蛇纹石土壤重金属丰富,养分贫乏,限制植物物种的性能和存活。然而,这些限制的特殊性以及在蛇形环境中蓬勃发展所需的适应性特征几乎是未知的。南非的巴伯顿绿岩带是一个具有适应植被的蛇形土壤的地区的例子。在这项研究中,进行了盆栽实验以比较开发特征(即,发芽率,叶数,叶长,生物量和光合能力)在非蛇纹石物种Berkheyaradula的早期发育过程中,一个属,由来自南非蛇形地区的已知金属超积累菌组成。B.radula生长在取自Barberton地区的蛇形土壤中。B.radula叶子的重金属浓度证实了该物种作为植物提取剂。与对照相比,蛇纹石处理的生产力和光合作用有增强的趋势。叶数,叶长,电子传输效率(ΦEo/(1-ΦEo),反应中心和PIABS的密度,总量与叶片中至少一种重金属呈显著正相关。发芽率受K、而生物量和反应中心的密度受到Ca和P的负面影响,只有Ca,分别。重金属Zn,Ni和Co呈正相关,而它们与常量营养素K呈负相关,Ca和P。后者呈正相关,证实对照土壤的肥力较高。我们的研究表明,B.radula表现出金属植物特征(即,预适应),尽管不是在富含金属的土壤上自然产生的,这提供了证据,证明该属的蛇纹石和非蛇纹石物种具有生物积累和植物修复的潜力。
Serpentine soils are rich in heavy metals and poor in nutrients, limiting plant species\' performance and survival. Nevertheless, specificities of such limitations as well as adaptability features required for thriving in serpentine environments are barely known. The Barberton Greenstone Belt in South Africa is an example of an area containing serpentine soil with adapted vegetation. In this study, a pot experiment was performed to compare development features (i.e., germination rates, leaf count, leaf length, biomass and photosynthetic capacity) during the early development of the non-serpentine species Berkheya radula, a genus consisting of known metal hyperaccumulators from serpentine areas in South Africa. B. radula was grown in serpentine soils taken from the Barberton region. B. radula leaves had heavy metals in concentrations that confirmed the species as a phytoextractor. There were trends for enhanced productivity and photosynthesis in the serpentine treatments compared to the control. Leaf count, leaf length, electron transport efficiency (ψEo/(1 - ψEo), density of reaction centers and PIABS,total were significantly and positively correlated with at least one of the heavy metals in the leaves. Germination rates were positively influenced by K, whereas biomass and the density of reaction centers were negatively affected by Ca and P, and only Ca, respectively. The heavy metals Zn, Ni and Co were positively correlated with each other, whereas they were negatively correlated with the macronutrients K, Ca and P. The latter correlated positively with each other, confirming higher fertility of the control soil. Our study suggests that B. radula exhibits
metallophyte characteristics (i.e., preadapted), despite not naturally occurring on metal-enriched soil, and this provides evidence that the potential for bioaccumulation and phytoremediation is shared between serpentine and non-serpentine species in this genus.