Effects of High Humidity on Translocation of Foliar-applied Labeled Compounds in Plants. II. Translocation from Starved Leaves

Abstract
Absorption and translocation of tracers by cotyledons of cotton seedlings are greatly increased by high humidity. This enhanced movement consists of increased phloem transport and induced uptake into and transport via the xylem. Studies with starved and normal seedlings prove that phloem transport is greatly reduced in leaves depleted of carbohydrate reserves; starvation has no effect upon xylem transport induced by high humidity.