Abstract
Two kinds of effects of water stress on flag leaves of spring wheat (Triticum aestivum L. cv. Kolibri) were recognized: the direct effect, when drought affected the expanded blade of the flag leaf and the indirect one, when drought pretreatment affected the leaf blade during tissue differentiation. As a direct effect of water stress on the leaf, a decreased amount of (14)C incorporated into all analyzed photosynthates was observed. Differences in (14)C distribution among the studied photosynthates indicated that water stress decreased the carbon flow from intermediates to end products of the photosynthetic metabolism. Drought pretreatment protected (to some extent) the carbon photosynthetic metabolism against the inhibitory effect of the subsequent water stress. The modifications of photosynthetic carbon metabolism observed seem to be involved in adaptation of plants to the water stress conditions.
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