Heat-induced Leaf Senescence in Creeping Bentgrass Suppressed by Aminoethoxyvinylglycine Involving Regulation of Chlorophyll Metabolism

Heat stress-induced or stress-accelerated leaf senescence is related to the accumulation of ethylene and loss chlorophyll in cool-season grass species. The objective this study was determine whether foliar-spraying inhibitor, aminoethoxyvinylglycine (AVG), may suppress heat-induced through effects on synthesis degrading enzymes creeping bentgrass ( Agrostis stolonifera ). Plants were maintained environmentally controlled growth chambers under non-stress (22/17 °C day/night) heat stress (35/30 temperature conditions for 25 days, turf quality, electrolyte leakage, content measured assess extent senescence. Activities chlorophyll-synthesizing chlorophyll-degrading quantified AVG regulate metabolism. foliar-sprayed with µ m before during at 7-day intervals. From 21 days stress, AVG-treated plants had significantly higher quality content, whereas leakage lower comparison untreated controls. activity a enzyme, porphobilinogen deaminase, increased stress. treated from 14 peroxidase, pheophytinase, chlorophyllase. have suppressed by regulating metabolic activities