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- W2040339218 abstract "Abstract This study was designed to investigate physiological responses of creeping bentgrass (Agrostis palustris Huds.) to foliar application of nutrients under heat stress. “Penncross” plants were exposed to two temperature regimes in growth chambers: optimum temperature control (20/15°C, day/night) and heat stress (35/30°C). A 10 mL solution of CaCl2 (10 mM), KH2PO4 (10 mM), NH4NO3 (124 mM), or water (untreated control) was sprayed to the foliage of plants at 0, 14, and 28 d of heat stress. Turf quality, shoot growth rate, canopy net photosynthetic rate (P n ), leaf chlorophyll content, and photochemical efficiency (F v /F m ) declined during heat stress, regardless of nutrient treatments. The activities of superoxide dismutase (SOD), catalase (CAT), and hydrogen peroxidase (POD) were suppressed, but the content of a lipid peroxidation product, malondialdehyde (MDA) was increased with heat stress. Foliar application of CaCl2 and KH2PO4 helped to maintain a higher Fv /Fm , shoot growth rate, and turf quality than untreated plants. Foliar application of NH4NO3 increased P n , chlorophyll content, F v /F m , and turf quality under heat stress. None of the nutrient solutions had significant effects on SOD activity during heat stress; however all three nutrients increased CAT and POD activity and reduced MDA content at different times of heat stress. These results demonstrated that foliar application CaCl2, KH2PO4, or NH4NO3 improved heat tolerance of creeping bentgrass to some extent by slowing leaf senescence and maintaining photosynthetic activities. The alleviating effects of foliar application of CaCl2, KH2PO4, or NH4NO3 on heat injury in creeping bentgrass was related to the maintenance of the scavenging ability of antioxidants and inhibition of lipid peroxidation." @default.
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- W2040339218 date "2003-03-01" @default.
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- W2040339218 title "Effects of Foliar Application of Nutrients on Heat Tolerance of Creeping Bentgrass" @default.
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- W2040339218 doi "https://doi.org/10.1081/pln-120016498" @default.
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