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Poster Presentation

1. Role of leaves in maintenance of correlative inhibition in leafy spurge (Euphorbia esula) root buds.  David Horvath, USDA/ARS/BRL, Fargo, ND

Abstract. Earlier studies on the source of signals controlling correlative inhibition of root buds in leafy spurge indicated that either growing meristems (apical or growing axillary buds) by themselves or leaves by themselves could prevent root buds from breaking dormancy. In these experiments, the threshold level of leaves required to maintain correlative inhibition of the root buds was determined. It was observed that as few as 5 leaves remaining on budless stems would greatly reduce the growth of leafy spurge root buds. To determine if photosynthesis was necessary for the observed effect of leaves and buds, plants were placed in the dark for 1 week prior to removal of leaves, stem buds or both leaves and buds. The results from these experiments indicated that light was necessary for the leaf effects on root bud growth, but was not necessary for correlative inhibition by growing stem buds.

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