Silicon Pretreatment Alleviates Drought Stress and Increases Antioxidative Activity in Kentucky Bluegrass. Issue 1 (19th October 2017)

• Record Type: Journal Article
• Authors: Bae, Eun‐Ji; Hong, A‐Reum; Choi, Su‐Min; Lee, Kwang‐Soo; Park, Yong‐Bae
• Is Part Of: International Turfgrass Society Research Journal. Volume 13:Issue 1(2017)
• Page Start: 591
• Page End: 600
• Publication Date: 2017-10-19
• Subjects: 635.9
• DOI: 10.2134/itsrj2017.01.0059
• Languages: English
• ISSNs: 1817-0641

Abstract

Abstract : Drought is an important environmental stress that adversely affects plant growth and causes a reduction in growth. Despite the expanded areas of use and the increasing usefulness of the turfgrass, research on the drought stress on turfgrass is still insufficient, and there have only been few studies that investigated the effects of silicon on the drought resistance of turfgrass. This study was performed to determine the effects of silicon on Kentucky bluegrass ( Poa pratensis L.) after the application of drought stress. The daily amount of water or silicon solution was 250 mL per a pot. For 14 d, plants were treated with 0, 0.1, and 1.0 mM silicon solution for silicon treatments and with distilled water for the control. Afterward, the plants were exposed to a 21‐d drought treatment, but the control received water as usual. Compared with the control, application of silicon increased the fresh weight of shoots and roots, as well as water content. The silicon pretreatments before drought significantly decreased chlorophyll contents, electrolyte leakage, and the concentrations of malondialdehyde (MDA) and H2 O2 . However, the α, α‐diphenyl‐β‐picrylhydrazyl (DPPH) radical scavenging and glutathione (GSH) activities were significantly increased. Also, the responsive activities of the antioxidant enzymes encompassing superoxide dismutase (SOD), ascorbate peroxidase (APX), catalase, and peroxidase were significantly enhanced. Our results suggest that silicon could help Kentucky bluegrass perform better under drought stress by increasing their antioxidant activities while decreasing lipid peroxidation.