Uptake and translocation of Cd and Zn in two lettuce cultivars

Abstract

Excess of heavy metals in agricultural soils is a matter of concern since it may decrease economic yield as a result of toxicity and lower product quality as a result of metal accumulation in edible plant parts. Among plant species and among cultivars within species a natural variation in uptake, translocation and distribution of trace elements occur. The transference of Cd and Zn, from soil to two lettuce (Lactuca sativa L.) cultivars grown in greenhouse, was evaluated in separate experiments for Cd and Zn.Plant dry and fresh matter yield and plant Cd and Zn concentrations were determined. Cultivar CRV showed greater potential for yield than CMM in both experiments. Cadmium and Zn translocation from roots to shoots increased with the increase of soil Cd or Zn, for both cultivars. There was Cd translocation from young to old leaves in CMM but not in CRV whereas for Zn it occurred in both cultivars, being higher in CRV. In both cultivars, old leaves had higher Cd and Zn concentrations (and lower dry matter yield) than young leaves. The CRV and CMM cultivars accumulate Cd differently in the leaves and the higher accumulation occurs in the former. Cultivar CRV also accumulates more Zn compared to CMM.

Solubility and availability of micronutrients extracted from silicate agrominerals

“…Therefore, agrominerals released a very low amount of the nutrient compared with its total content; however, soluble Zn, even in small concentrations, is readily taken up by plants. In contrast, Fontes et al (2014) found that increasing doses of Zn in the soil from 0 to 36 mg dm -3 caused a linear decrease in lettuce dry matter, but that Zn content increased from 0.1 to 1.25 mg kg -1 in the shoots; the highest dose used by these authors can be compared with the control of the present study.…”

Role of antioxidants in the protection against the combined effect of Cd, Zn, and Ni in wheat

“…At the high concentrations of metals in roots, tissues of the sort Kuial'nik seedlings showed an increase in the quantity of the cadmium accumulation amounted to 7.7, and those of Sonechko -8.7. A similar effect was observed in work [13] by Fontes et al, while studying two lettuce (Lactuca sativa L.) cultivars. Specifically, a significantly higher level of cadmium and zinc accumulation was observed for the cultivar CRV compared with the cultivar CMM.…”

Cerium Oxide Nanoparticles Affect Heavy Metals Uptake by Pea in a Divergent Way than Their Ionic and Bulk Counterparts

“…Once in the plant body, zinc ions are further stabilized by several processes of which those involving phytochelatins are generally acknowledged (Prasad and Hagemeyer 1999;Rauser 1999;Viehweger 2014). However, other mechanisms such as complexation with organic acids have been also identified (Fontes et al 2014). Iron and manganese are important elements essential for the proper plant growth.…”