Response of silicon on metal accumulation, photosynthetic inhibition and oxidative stress in chromium-induced mustard (Brassica juncea L.)
2017
Ashfaque, F. | Inam, A. | Inam, A. | Iqbal, S. | Sahay, S.
Silicon plays an important role in the amelioration of heavy metal stress. We have examined the effects of exogenously applied Si (500μM and 700μM) in the metal accumulation, photosynthetic protection, and oxidative stress under chromium (Cr) stress in mustard (Brassica juncea L.) cv. Varuna. The experimental work was carried out in the naturally illuminated green house in the Department of Botany, Aligarh Muslim University, Aligarh. Plants grown with Cr (100μM) alone revealed increased oxidative stress via enhancement in H2O2 content and lipid peroxidation. Si protects the plant under Cr stress by reducing transportation of Cr from root to aerial part and also protected photosynthetic activity through increased activity of the net photosynthetic rate, chlorophyll, and carotenoid content. Application of 700μM Si significantly alleviated the Cr-induced photosynthetic inhibition oxidative stress more than 500μM Si. The treatment of Si increased proline and ascorbate content which might help increase photosynthetic and growth attributes.
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