Karatassiou Maria, Giannakoula Anastasia, Tsitos Dimitrios, Stefanou Stefanos
Laboratory of Rangeland Ecology (PO 286), School of Forestry and Natural Environment, Aristotle University of Thessaloniki, 54636 Thessaloniki, Greece.
Laboratory of Plant Physiology, Department of Agriculture, International Hellenic University, 54700 Sindos, Greece.
Plants (Basel). 2021 Mar 10;10(3):516. doi: 10.3390/plants10030516.
A common garden experiment was established to investigate the effects of serpentine soil on the photosynthetic and biochemical traits of plants from three Greek populations of . We measured photosynthetic and chlorophyll fluorescence parameters, proline content, and nutrient uptake of the above plants growing in serpentine and non-serpentine soil. The photochemical activity of PSII was inhibited in plants growing in the serpentine soil regardless of the population; however, this inhibition was lower in the Aetolia-Acarnania population. The uptake and the allocation of Ni, as well as that of some other essential nutrient elements (Ca, Mg, Fe, Mn), to upper parts were decreased with the lower decrease recorded in the Aetolia-Acarnania population. Our results showed that excess Ni significantly increased the synthesis of proline, an antioxidant compound that plays an important role in the protection against oxidative stress. We conclude that the reduction in the photosynthetic performance is most probably due to reduced nutrient supply to the upper plant parts. Moreover, nickel accumulation in the roots recorded in plants from all three populations seems to be a mechanism to alleviate the detrimental effects of the serpentine soil stress. In addition, our data suggest that the population from Aetolia-Acarnania could be categorized among the nickel excluders.
开展了一项共同园试验，以研究蛇纹岩土对来自希腊三个种群的植物光合及生化特性的影响。我们测量了上述植物在蛇纹岩土和非蛇纹岩土中生长时的光合及叶绿素荧光参数、脯氨酸含量和养分吸收情况。无论种群如何，生长在蛇纹岩土中的植物PSII的光化学活性均受到抑制；然而，在埃托利亚-阿卡纳尼亚种群中这种抑制作用较小。镍以及其他一些必需营养元素（钙、镁、铁、锰）向植物上部的吸收和分配减少，埃托利亚-阿卡纳尼亚种群的减少幅度较小。我们的结果表明，过量的镍显著增加了脯氨酸的合成，脯氨酸是一种抗氧化化合物，在抵御氧化应激中起重要作用。我们得出结论，光合性能的降低很可能是由于植物上部养分供应减少所致。此外，所有三个种群的植物根系中镍的积累似乎是一种减轻蛇纹岩土胁迫有害影响的机制。此外，我们的数据表明，来自埃托利亚-阿卡纳尼亚的种群可归类为镍排斥型。
