Effects of sodium, potassium and calcium on salt-stressed barley. II. Elemental analysis

摘要: Cramer, G. R., Epstein, E. and Lauchli, A. 1991. Effects of sodium, potassium apdcalcium on salt-stressed barley. !I. Elemental analysis. - Physiol. Plant. 81; 197-202.We grew bariey (Hordeum vulgare L. CM 72) for a 28-day period sequentiallyharvested plants every 3 or 4 days. Plants were with either NaCI KCl(125 mM) without supplemental Ca (10 0,4 mM final concentration,respectively). We determined tissue concentrations Na, Ca, Mg, K, S, P, Fe, Mn,Cu Zn each harvest date by inductively coupled plasma spectrometry. Uptake(specific absorption rate) was calculated from the element content growth rates.Salinity had significant effects uptake most elements.Mg Mn declined time. The all otherelements increased over Element root dry weight basisdeclined Three variables significantly affected salinity corre-lated growth; 1) concentration, 2) total sum cation concentra-tion (TC), 3) concentration shoot. Salinity reduced andconcentrations. Supplemental positivelycorrelated during salt stress. doubled TC, which negativelycorrelated relative rate (RGR), Relative at TCvalues above 150 mM. Mn. Manga-nese in shoot highly correlated RGR. growthrate below 50 nmol (g fresh weight) ',Key words Barley, Hordeum vulgare, Mn, Na-Ca interactions, salinity,uptake.G, R, Cramer (corresponding author), Dept Ptant Science, Univ, Nevada, Reno,NV 89557, USA; Epstein Land, Air Water Resources,Univ, California, Davis, CA 95616, USA.