We investigated dehydration avoidance, and damage to the plasma and thylakoid membranes, in the high-level abscisic acid drought-resistant line of Zea mays L., Polj 17, and the low-level abscisic acid drought-sensitive line, F-2, under water shortage, and water shortage and high-temperature stress conditions. The synthesis of heat-shock proteins in Polj 17 and F-2 under water shortage and high-temperature stress conditions was also examined. Under water shortage conditions both lines were mildly dehydrated and suffered damage to the plasma and thylakoid membranes to a similar extent. Exposure to water shortage and high-temperature stress revealed that the high-ABA line Polj 17 had greater capability of withstanding stress conditions than the low-ABA line F-2. Polj 17 showed greater ability to avoid dehydration than F-2. Lines Polj 17 and F-2 showed similar damage to the plasma and thylakoid membranes. However, Polj-17 showed much greater ability to tolerate damage to the cell membranes than F-2. Polj 17 and F-2 did not differ in the pattern of synthesis of heat-shock proteins. Both lines synthesized bands of heat-shock proteins of 43-45 kDa, which appear to be uncommon in maize. © 1992, Gustav Fischer Verlag, Stuttgart. All rights reserved.
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