Plant Growth Regulator and Soil Surfactants’ Effects on Saline and Deficit Irrigated Warm‐Season Grasses: II. Pigment Content and Superoxide Dismutase Activity

Autor: Bernd Leinauer, Bernd Maier, Rossana Sallenave, Marco Schiavon, Matteo Serena
Rok vydání: 2014
Předmět:
Zdroj: Crop Science. 54:2827-2836
ISSN: 1435-0653
0011-183X
Popis: Drought conditions on turf areas are frequent in the Southwest due to limited rainfall and a short- age of potable irrigation water. A study was con- ducted at New Mexico State University in Las Cruces, NM during the summers of 2010 to 2012 to determine bermudagrass (Cynodon dactylon L.) cultivar Princess 77 and seashore paspalum (Paspalum vaginatum Swartz) cultivar Sea Spray treated with either a soil surfactant (Revolution (modified methyl capped block copolymer)) or a plant growth regulator (PGR) (Trinexapac-ethyl (TE); 4-(cyclopropylhydroxymethylene)-3,5-di- oxocyclohexanecarboxylic acid) response to drought stress. Plots were irrigated at 50% refer- ence evapotranspiration with either saline (elec- trical conductivity (EC) = 02.3 dS m 1 ) or potable (0.6 dS m 1 ) water from either a sprinkler or sub- surface drip irrigation (SDI) system. Chlorophyll a and b and carotenoids content and superoxide dismutase activity (SOD) in leaves and stolons were measured monthly to assess response to turf stress. Princess 77 plots treated with TE showed the highest chlorophyll and carotenoids content (15.7 and 6.0 µg g 1 fresh weight (FW), respectively) and greatest SOD activity in leaves (37.7 units mg 1 proteins). Both grasses under SDI had higher pigment content at the end of the study than sprinkler-irrigated grasses, sug- gesting that SDI may be more effective than sprinkler under deficit evapotranspiration (ET) replacement conditions. Only a weak correla- tion was found between chlorophyll content and either Normalized Difference Vegetation Index (NDVI) or visual ratings.
Databáze: OpenAIRE
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