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It has been previously shown that dormant, cold-hardy floral buds of  Azalea  possess layers of highly lignified and suberized cells below the bud axis and beneath each bud scale. Two species of deciduous  Azalea  were analyzed bi-weekly using differental thermal analysis (DTA) throughout their dormant season to determine the development of cold hardiness as denoted by low temperature exotherms (LTEs). Other buds collected at the same time were observed using fluorescence microscopy to document the relationship between the development of the barrier and the onset of cold hardiness. Preliminary analysis showed when buds were maximally cold hardy the barrier was most intact, and as buds began to lose hardiness, the layer started to degrade. These results suggest that in fact this layer of cells does act as the long-proposed bud barrier. In a comparison between the species, the hardier species ( R. japonicum ) was found to have a denser layer of phenolic-rich cells compared to buds of the less hardy species ( R. occidentale ). This finding further supports the relationship between the layer of cells and the existence of cold hardiness in bud tissues.

334 Seasonal Characterization of the Phenolic Layer Beneath Floral Buds of Rhododendron spp.