Title: Comparative studies of sucrose and mannitol utilization in celery (<i>Apium graveolens</i>)
Abstract: Utilization of sucrose and mannitol, the major forms of translocatable assimilate in celery ( Apium graveolens L. cv. Giant Pascal), was investigated in intact plants, excised leaves and leaf discs by estimating the soluble carbohydrate pools, starch levels and oxidation of [ 14 C]‐sucrose or mannitol in the light and after extended dark treatments. In detached mature fully‐expanded leaves, mannitol pools remained constant, while sucrose decreased during a 48 h dark treatment. In attached leaves on plants trimmed to a single compound leaf, however, mannitol levels decreased after a dark treatment. In leaf discs floated on bathing solutions containing [ 14 C]‐sucrose or [ 14 C]‐mannitol, oxidation of mannitol was restricted to young leaf tissues, whereas sucrose was metabolized to CO 2 regardless of leaf age. Uptake of labelled mannitol, however, was greater than that of sucrose in the light in leaves of every age. Although both mannitol and sucrose are translocated out of leaf tissues, leaf age differences indicate that, unlike sucrose, mannitol utilization is restricted to active sink tissues. The results suggest different roles for mannitol and sucrose with mannitol representing a more rigorously sequestered transport carbohydrate.
Publication Year: 1987
Publication Date: 1987-02-01
Language: en
Type: article
Indexed In: ['crossref']
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Cited By Count: 35
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