Cytochemical localization of ATPase and sub-cellular variation in mesophyll cell of Cyclocarya paliurus seedlings under iso-osmotic stress and calcium regulation

Abstract

The ultrastructural distribution and active location of ATPase and the ultrastructural variations were investigated in mesophyll cells of Cyclocarya paliurus seedlings after iso-osmotic salt/water treatments in combination with calcium regulation. C. paliurus seedlings were treated with five groups (control, 85 mM NaCl, 85 mM NaCl + 12 mM Ca(NO₃)₂, PEG iso-osmotic to 85 mM NaCl and PEG iso-osmotic to 85 mM NaCl +12 mM Ca(NO₃)₂) in a hydroponic system in a phytotron. Results show that under normal growth conditions, the ATPase activity was low and the enzyme was primarily located on the nucleus. After 12 days of iso-osmotic salt/water treatments, ATPase activity on the tonoplast increased. Osmiophilic globules for iso-osmotic water treatment were greater than that for iso-osmotic salt treatments. The ATPase activity increased and was mostly transferred onto the nucleus for calcium regulation treatment under iso-osmotic salt/water stresses, and the osmiophilic globules significantly decreased under iso-osmotic water stress with calcium regulation. The ATPase located on the nucleus indicated that the degree of salt/drought damage that seedlings suffered was slighter, while the amount of the enzyme located on the tonoplast showed that the degree of salt/drought damage there was more serious. After 4 and 20 days of isoosmotic treatments, the injury suffered by the leaf ultrastructures of C. paliurus seedlings for iso-osmotic treatment with calcium regulation was lower than those without calcium regulation, especially for the iso-osmotic water treatments. Preliminary analysis suggests that the injury suffered by C. paliurus seedlings was lower for iso-osmotic salt treatments than for iso-osmotic water treatments, while the effect of calcium regulation under iso-osmotic water stress was greater than that of the iso-osmotic salt stress.

Keywords

ATPase / calcium regulation / Cyclocarya paliurus / cytochemistry / iso-osmotic stress / mesophyll cell / ultrastructure

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