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Effects of sodium, potassium and calcium on salt‐stressed barley. I. Growth analysis
Author(s) -
Cramer Grant R.,
Epstein Emanuel,
Läuchli André
Publication year - 1990
Publication title -
physiologia plantarum
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.351
H-Index - 146
eISSN - 1399-3054
pISSN - 0031-9317
DOI - 10.1111/j.1399-3054.1990.tb04378.x
Subject(s) - relative growth rate , salinity , photosynthesis , hordeum vulgare , potassium , sodium , limiting , chemistry , growth rate , botany , horticulture , zoology , assimilation (phonology) , poaceae , agronomy , biology , ecology , organic chemistry , mechanical engineering , linguistics , geometry , mathematics , philosophy , engineering
Barley ( Hordeum vulgare L. cv. CM 72) was grown for a 28‐day period and stressed with treatments of 125 mol m −3 NaCl or KC1 with low Ca 2+ (0.4 mol m −3 Ca 2+ ) or high Ca 2+ (10 mol m −3 Ca 2+ ). Plants were harvested periodically so that relative growth rate (RGR), net assimilation rate (NAR) and leaf area ratio (LAR) could be calculated using the functional approach to plant growth analysis. Relative growth rate declined with time for all treatments, including controls. Salinity inhibited RGR relative to control values by day 10. High Ca 2+ improved the growth of salt‐stressed plants in both NaCl‐salinity and KCl‐salinity. KC1 proved more toxic than NaCl, especially for KCI‐salinity plants with low Ca 2+ , which died by day 28. Net assimilation rate, but not LAR, was highly correlated with RGR for all treatments. This indicates that the photosynthetic‐assimilatory machinery was limiting RGR and not the leaf area of the plant.