Salt Tolerance of Turfgrass puccinellia distans: II. Ionic Interaction in The Roots

Abstract

In this study, multi-compartment transport boxes were used to determine the mobility of ions in the execised roots. For measuring Na uptake, the concentrations of I, 50 and 150 mM NaCl were used in the external medium, whilst Ca were 0 and 2.0 mM. The uptake of K was measuredfiom I. 0 mM KC1 in the presence o f l a (0.50 and I 50 mM) and Ca (0, 0.5 and 2.0 mM). In the present study, 22 Na and 86 Rb were used to label Na and K in the external medium, respectively. Addition of Ca inhibited Na uptake in the roots exposed to I. 0 mM and 50 mM NaC1, thought Ca was relatively less eflective in 150 mM High concentrations of NaCl brought about the reduction of K uptake. Calcium, however, did not show any importance in recovering the uptake of Kfi.om the adverse effect of Na when the roots were exposed to 50 mM NaCl, thought stimulating eflect of Ca was observed at 150 mM NaCl. The results revealed that the pattern of ionic interactions in Puccinellia distans dzflers much with that generally found in most of halophyte plants.