Reddy Mageshni, Moodley Roshila, Jonnalagadda Sreekanth B
School of Chemistry & Physics, Westville campus, College of Agriculture, Engineering and Science, University of KwaZulu-Natal, Durban, 4000, South Africa.
Environ Monit Assess. 2014 Jul;186(7):4519-29. doi: 10.1007/s10661-014-3716-7. Epub 2014 Mar 27.
The distribution of 14 elements (both essential and non-essential) in the Hass and Fuerte cultivars of avocados grown at six different sites in KwaZulu-Natal, South Africa, was investigated. Soils from the different sites were concurrently analysed for elemental concentration (both total and exchangeable), pH, organic matter and cation exchange capacity. In both varieties of the fruit, concentrations of the elements Cd, Co, Cr, Pb and Se were extremely low with the other elements being in decreasing order of Mg > Ca > Fe > Al > Zn > Mn > Cu > Ni > As. Nutritionally, avocados were found to be a good dietary source of the micronutrients Cu and Mn. In soil, Pb concentrations indicated enrichment (positive geoaccumuluation indices) but this did not influence uptake of the metal by the plant. Statistical analysis was done to evaluate the impact of soil quality parameters on the nutrient composition of the fruits. This analysis indicated the prevalence of complex metal interactions at the soil-plant interface that influenced their uptake by the plant. However, the plant invariably controlled metal uptake according to metabolic needs as evidenced by their accumulation and exclusion.
对在南非夸祖鲁 - 纳塔尔省六个不同地点种植的哈斯（Hass）和富埃尔特（Fuerte）品种鳄梨中14种元素（包括必需元素和非必需元素）的分布情况进行了研究。同时对不同地点的土壤进行了元素浓度（总量和交换性）、pH值、有机质和阳离子交换容量的分析。在这两个品种的果实中，镉（Cd）、钴（Co）、铬（Cr）、铅（Pb）和硒（Se）的浓度极低，其他元素的含量顺序为镁（Mg）>钙（Ca）>铁（Fe）>铝（Al）>锌（Zn）>锰（Mn）>铜（Cu）>镍（Ni）>砷（As）。从营养角度来看，鳄梨是微量营养素铜和锰的良好膳食来源。在土壤中，铅的浓度显示出富集（正地累积指数），但这并未影响植物对该金属的吸收。进行了统计分析以评估土壤质量参数对果实营养成分的影响。该分析表明在土壤 - 植物界面存在复杂的金属相互作用，影响了植物对它们的吸收。然而，植物总是根据代谢需求控制金属吸收，这从它们的积累和排除情况得到证明。
