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Cadmium and lead affect the status of mineral nutrients in alfalfa grown on a calcareous soil
Soil Science and Plant Nutrition ( IF 2 ) Pub Date : 2020-04-06 , DOI: 10.1080/00380768.2020.1747362
Honghua He 1, 2 , Xia Wang 2, 3 , Miaomiao Wu 1 , Lei Guo 1 , Chenbin Fan 1 , Qi Peng 2, 3
Affiliation  

ABSTRACT Cadmium (Cd) and lead (Pb) are toxic trace elements which are not essential for plants but can be easily taken up by roots and accumulated in various organs, and cause irreversible damages to plants. A pot experiment was carried out to investigate the individual and combined effects of Cd (0, 10, 20 mg kg−1) and Pb (0, 500, 1000 mg kg−1) level in a calcareous soil on the status of mineral nutrients, including K, P, Ca, Mg, S, Fe, Mn, Cu, and Zn, in alfalfa (Medicago sativa L.) plants. Soil Pb level considerably (P ≤ 0.05) affected the concentrations of more elements in plants than soil Cd level did, and there were combined effects of soil Cd level and Pb level on the concentrations of some nutrients (Ca, Mg, and Cu) in plants. The effects of soil Cd level and Pb level on plant nutrient concentrations varied among plant parts. Cd and Pb contamination did not considerably affect the exudation of carboxylates in the rhizosphere. An increase in rhizosphere pH and exudation of significant amounts of carboxylates (especially oxalate) in the rhizosphere might contribute to the exclusion and detoxification of Cd and Pb. Neither shoot dry mass nor root dry mass was significantly influenced by soil Cd level, but both of them were considerably reduced (by up to 25% and 45% on average for shoot dry mass and root dry mass, respectively) by increasing soil Pb level. The interaction between soil Cd level and Pb level was significant for root dry mass, but not significant for shoot dry mass. The results indicate that alfalfa is tolerant to Cd and Pb stress, and it is promising to grow alfalfa for phytostabilization of Cd and Pb on calcareous soils contaminated with Cd and Pb.

中文翻译:

镉和铅影响钙质土壤上生长的苜蓿中矿质养分的状况

摘要 镉(Cd)和铅(Pb)是对植物非必需但易被根部吸收并在各器官中积累的有毒微量元素,对植物造成不可逆转的损害。进行盆栽试验以研究钙质土壤中 Cd (0, 10, 20 mg kg-1) 和 Pb (0, 500, 1000 mg kg-1) 水平对矿质养分状况的单独和组合影响,包括 K、P、Ca、Mg、S、Fe、Mn、Cu 和 Zn,在苜蓿 (Medicago sativa L.) 植物中。土壤 Pb 水平(P ≤ 0.05)比土壤 Cd 水平显着影响植物中更多元素的浓度,并且土壤 Cd 水平和 Pb 水平对植物中某些养分(Ca、Mg 和 Cu)浓度的综合影响植物。土壤 Cd 水平和 Pb 水平对植物养分浓度的影响因植物部位而异。Cd 和 Pb 污染对根际中羧酸盐的渗出没有显着影响。根际 pH 值的增加和根际中大量羧酸盐(尤其是草酸盐)的渗出可能有助于排除和解毒 Cd 和 Pb。地上部干质量和根干质量均不受土壤 Cd 水平的显着影响,但通过增加土壤 Pb 水平,两者均显着降低(地上部干质量和根干质量分别平均高达 25% 和 45%) . 土壤Cd水平和Pb水平之间的相互作用对根干质量显着,但对地上部干质量不显着。结果表明,苜蓿对Cd和Pb胁迫具有耐受性,在被Cd和Pb污染的钙质土壤上种植苜蓿对Cd和Pb的植物稳定作用是有希望的。
更新日期:2020-04-06
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