Heat Stress Injury in Relation to Membrane Lipid Peroxidation in Creeping Bentgrass

• DOI: 10.2135/cropsci2000.402503x
• Publication Date: 2010-07-29T15:47:29Z
• Authors: Xiaozhong Liu; Bingru Huang
• Keywords: Agrostis; Malondialdehyde

Understanding physiological and biochemical factors involved in heat‐stress injury would help improve heat tolerance of cool‐season grasses. The objective this study was to investigate lipid peroxidation cell membranes relation creeping bentgrass ( Agrostis palustris Huds.). Two cultivars differing tolerance, L‐93 (heat tolerant) Penncross sensitive) were grown under two temperature regimes: 22/16°C (day/night) 35/25°C for 56 d growth chambers. Photochemical efficiency (Fv/Fm) chlorophyll content leaves; electrolyte leakage (EL); the product, malondialdehyde (MDA); activities antioxidant enzymes including superoxide dismutase (SOD), catalase (CAT), peroxidase (POD) leaves roots determined biweekly during stress. Leaf Fv/Fm ratio decreased, whereas EL MDA contents both increased stress cultivars, but a greater extent Penncross. SOD CAT POD activity roots, which occurred increases than cultivars. These results suggest that decreased could result an level peroxidation. Thus, contribute damage leaf senescence as demonstrated by reduced Fv/Fm, Cultivar variations enzyme associated with their differences evidenced ratio, content, EL.