Ameliorating Effect of Silicon on Growth Vigor, Physiological and biochemical Traits of Salinized Canola Seedlings (Brassica napus L.) | ||
| Catrina: The International Journal of Environmental Sciences | ||
| Article 13, Volume 18, Issue 1, March 2019, Pages 125-137 PDF (756.19 K) | ||
| Document Type: Original Article | ||
| DOI: 10.21608/cat.2019.28622 | ||
| Author | ||
| Rasha M. El-Shazoly* | ||
| Botany and Microbiology Department, Faculty of Science, New Valley University, 72511, Al-Kharja, New Valley, Egypt | ||
| Abstract | ||
| In the present study the ameliorating effects of Si nutrition supplied as 1 mmol L−1 sodium silicate were proved on the seedling growth of canola (Brassica napus L.) seedlings under salinity stress (i.e. 0, 30, 60, 90 and 120 mmol L−1sodium chloride). Salinity obviously disrupted cellular homeostasis, something was evident in the decreased percent of scavenging HO-free radical and Metal chelating %, and hence reduction in photosynthetic pigments contents (chl.a and carotenoids). Silicon nutrition, however, enabled canola cells to balance between the steady-state levels of different ROS through improving the detoxification of the excess ROS. This was prevalent in higher scavenging percent of HO- and metal chelating. In addition, Si maintained membranes integrity through improved levels of lipid peroxidation inhibition %. Si buffered oxidative stress through sustaining the enzymatic and non-enzymatic scavenging capacity of reactive oxygen species in salt-stressed plants. Enzymatic antioxidants such as (CAT, SOD, APX, and POS) activities as well as non-enzymatic antioxidants such as carotenoids contents phenolics contents increased at 120 mmol L−1 sodium chloride. Thus, silicon nutrition alleviated the deleterious effects of salinity on the growth of canola plants through increased reactive oxygen species scavenging capacity (enzymatically and non-enzymatically), maintaining the membrane integrity of seedling cells as evidenced by raising the reducing power contents, sustained higher levels of chlorophyll. Consequently, enhance seedlings growth observations. | ||
| Keywords | ||
| salinity; silicon; Antioxidant enzymes; lipid peroxidation inhibition%; HO radical scavenging %; metal chelating % | ||
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