Abstract
Summary The relation of accumulation of free proline to different stress conditions was investigated in root tips of young plantules of Zea mays . The level of proline was found to increase as a consequence of drought treatments, and decrease to normal values when the seedlings were rewatered, and root growth reassumed. The accumulation of proline occurred in light or darkness, and even with restricted sugar supply. Other stress conditions, salinity, low temperature and abscisic acid treatment, also determined the accumulation of proline. The response of the two cultivars under study, differed when exposed to stress, and was not related to the degree of reduction in growth rate.
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