当前位置: X-MOL 学术New Forests › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
Manganese accumulation and tolerance in Eucalyptus globulus and Corymbia citriodora seedlings under increasing soil Mn availability
New forests ( IF 2.2 ) Pub Date : 2020-11-20 , DOI: 10.1007/s11056-020-09819-w
Vinícius Henrique De Oliveira , Sara Adrián López de Andrade

Manganese (Mn) is a nutrient that can cause phytotoxicity if above a threshold concentration. Acid soils are prone to excessive Mn levels that under certain environmental conditions may increase availability and exacerbate deleterious effects on plants. Apart from oxidative stress, excess Mn usually affects photosynthetic apparatus. Nonetheless, some plants are known to tolerate high Mn contents without negative consequences. We carried out a greenhouse experiment with two eucalypt species (Eucalyptus globulus and Corymbia citriodora), treated with four Mn additions in the soil substrate (0, 50, 150 and 300 mg kg−1) for 18 weeks. Before harvest, shoot height and the chlorophyll a fluorescence parameters were assessed, then leaves, stems and roots were sampled, weighted and nutrients determined. Manganese addition increased height for both species while biomass production remained unchanged, even though foliar concentrations ranged from 600 to 800 mg kg−1 at the highest Mn in soil. High root-to-shoot translocation of Mn was observed, yet—contrary to our hypothesis—photochemical efficiency of photosystem II was barely affected, except for the slight decrease in C. citriodora under 300 mg kg−1 Mn. The capacity to accumulate high Mn in photosynthetic tissues without chlorophyll damage seems to be a feature of Mn tolerant species. Nutritional imbalances such as magnesium decrease due to Mn exposure was observed, but not enough to cause deficiency. Both eucalypt species were therefore tolerant to high Mn concentrations in soil, especially E. globulus, and have the potential to be employed in reforestation/afforestation of lands with high risk of Mn phytotoxicity.



中文翻译:

土壤锰有效性增加下球果桉和黄柠檬幼苗中锰的积累和耐性

锰(Mn)是一种营养物质,如果高于阈值浓度,则会导致植物毒性。酸性土壤容易产生过量的锰,在某些环境条件下可能会增加可利用性并加剧对植物的有害影响。除氧化应激外,过量的Mn通常会影响光合作用。然而,已知一些植物可以忍受高锰含量而不会带来负面影响。我们对两种桉树物种(桉树桉Corymbia citriodora)进行了温室实验,在土壤基质(0、50、150和300 mg kg -1)中添加了四种锰,处理了18周。收获前,请先测量苗高和叶绿素a评估荧光参数,然后对叶,茎和根进行采样,称重并确定营养素。即使在土壤中最高的锰含量下,叶面浓度在600至800 mg kg -1范围内,两种物种的锰添加量都增加了,而生物量的产生却保持不变。与我们的假设相反,观察到锰的高根到茎易位,但与我们的假设相反,光系统II的光化学效率几乎没有受到影响,只是在300 mg kg -1以下时柠檬酸梭菌略有下降锰 在无叶绿素破坏的光合组织中积累高锰的能力似乎是耐锰物种的特征。观察到营养失衡,例如由于锰暴露引起的镁减少,但不足以引起营养不足。因此,这两种桉树种均能耐受土壤中特别是小球藻中的高锰浓度,并且有潜力被用于造林/造林中具有高锰植物毒性风险的土地。

更新日期:2020-11-21
down
wechat
bug