Physiological behaviour of four rapeseed cultivar (Brassica napus L.) submitted to metal stress

Abstract

Eliminating heavy metals in the environment by phytoremediation is a method that uses, generally, plants with a low biomass yielded and feeble depth of root system. For the purpose of improving this technique, we have tested four varieties of productive specie with high yields, the rapeseed (Brassica napus L.). In particular, we have studied metal stress effect on biomass, growth, and endogenous Zn and Cd content. Metal treatment caused significant dry weight differences between metal-treated and control plants. A significant genotypic difference has been noticed between the four cv. For two varieties, Jumbo and Drakkar, the accumulation is more important in the stems and petioles, whereas, this accumulation is at a maximum level in the root system for the two varieties, Cossair and Pactol. Chlorophyll and carotenoïd content, as well as lipid peroxidation, known as stress markers, were also evaluated. Metal treatment led to an increase in the amount of malondialdehyde (MDA) in the leaves. However, the increase of Zn and Cd levels in the tissue culture was followed by a decrease in the photosynthetic pigments. To cite this article: A.

Green Technology for Remediation of Water Polluted with Petroleum Crude Oil: Using of Eichhornia crassipes (Mart.) Solms Combined with Magnetic Nanoparticles Capped with Myrrh Resources of Saudi Arabia

“…These findings were, however, inconsistent with the increase in catenoid levels in R. sativus L. subjected to crude oil stress [30]. The reduction in carotenoid levels may be the result of the production of reactive oxygen species (ROS) due to oil-induced stress [35] or referred to the disruption of the plant's ability to accumulate pigment-lipoprotein complexes such as photosystem I [36]. These data were also observed as illustrated in the surface morphologies of plant photos ( Figure 9) before and after treatment with different crude oil contaminates.…”

Seed priming with calcium chloride improves the photosynthesis performance of faba bean plants subjected to cadmium stress

“…Therefore, the decrease in plant growth might be due to Cd-induced toxicity on photosynthetic apparatus (Bashir et al 2015, Moradi andEhsanzadeh 2015) and/or structural alterations in plants (Nouairi et al 2006, Belkhadi et al 2010. Decrease in plant growth and biomass might also be due to oxidative damage and reduction in antioxidant enzymes activities (Ahmad et al 2009) and/or reduction in mineral nutrients uptake by plants (Ben Ghnaya et al 2009). It might be assumed that this decrease in plant growth could be due to the reduced cell expansion (Daud et al 2013), decrease of Calvin-cycle enzymes, inhibition of the photosynthetic electron transport chain, and might also be due to Cd-induced inhibition in gas-exchange characteristics and Chl contents (Ali et al 2014, Per et al 2016.…”

Studies on Seed Germination in Capsicum Seeds (Solan Bharpur) under Abiotic Stress

“…A reduction in chlorophyll synthesis (caused by the inhibition of the respective enzymes), increased chlorophyll destruction or affected element uptake (either by inhibition of the uptake or by competition with other heavy metals). Other causes for affected photosynthesis function include the inhibition of the Calvin cycle, reducing CO 2 fixation, the reduced aggregation of pigment protein complexes of the photosystems and general ROS induced damage to the chloroplasts [17], [18]. Most of the effects of heavy metals in chlorophyll are based on the measurement of the contents of this pigment and this leads to most authors justifying its decrease due to the inhibition of the enzymes responsible for its synthesis, although this conclusion is usually based on indirect evidence.…”