthos and A. campestre synthesized large amounts of polyprenols. The high-sensitivity species (T. x euchlora and A. platanoides) exhibited very high contents of Cl and Na in their leaves, which were significantly damaged and had a pronounced ionic imbalance. These effects were not compensated for by the increased synthesis of polyprenols. In conclusion, the accumulation of polyprenols in leaf tissue may be one of the strategies that increase the resistance of plants to salt stress. Plants have many other methods of mitigating salt stress.

中文翻译：

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城市树木缓解盐胁迫的策略：以八种植物为例

关键信息

一些物种合成了大量的聚戊二烯醇，这可能会增强植物缓解盐胁迫的能力。盐胁迫不会导致城市树木叶片中大量营养素缺乏。土壤盐分引起的叶片离子失衡使敏感物种的健康状况恶化。

抽象

街头树木承受相对较高的应力水平，与生活在受控自然条件下的树木相比，街头树木的平均寿命缩短了。土壤盐分在生长和发育的各个阶段均会对树木造成不利影响。这项研究试图确定城市环境，特别是盐胁迫，如何影响盐度敏感性不同的树木。这项研究的目的是确定8种树种缓解盐分胁迫的策略，具体方法是确定叶片中大分子的化学组成，离子不平衡以及树木在果皮中合成和积累聚戊二烯的能力。树叶。获得的结果表明，个别物种对盐胁迫采取了不同的策略。Q. rubra，R。pseudoacacia，G。triacanthos和A. campestre。阻止了Cl和Na对叶片的吸收。中度敏感性物种：西班牙种（P. x hispanica）阻止了对Cl和Na的吸收，而银杏G. oba在其叶片中保持了很高的Cl和Na含量，而没有损害叶片，并合成了大量的聚戊二烯酚。G. triacanthos和A. campestre合成了大量的聚戊二烯醇。高敏感性物种（T. x euchlora和A. platanoides）叶片中的Cl和Na含量非常高，被严重破坏并具有明显的离子失衡。这些影响不能通过增加聚戊二烯的合成来补偿。总之，聚戊二烯在叶片组织中的积累可能是增加植物对盐胁迫抗性的策略之一。植物还有许多其他缓解盐胁迫的方法。