Exogenously supplied silicon (Si) improves cadmium tolerance in pepper (Capsicum annuum L.) by up-regulating the synthesis of nitric oxide and hydrogen sulfide.

Author(s) Kaya, C.; Akram, N.Aisha; Ashraf, M.; Alyemeni, M.Nasser; Ahmad, P.
Journal J Biotechnol
Date Published 2020 Jun 10

The current research was aimed to observe the interactive role of silicon-generated hydrogen sulfide (HS) and nitric oxide (NO) on tolerance of pepper (Capsicum annum L.) plants to cadmium (Cd). Thus, the pepper plants were subjected to control (no Cd) or cadmium stress with and without Si supplementation. Significant decreases were found in plant dry weights, water potential, PSII maximum efficiency, glutathione (GSH), total chlorophyll, relative water content, Ca and K concentrations and ascorbate, but there was a significant increase in HO, MDA, electron leakage (EL), proline, key antioxidant enzymes' activities, and endogenous Cd, NO and HS in the Cd-stressed plants. Silicon enhanced Cd tolerance of the pepper plants by lowering the leaf Cd concentration, oxidative stress, enhancing the antioxidant defence system, leaf Si content, photosynthetic traits and plant growth as well as the contents of NO, proline and HS. Furthermore, foliar-applied NO scavenger, cPTIO, and that of HS, hypotaurine (HT), significantly decreased the levels of HS alone, but cPTIO effectively reduced the concentrations of NO and HS accumulated by Si in the Cd-stressed plants. The positive effect of Si was eliminated by cPTIO, but not by HT, suggesting that both molecules were involved in Si-induced improvement in Cd tolerance of the pepper plants.

DOI 10.1016/j.jbiotec.2020.04.008
ISSN 1873-4863
Citation J Biotechnol. 2020;316:3545.

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