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Abstract.Tissue and cell water relations parameters were followed forHeteromeles arbutifolia, Cercis occidentalisandAesculus californica, in an environment exhibiting seasonally increasing drought. The extensive seasonal osmotic adjustment of evergreenH. arbutifoliaand the moderate adjustment inC. occidentalisclosely matched their respective seasonal decreases in minimum daily water potential. Summer deciduousA. californicaexhibited only small drops in osmotic potential and water potential. Experiments with irrigated plants indicated that drought was not required for the osmotic adjustment ofH. arbutifoliaandC. occidentalis.However, inH. arbutifoliadrought treatment enhanced osmotic adjustment. In irrigatedH. arbutifolia, osmotic adjustment was mainly the result of an accumulation of osmotica. In drought‐stressed plants, the same change in osmotic potential resulted from a combination of accumulation of osmotica and a decrease in symplast volume.
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Calkin et al. (1984) studied this question.
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