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Physiological Responses of Creeping Bentgrass Cultivars to Carbonate, Chloride, and Sulfate Salinity
Author(s) -
Yu Qiao,
Chang Zhihui,
Li Deying
Publication year - 2013
Publication title -
crop science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.76
H-Index - 147
eISSN - 1435-0653
pISSN - 0011-183X
DOI - 10.2135/cropsci2012.09.0555
Subject(s) - agrostis stolonifera , salinity , salt (chemistry) , cultivar , sodium , chlorophyll , chlorophyll a , zoology , chemistry , botany , horticulture , biology , poaceae , ecology , organic chemistry
Evaluation of creeping bentgrass ( Agrostis stolonifera L.) salt tolerance often showed inconsistent results. The objective of this study was to investigate the reactions of ‘Seaside II’ and ‘T‐1’ to NaCl, Na 2 CO 3 , Na 2 SO 4 , and CaCl 2 , each at concentrations of 0, 25, 75, 125, 175, and 225 mM. Chlorophyll a (Chl a ) content was the lowest in the CaCl 2 treatment followed by Na 2 CO 3 and Na 2 SO 4 and highest in NaCl whereas chlorophyll b (Chl b ) content was lowest in Na 2 CO 3 followed by CaCl 2 and Na 2 SO 4 and highest in NaCl. Turfgrass visual quality and green density were reduced the most by the Na 2 CO 3 and CaCl 2 treatments. Evapotranspiration (ET) decreased in the order of treatments CaCl 2 , Na 2 SO 4 , Na 2 CO 3 , and NaCl at 1 wk after treatment (WAT), but at 4 WAT there were no difference among CaCl 2 , Na 2 SO 4 , and Na 2 CO 3 . Significant salt type × concentration interaction existed, and the first order or second order coefficient of regression equation ranked the changing rate of physiological parameters differently in different salts. Leaf K + :Na + ratio was affected differently by salts and a threshold of 1 appeared at different salt concentrations depending on salt types and cultivars. The pH, osmotic potential, and electrical conductivity of salt solutions were confounded making the interpretation of mechanisms of physiological stress difficult. Nevertheless, this study showed that different salts rank creeping bentgrass salt tolerance differently.