KINETINLIKE FACTORS IN THE ROOT EXUDATE OF SUNFLOWERS

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Abstract
Two kinetinlike factors (I and II) were obtained from root exudate of sunflowers by means of paper chromatography. Their biological activity was estimated with a chlorophyll-preservation and cell-division test. Available evidence suggests that both factors are synthesized in the root and translocated via xylem to the shoot. Factor I apparently can be converted to factor II by hydrolysis. The significance of these root factors to shoot metabolism is discussed, especially with regard to the influence of the root environment on the supply of these hormones.

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