A role for the stele in inter tissue signalling in the initiation of abscission in bean leaves (Phaseolus vulgaris L.)

Thompson, D.S. and Osborne, D.J. 1994. A role for the stele in inter tissue signalling in the initiation of abscission in bean leaves (Phaseolus vulgaris L.). Plant Physiology. 105 (1), pp. 341-347. doi:​10.​1104/​pp.​105.​1.​341

TitleA role for the stele in inter tissue signalling in the initiation of abscission in bean leaves (Phaseolus vulgaris L.)
AuthorsThompson, D.S. and Osborne, D.J.
Abstract

A combination of microdissection and viscometric endo-[beta]-1,4-glucanhydrolase assays was used to investigate if the early appearance of the abscission-related isoelectric point-9.5 endo-[beta]-1,4-glucanhydrolase in the stele of the pulvinus and abscission zone of the foliar abscission zone of Phaseolus vulgaris L. prior to cell separation (reported by E. del Campillo, P.D. Reid, R. Sexton, L.N.Lewis [1990] Plant Cell 2: 245-254) indicates that the vascular tissue of this region has a specific role in abscission. We find that no endo-[beta]-1,4-glucanhydrolase activity or cell separation is detectable in the abscission zone cortex if the abscission zone cortex is separated from the stele tissue. If the stele is separated from the abscission zone cortex after a lag period but again before any endo-[beta]-1,4-glucanhydrolase activity is present in the abscission zone cortex, then the enzyme is produced in the cortex and abscission ensues. We conclude that the cortex of the abscission zone is able to abscind independently of the vascular tissue only after the vascular tissue has begun to respond to abscission-promoting signals. We suggest that ethylene promotes formation of an abscission-permitting signal in the stele of the abscission zone and pulvinus, and that this signal is an essential elicitor for the synthesis of cell separation enzymes in the target cells of the abscission zone cortex.

JournalPlant Physiology
Journal citation105 (1), pp. 341-347
ISSN0032-0889
YearMay 1994
PublisherAmerican Society of Plant Biologists
Digital Object Identifier (DOI)doi:​10.​1104/​pp.​105.​1.​341
Web address (URL)http:/​/​dx.​doi.​org/​10.​1104/​pp.​105.​1.​341
Publication dates
PublishedMay 1994

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