אסיף מאגר המחקר החקלאי

In vitro and in vivo modification of sugar transport and translocation in celery by phytohormones

Year:

1986

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Volume :

46

Co-Authors:

Daie, J., Biology Department, Utah State University, Logan, UT, United States
Watts, M., Biology Department, Utah State University, Logan, UT, United States
Aloni, B., USDA, ARS, Logan, UT 84322, United States
Wyse, R.E., USDA, ARS, Logan, UT 84322, United States

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Abstract:

In an attempt to address the controversy in the literature as to whether phytohormones have any direct effect on phloem loading of sucrose, we investigated the effect of gibberellic acid (GA3) and indoleacetic acid (IAA) on sugar transport and translocation in celery (Apium graveolens L. cv. Utah 5270). Both hormones enhanced sucrose uptake into isolated vascular bundles and phloem tissue of celery and enhanced the export of 14C assimilates from leaves of intact plants in vivo. The hormone-induced increase of uptake into isolated vascular bundles or phloem was specific for sucrose and mannitol which are translocated in phloem. Furthermore, the hormone-induced increase in translocation was not due to an increase in sink demand, since neither glucose nor sucrose uptake rates were affected in the storage parenchyma tissue discs (sink region) in the presence of GA3 or IAA. The evidence suggests that phytohormones may have a direct effect on phloem loading of sucrose. The possibility of short-term GA3 and IAA effects on processes resulting in membrane transport of sugars in celery is discussed. © 1986.

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