Anti-senescence Activity of Chemicals Applied to Kentucky Bluegrass

Abstract

<jats:p>This study was conducted to determine the potential anti-senescence activity of certain chemicals by monitoring changes in gross. CO<jats:sub>2</jats:sub> exchange with senescence of excised leaves of Kentucky bluegrass <jats:italic>(Poa pratensis</jats:italic> L.). One day following foliar applications of benzyladenine (BA), triadimefon, and propiconazole, with and without chelated Fe (8% Fe phosphate citrate), Kentucky bluegrass leaves were excised, floated on distilled water in petri dishes, and placed in a darkened growth chamber. Gross CO<jats:sub>2</jats:sub> exchange rates (CER) were recorded 1, 4, 7, and 10 days after excision (DAE). Foliar applications of Fe, BA, triadimefon, or propiconazole applied alone induced an anti-senescence response. Combinations of Fe with the chemicals delayed excision-induced leaf senescence, but no significant increase in anti-senescence activity was obtained from the Fe and chemical combinations as compared to the materials applied alone. Chemical names used: N-(phenylmethyl)-1H-purin-6-amine (benzyladenine, BA); 1-(4-Chlorophenoxy)-3,3-dimethyl-1(1H-1,2,4-triazol-1yl)-2-butanone (triadimefon);1-[[2-(2,4-dichlorophenyl)-4-propyl-1,3-dioxolan-2-yl]methyl]-1H-1,2,4-triazole (propiconazole).</jats:p>

Effect of Foliar-Applied Humic Acid to Dry Weight and Mineral Nutrient Uptake of Maize under Calcareous Soil Conditions

“…Spraying with fulvic acid increased the yield of wheat grown at dry conditions to 97% of the irrigated control (Xudan 1986). In semi-arid conditions, foliar application with humic acid represented an alternative to conventional soil fertilization (Delfine et al 2005), stimulated shoot and root growth, and improved resistance to environmental stress in plants (Goatley and Schmidt 1990). Under water stress, foliar fertilization with humic molecules increased leaf water retention and the photosynthetic and antioxidant metabolism (Jiu, Qi, and Sheng 1995).…”

Optimizing Dosages of Seaweed Extract‐Based Cytokinins and Zeatin Riboside for Improving Creeping Bentgrass Heat Tolerance

“…Exogenous cytokinins have been shown to increase endogenous cytokinin content, and NR and to improve plant stress tolerance. Goatley and Schmidt (1990) reported that foliar application of 6‐benzyladenine (6‐BA) delayed senescence of Kentucky bluegrass ( Poa pratensis L.). Liu et al (2002) noted that rootzone injection of zeatin riboside increased endogenous cytokinins and antioxidant activity and delayed senescence in heat‐stressed creeping bentgrass.…”

Impact of Seaweed Extract‐Based Cytokinins and Zeatin Riboside on Creeping Bentgrass Heat Tolerance

“…Thimann (1987) found that cytokinins delay senescence processes probably by maintaining the integrity of the tonoplast membrane. Goatley and Schmidt (1990) reported that foliar application of 6-benzyladenine (6-BA) delayed senescence of Kentucky bluegrass. Liu et al (2002) noted that rootzone-injection of zeatin riboside increased endogenous cytokinins, antioxidant activity, and delayed senescence in heat-stressed creeping bentgrass.…”