Hourly Variations in Carbohydrate Content of Leaves and Petioles

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Abstract
Soybeans, sunflowers, and potatoes grown 2 yrs. with hourly deter initiations of simple sugars, sucrose, starch, and hemi-celluloses in the leaves and petioles showed relative amounts of carbohydrate forms consistent with growing conditions rather than sp. Sucrose did not appear at all in potato stems or soybean roots under certain conditions nor become abundant elsewhere until simple sugars reached certain maxima. The data are interpreted to indicate that simple sugars are the primary products of photosynthesis and the usual translocation forms, sucrose and hemicellulose, are temporary storage and reserve carbohydrates. Drouth resistance in sp. appeared to be correlated with the capacity of maintaining high hemicellulose reserves. The large quantity of carbohydrates disappearing from the leaves in 1-2 hrs. does not agree with current concepts of translocation. Sampling at intervals of 10 min. and less was necessary for studies of progressive carbohydrate changes.

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