Bleeding sap of sunflower seedlings (Helianthus annuus] whieh had been transferred to •' •' "Fe-or ^"Mii-labelled nutriciil sohilion 16 hours before deeapitation, was fractionated by gelfiltration on Sephade.x G-15.In both the ^'Fe-and the •'•'Mn-labelled bleeding sa]) Ihree fraetions eould be determined, eontainiiig Ihe liiicroelenient together wilh amino aeids and earbohydrates.According to the results of getfittration, the nioleeular weight of these compounds ranges betow 1500.
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