Assessment of elevated CO2 concentrations and heat stress episodes in soybean cultivars growing in heavy metal polluted soils: Crop nutritional quality and food safety. (15th June 2022)

• Record Type: Journal Article
• Authors: Blanco, Andrés; Högy, Petra; Zikeli, Sabine; Pignata, María L.; Rodriguez, Judith H.
• Is Part Of: Environmental pollution. Volume 303(2022)
• Publication Date: 2022-06-15
• Subjects: Glycine max -- Climate change -- Pb and Cd contamination -- Seed quality -- Food security; ANOVA analysis of variance -- Bw body weight -- CS concentration of a HM in soybean seeds -- DW dry weight -- EDI estimated dietary intake -- FA fatty acid -- GC gas chromatography -- HI hazard index -- HM heavy metal -- HS heat stress -- ICP-OES inductively coupled plasma optical emission spectrometry -- ICP-MS inductively coupled plasma optical mass spectrometry -- ppm parts per million -- PSI photosystem I -- PSII photosystem II -- RfD reference oral dose -- SPAD soil plant analysis development chlorophyll meter -- TF translocation factor -- THQ target hazard quotient; Pollution -- Periodicals; Pollution -- Environmental aspects -- Periodicals; Environmental Pollution -- Periodicals; Pollution -- Périodiques; Pollution -- Aspect de l'environnement -- Périodiques; Pollution -- Effets physiologiques -- Périodiques; Pollution; Pollution -- Environmental aspects; Periodicals; Electronic journals; 363.73
• DOI: 10.1016/j.envpol.2022.119123
• Languages: English
• ISSNs: 0269-7491

Abstract

Abstract: The present study evaluated the interactive effects of global change and heavy metals on the growth and development of three soybean [ Glycine max (L.) Merrill] cultivars and the consequences on yield and food safety. Soybean cultivars (Alim 3.14 from Argentina, and ES Mentor and Sigalia, from Germany) were grown until maturity in heavy metals polluted soils from the Rhine Valley, Germany, at two CO2 concentrations (400 and 550 ppm) and heat stress (HS) episodes (9 days with 10 °C higher than maximum regular temperature) during the critical growth period in controlled environmental chambers. Different morpho-physiological parameters, heavy metal concentration in aerial organs, seed quality parameters, and toxicological index were recorded. The results showed that no morphological differences were observed related to CO2 . Moreover, Alim 3.14 showed the highest yield under control conditions, but it was more sensitive to climatic conditions than the German cultivars, especially to heat stress which strongly reduces the biomass of the fruits. Heavy metals concentration in soil exceeds the legislation limits for agricultural soils for Cd and Pb, with 1.6 and 487 mg kg −1 respectively. In all cultivars, soybeans accumulated Cd in its aerial organs, and it could be translocated to fruits. Cd concentration in seeds ranged between 0.6 and 2.4 mg kg −1, which exceed legislation limits and with toxicological risk to potential Chinese consumers. Pb levels were lower than Cd in seeds (0.03–0.17 mg kg −1 ), and the accumulation were concentrated in the vegetative organs, with 93% of the Pb incorporated. Moreover, pods accumulated 11 times more Pb than seeds, which suggests that they act as a barrier to the passage of Pb to their offspring. These results evidence that soybean can easily translocate Cd, but not Pb, to reproductive organs. No regular patterns were observed in relation to climatic influence on heavy metal uptake. Graphical abstract: Image 1 Highlights: A climate chamber experiment with soybeans grown in Cd–Pb polluted soil were performed. Cd translocation to seeds were efficient in all studied soybean's cultivars. German soybeans showed tolerance to climate change conditions. Heat stress episodes reduced yield and Pb–Cd accumulation in Argentinian cultivars. Elevated CO2 not evidence differences in heavy metals accumulation in soybean.