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anatomical study apical bud axils of leaves basal buds bud growth buda bude Buds on severed buds to develop carbohydrates cells complete defoliation Cornell University cotyledonary buds cotyledons daeapitatad dark 72 hrs days after ringing days after treatment dead zone decapitated ia decapitated in tha decapitated plants epicotyl expanding leaves factor following decapitation Gardner growing apex growing top growth of buds hypocotyl inhibit bud development inhibiting substance inhibitory substance initiated injected laavaa leavea leaves removed longitudinal Louisiana State University low nitrogen McCallum nitrates nitrogen normal nutritive exhaustion phloem pith cavity plants decapitated plants wara plants were ringed prevent protoxylem parenchyma Red Kidney ringed plants ringed portion ringed zone rubber tubing safranin scalded second compound leaf side not severed sieve tube elements Snow 34 sodium nitrate stem sucrose supply tha bud tha growing tha simple leaves tissue translocation xylem