Details

Autor(en) / Beteiligte

• Tripathi, Durgesh Kumar
• Singh, Swati
• Singh, Vijay Pratap
• Prasad, Sheo Mohan
• Dubey, Nawal Kishore
• Chauhan, Devendra Kumar

Titel

Silicon nanoparticles more effectively alleviated UV-B stress than silicon in wheat (Triticum aestivum) seedlings

Ist Teil von

• Plant physiology and biochemistry, 2017-01, Vol.110, p.70-81

Ort / Verlag

France: Elsevier Masson SAS

Erscheinungsjahr

2017

Link zum Volltext

Quelle

Elsevier ScienceDirect Journals Complete

Beschreibungen/Notizen

• The role of silicon (Si) in alleviating biotic as well as abiotic stresses is well known. However, the potential of silicon nanoparticle (SiNP) in regulating abiotic stress and associated mechanisms have not yet been explored. Therefore, in the present study hydroponic experiments were conducted to investigate whether Si or SiNp are more effective in the regulation of UV-B stress. UV-B (ambient and enhanced) radiation caused adverse effect on growth of wheat (Triticum aestivum) seedlings, which was accompanied by declined photosynthetic performance and altered vital leaf structures. Levels of superoxide radical and H2O2 were enhanced by UV-B as also evident from their histochemical stainings, which was accompanied by increased lipid peroxidation (LPO) and electrolyte leakage. Activities of superoxide dismutase and ascorbate peroxidase were inhibited by UV-B while catalase and guaiacol peroxidase, and all non-enzymatic antioxidants were stimulated by UV-B. Although, nitric oxide (NO) content was increased at all tested combinations, but its maximum content was observed under SiNps together with UV-B enhanced treatment. Pre-additions of SiNp as well as Si protected wheat seedlings against UV-B by regulating oxidative stress through enhanced antioxidants. Data indicate that SiNp might have protected wheat seedlings through NO-mediated triggering of antioxidant defense system, which subsequently counterbalance reactive oxygen species-induced damage to photosynthesis. Further, SiNp appear to be more effective in reducing UV-B stress than Si, which is related to its greater availability to wheat seedlings. [Display omitted] •UV-B adversely affects growth of wheat seedlings.•It has occurred due to enhanced oxidative stress and damage in wheat.•Si and SiNp both protect wheat seedlings against UV-B•SiNps appear to be more effective in alleviating UV-B stress than Si.•Nitric oxide signaling appear to play a crucial role in regulating UV-B stress in wheat.