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Nine sugar beet lines were grown in a glasshouse on chernozem soil watered to 35, 50 and 65 % of maximal soil water capacity. After 12 d, plant water potential, net photosynthetic rate, contents of soluble proteins, DNA and RNA, proportion of ribulose-1,5-bisphosphate carboxylase/oxygenase (RUBISCO) protein, and carbonic anhydrase activity were measured. As soil moisture decreased, the leaf water potential and net photosynthetic rate decreased. DNA and RNA content and carbonic anhydrase activity decreased under moderate drought, and increased with severe drought. RUBISCO protein proportion did not change significantly under decreased soil moisture, while the total soluble protein content decreased.
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Kevrešan et al. (1997) studied this question.
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