Antioxidant and anatomical responses in shoot culture of the apple rootstock MM 106 treated with NaCl, KCl, mannitol or sorbitol
2006
Molassiotis, A.N.(Aristotle Univ. of Thessaloniki (Greece). School of Agriculture) E-mail:[email protected] | Sotiropoulos, T.(Pomology Inst., Naoussa (Greece)) | Tanou, G.(Aristotle Univ. of Thessaloniki (Greece). School of Agriculture) | Kofidis, G.(Aristotle Univ. of Thessaloniki (Greece). Dept. of Botany) | Diamantidis, G.(Aristotle Univ. of Thessaloniki (Greece). School of Agriculture) | Therios, I.(Aristotle Univ. of Thessaloniki (Greece). School of Agriculture)
To determine whether the major influence of high salinity is caused by the osmotic component or by salinity-induced specific ion toxicity, we compared the effects of mannitol, sorbitol, NaCl and KCl (osmotic potential -1.0 MPa) on the antioxidant and anatomical responses of the apple rootstock MM 106 explants grown in the MS medium. All the compounds had a significant influence on explant's mineral composition. Mannitol and salts decreased chlorophyll content and increased proline content. Superoxide dismutase, peroxidase and non-enzymatic antioxidant activities as well as H2O2 content were increased in the leaves and stems. Catalase activity was depressed. The thickest lamina was observed in NaCl-treated leaves. An increase of the relative volume of the intercellular spaces in response to NaCl was observed. Na accumulation is the first candidate for the distinct antioxidant and anatomical responses between saline and osmotically generated stress.
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