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Biotechnology Development in Nigeria
Published in Sylvia Uzochukwu, Nwadiuto (Diuto) Esiobu, Arinze Stanley Okoli, Emeka Godfrey Nwoba, Christpeace Nwagbo Ezebuiro, Charles Oluwaseun Adetunji, Abdulrazak B. Ibrahim, Benjamin Ewa Ubi, Biosafety and Bioethics in Biotechnology, 2022
A. Akpa, N. C. Ezebuiro, Benjamin Ewa Ubi, Christie Onyia, Abdulrazak Ibrahim
Aeroponics involves growing plants in the air or environment of mist. It does not require soil or an aggregate intermediate. Nutrient that is required for plant growth is transmitted through water. Operationally, the growing plant is suspended in a complete or partial enclosure and the dangling root is sprayed with nutrient-rich water. Vegetables such as lettuces and crops such as maize, potatoes, and yam could be grown using aeroponics (Mehandru et al., 2014).
Breeding the hyperaccumulator Noccaea caerulescens for trace metal phytoextraction: first results of a pure-line selection
Published in International Journal of Phytoremediation, 2019
Thibault Sterckeman, Yannick Cazes, Catherine Sirguey
The increase in Cd content in the rosette at FBV over generations suggests a positive effect of the selection of Cd hyperaccumulating individual plants. However, the benefit of selection appeared to erode with the plant growth as shoot Cd content was lower when the plant fructified, giving the appearance of a dilution of the Cd content in the increasing shoot biomass. This dilution effect seemed to increase from F1 to F3. This is contradictory to the results of Lovy et al. (2013) who observed no difference in Cd accumulation whatever the stage of the plant. However, these authors cultivated N. caerulescens in aeroponics with no limitation in the Cd offer (i.e. with constant Cd content in nutrient solution). In this study, the accumulation of Cd in the shoot at the fructification stage seemed to tend towards a limit. Two hypotheses may explain this phenomenon. One is that the processes which lead to Cd content in the fructifying shoot at FRR are different to those that control Cd content in the rosette at FBV and that the former was not the object of selection as the latter were. The second hypothesis is that the soil Cd offer limited the plant uptake because of the depletion of the rhizosphere as the plant grew (Lin et al. 2016). In the early stages, as the plant produced numerous new roots, the soil offer was sufficient to provide them with Cd according to the plant demand, whatever its genotype. With time, the rhizosphere of the dominating old roots was depleted in Cd and the uptake was controlled by Cd diffusion in soil, which is slow and limiting (Degryse et al. 2012), as it does not correspond to the flux required to maintain constant the Cd content of the growing shoot.