Abstract
Isolated mesophyll preparations of barley (Hordeum vulgare L.), wheat (Triticum aestivum L.), tobacco (Nicotiana tabacum L.), soybeans (Glycine max L. MERR.), and peanuts (Arachis hypogaea L.) partitioned photosynthetically assimilated carbon into starch and sugars at characteristic rates. The ratio of sugar to starch formation was highest with barley (5.4) and lowest with peanuts (0.8). Smaller differences in the potential for starch and sugar formation were also observed among wheat varieties. The results suggested that partitioning of photosynthetically fixed carbon between endproducts is biochemically and genetically controlled within the mesophyll cell.
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