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Redistribution of radioactive assimilates in leaf tissues of cereals



Redistribution of radioactive assimilates in leaf tissues of cereals



Fiziol Rast 11(1): 38-42



In corn leaves the greatest rate of photosynthesis was noted in the chlorophyllous cells surrounding small vascular bundles, into which the assimilates passed 15- 20 minutes after the beginning of photosynthesis; after 120 minutes these assimilates were completely concentrated in the phloem of the large vascular bundles. In barley leaves, which do not have chlorophyllous cells around the vascular bundles, the assimilates were distributed more or less evenly in the mesophyll cells after 15 minutes of photosynthesis. After 120 minutes of redistribution a considerably portion of the products of photosynthesis was found the phloem of the vascular bundle. Accumulation of radioactive assimilates in the vascular bundles in the leaves of corn and barley occurs exclusively in the phloem.

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