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The effects of water stress on plants have been reviewed in several articles (3, 5-7, 14, 15). These reviews indicated that all plant growth processes are adversely affected at some stage of water stress. Studies of the effects of water stress on subcellular processes are few (1, 4, 13) and cause and effect relationships at this level are little understood. Several recent reports indicate an increase in cytochrome oxidase activity and ultrastructural changes in mitochondria in water-stressed roots under both in vitro and in vivo conditions (12, 13). In studying the reactions of mitochondria isolated from the shoots of water deficient etiolated corn plants, we have noted that the ion and water transport properties of the mitochondria were altered when such properties were compared to mitochondria isolated from the etiolated shoots of nonstressed plants.

The Effects of Water Stress on Some Membrane Characteristics of Corn Mitochondria