Investigating the effect of silicon on some growth and physiological parameters of rapeseed (Brassica napus L.) under arsenic and cadmium stress

Subject Areas : Tension

Nasser Karimi ¹ , Salimeh Khademi Azam ² , Zahra Souri ³

1 - Nanobiotechnology Laboratory, Department of Biology, Razi University, Kermanshah, Iran Department of Biology, Faculty of Science, Razi University, Kermanshah, Iran
2 - Department of Biology, Faculty of Science, Razi University, Kermanshah, Iran
3 - Department of Biology, Faculty of Science, Razi University, Kermanshah, Iran

Received: 2024-04-09 Accepted : 2024-06-14 Published : 2024-12-04

Keywords: Growth parameters, Silicon, Heavy metal, Brassica napus L.,

Abstract :

Silicon, being the second most abundant element in the soil and the earth's crust, has been shown to possess the ability to promote plant growth and enhance plant response to stress factors such as heavy metals. To investigate the impact of silicon on various growth and physiological parameters of rapeseed (Brassica napus) under arsenic and cadmium stress, a factorial experiment was conducted in the form of a completely randomized design with three replications. After reaching the four-leaf stage, plants were treated with 600 µM arsenic and cadmium and 0, 0.5, 1 and 2 mM silicon for 14 days. The results showed that cadmium was more accumulated than arsenic in the aerial part of rapeseed, so it had significant toxic effects on plant growth parameters. Compared to the single treatment of arsenic or cadmium, silicon supplementation, especially in the 2 mM treatment, decreased hydrogen peroxide content and, on the contrary, increased the activity of glutathione S-transferase. In general, silicon improves the plant healing potential and resistance of rapeseed by improving growth factors, reducing heavy metal uptake, and oxidative stress damage. Therefore, silicon can enhance crop production and increase plants' resistance to heavy metal stress.

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