Abstract
Frost hardiness of spinach (Spinacia oleracea L.) leaves was increased by high concentrations of NaCl in the hydroponic culture medium. Freezing damage was determined by measurement of slow chlorophyll fluorescence quenching after freezing of leaves. Both the osmolality of the leaf sap and forst hardiness of the leaves were linearly correlated with the salt concentration in the hydroponic culture medium. Freezing damage occurred, irrespective of the extent of frost hardening, when dehydration of cells during extracellular ice formation decreased cellular volume to approximately 14% of the volume of unfrozen cells. The resistance of isolated, washed thylakoids against mechanical and chemical damage by freezing was investigated. Chemical damage by freezing caused by salt accumulation was measured as release of chloroplast coupling factor (CF1; EC 3.6.1.3), and mechanical damage was measured as release of the lumenal protein plastocyanin from the membranes during an in-vitro freeze-thaw cycle. Isolated thylakoids from salt-treated frost-hardy spinach and those from plants hardened under natural conditions did not exhibit improved tolerance against chemical freezing stress exerted by high salt concentrations. They were, however, more hardy than thylakoids from unhardened control leaves against mechanical damage by freezing.
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Abbreviations
- CF1:
-
peripheral part of chloroplast coupling factor ATPase
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Schmidt, J.E., Schmitt, J.M., Kaiser, W.M. et al. Salt treatment induces frost hardiness in leaves and isolated thylakoids from spinach. Planta 168, 50–55 (1986). https://doi.org/10.1007/BF00407008
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DOI: https://doi.org/10.1007/BF00407008