Physiological Aspects of Parasitism in Mistletoes (Arceuthobium and Phoradendron). I. The Carbohydrate Nutrition of Mistletoe

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Abstract
The carbohydrate nutrition of Arceuthobium and Phoradendron was studied by exposing the terminal foliage of infected branches to C14O2 and following the subsequent translocation and accumulation of labeled photosynthate by means of radioautography (X-ray film, with the mounted plant parts covered with Saran wrap) and radioassay. It was found that chemical autographs on the X-ray film could be prevented by the use of the Saran wrap. Arceuthobium accumulated large amounts of photosynthate from its host and concentrated this in its endophytic system and aerial shoots. Phoradendron failed to show any appreciable uptake of C compounds from its host. Arceuthobium campylopodum. infecting Abies concolor, draws upon the carbohydrate supply (principally sucrose) of its host throughout the year. Arceuthobium infections were capable of reversing the assimilate stream in the host stems at all times of the year when such stems were defoliated.

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