Waterlogging and salinity effects on two Suaeda salsa populations

Abstract

Adaptations to combined salinity and waterlogging stress were evaluated in two Suaeda salsa populations from different saline environments. Seedlings were exposed to 1, 200 and 600 mM NaCl in drained or waterlogged sand for 22 days in a glasshouse. Waterlogging did not significantly affect the K(+) /Na(+) ratio or Cl(-) concentration in leaves of either population. Adventitious roots were produced only by the inland population and under the waterlogged condition. X-ray microanalysis showed that S. salsa roots of the intertidal population accumulated more [Na(+) ] and [Cl(-) ] in both the cortex and stele than the roots of the inland population. The ability of roots to exclude Na(+) and Cl(-) was greater in the intertidal population than in the inland population, which may explain why leaves of the intertidal population accumulated less Na(+) and Cl(-) than the leaves of the inland population. The lower level of Cl(-) than Na(+) in leaves of both populations may result from the greater ability of roots to exclude Cl(-) than Na(+) . These traits may help the two S. salsa populations adapt to their different saline environments.

Is the reduced growth of the halophyte Suaeda maritima under hypoxia due to toxicity of iron or manganese?

“…However, growth of an inland population of the same species was reduced by saline (200 mM NaCl) waterlogging (Song et al 2011), consistent with the conclusions drawn by Barrett-Lennard and Shabala (2013) that of 13 halophytes for which they tabulated data, nine showed reduced growth in response to waterlogging under saline conditions (four benefitted from combined stresses). We do not know if the greater effect of flooding in the solid than the liquid medium in our experiments was due to a difference in oxygen concentrations as we were unable to measure this parameter in the solid medium.…”

“…salsa), where growth was hardly reduced by waterlogging in the presence 200 mM NaCl (Song et al 2011). However, growth of an inland population of the same species was reduced by saline (200 mM NaCl) waterlogging (Song et al 2011), consistent with the conclusions drawn by Barrett-Lennard and Shabala (2013) that of 13 halophytes for which they tabulated data, nine showed reduced growth in response to waterlogging under saline conditions (four benefitted from combined stresses).…”

Salt priming improved salt tolerance in sweet sorghum by enhancing osmotic resistance and reducing root Na+ uptake

“…was extracted according to Song et al (2011). Dried plant powder (0.1 g) was homogenized with deionized H 2 O (25 ml) and boiled for 2 h. The supernatant was collected after centrifugation for measuring Na ?…”

Salt pretreatment alleviated salt-induced photoinhibition in sweet sorghum

“…The extraction of Na ? was performed according to Song et al (2011). Deionized H 2 O was added to 0.1 g dried plant powder and boiled for 2 h. The supernatant was diluted with deionized H 2 O for measuring Na ?…”