Abstract
Summary Nectar secretion in Billbergia nutans is inhibited by cooling, KCN, dinitrophenol, cytochalasin B, colchicine, deoxyglucose, and different dyes. In active nectaries the dictyosomes of the glandular epithelium are hypersecretory, in inhibited ones there are no or only a few small secretory Golgi vesicles. 90 min after feeding with galactose, melibiose, maltose, raffinose, ribose and deoxyglucose, these sugars appear in the nectar. However, feeding with glucose, fructose or saccharose does not change the relation of these sugars in the secreted fluid. Some of the dyes move up in the secretory cells, obviously through the cell walls, but are not secreted. Amino acids are also retained. Provided that all nectar passes the Golgi apparatus, the life-time of a Golgi vesicle is 2,3 min. If all prenectar passes the plasmodesmata between the subepithelial and the epithelial cells, there is a sugar flux of about 2,4 · 10− 18 M saccharose × sec− 1 per plasmodesmos. It seems, however, probable that nectar components also move through the apoplast.
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