. Sodium accumulation in Pappophorum I. Uptake, transport and recirculation.

TALEISNIK E

ANNALS OF BOTANY

OXFORD UNIV PRESS

Lugar: Oxford; Año: 1989 p. 221 - 228

0305-7364

The uptake, transport and accumulation of sodium were compared in two grasses: Pappophorum pappifervm (Lam.) O. Kuntze, a glycophyte and P. philippianum L. R. Parodi, a facultative halophyte. At low salinity levels, (50 mM NaCl) shoots of salt-treated P. pappiferum accumulated lower Na+ concentrations than the other species. This difference does not seem to be related to Na+ uptake, as in short-time experiments (< I h), whole plants of both species showed similar rates of Na+ uptake and transport Sodium recirculation was assessed in split-root experiments. It was similar in control (previously non-salinized) plants of both species, but in salt-treated plants it was more significant in P. pappiferum. This mechanism, along with increased loss of recently acquired Na+, could contribute to keep Na+ levels lower in shoots of P. pappiferum than in P. philippianum.