
%0 Journal Article
%A Ball, MC 
%A Chow, WS 
%A Anderson, JM 
%T Salinity-Induced Potassium Deficiency Causes Loss of Functional Photosystem II in Leaves of the Grey Mangrove, <I>Avicennia marina</I>, Through Depletion of the Atrazine-Binding Polypeptide
%J Functional Plant Biology
%D 1987/06/01
%V 14
%N 3
%P 351-361
%K 
%R https://doi.org/10.1071/PP9870351
%U https://www.publish.csiro.au/paper/PP9870351 
%X Photosynthetic properties were studied in relation to the ionic composition of leaves of Avicennia marina grown in low and high salinity (i.e. 50 and 500 mol m-3 NaCl) nutrient solution containing either 0.01 or 10 mol m-3 K+. Leaves accumulated high concentrations of NaCl, but changes in photosynthesis were associated with changes in leaf K+ concentrations. The effects occurred at two levels. (1) With decrease in leaf K+ from 379 to 167 mol m-3, a 21% decline in light and CO2 saturated rates of oxygen evolution per leaf area was consistent with a 24% decrease in chlorophyll content. (2) Leaves containing only 103 mol m-3 K+ showed drastic loss of light and CO2 saturated photosynthetic capacity (42%) and photochemical dysfunctioning under limiting light conditions as manifest in a 38% decrease in quantum yield. Thylakoids isolated from these low K+ leaves showed no decrease in per chlorophyll concen- trations of photosystem I, cytochrome f/b complex and ATPase, but had 37% fewer atrazine-binding sites (corresponding to photosystem II reaction centres) than those from leaves with higher K+ concentrations. The decline in atrazine-binding sites in isolated thylakoids was sufficient to account for the loss of quantum yield in intact leaves. These results identify the atrazine-binding polypeptide of photosystem II as one site of sensitivity to salinity-induced K+ deficiency. 
