In maize (Zea mays L., cv. Voronezhskaya-76) seedlings subjected to salinity, the values of indicators of stress response development (contents of proline and lactate, activity of peroxidase) were higher in the cells of mesophyll than in the bundle sheath. At short-term NaCl (150 mM) action, the main reactions of the total adaptation syndrome were located in the cell of mesophyll. At salinity, substantial rearrangements of the isoenzyme composition of the malate dehydrogenase (MDH) system main enzymes occurred, which determined cell energization, the synthesis of reducing equivalents, maintenance of the osmotic balance, and functioning of the Hatch-Slake cycle. The changes in some intermediate concentrations and MDH-system enzyme functioning occurring under stress conditions permit a suggestion that, in maize tissues subjected to salt stress, an additional metabolic pathway related to aspartate synthesis and transport is induced.
Russian Journal of Plant Physiology – Springer Journals
Published: May 3, 2011
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