Rapid osmotic adjustment by a succulent halophyte to saline shock.

Abstract:

:The objective of this research was to measure the short term osmotic adjustment of Salicornia europaea L. ssp. rubra (A. Nels) Breitung when suddenly exposed to 100 millimolar NaCl. Plants were grown hydroponically, shocked with 100 millimolar NaCl added to the culture solution, and stem tips analyzed for free inorganic ions and small organic molecules at intervals up to 72 hours. In the first 2 hours, the calculated leaf osmoticum showed a net increase of 158.8 millimolar most of which was free Mg(2+) (+135.3 millimolar). Total sugars increased almost 5-fold by the 6th hour, enough to provide sufficient osmoticum for the cytoplasm if only partially confined there. By 24 hours, all measured osmotica had decreased except Na(+), Mg(2+), Cl(-), and proline, with the net increase being 208 millimolar. By 72 hours, there was a net gain of 356 millimolar in osmotica of the stem tips, due to Na(+) (+233.3 millimolar), Cl(-) (+306.7 millimolar), and a small increase in sugar and proline (+3.5 millimolar), with all other osmotica decreasing in concentration. Compatible osmotica did not change sufficiently to account for osmotic balance between vacuole and cytoplasm; consequently, there must have been a reapportionment of osmotica within the cell in the short time duration of this experiment.

journal_name

Plant Physiol

journal_title

Plant physiology

authors

McNulty IB

doi

10.1104/pp.78.1.100

subject

Has Abstract

pub_date

1985-05-01 00:00:00

pages

100-3

issue

1

eissn

0032-0889

issn

1532-2548

journal_volume

78

pub_type

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