Uptake and metabolism of benzyladenine during shoot organogenesis in Petunia leaf explants |
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Authors: | Carol A Auer Michel Laloue Jerry D Cohen Todd J Cooke |
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Institution: | (1) Department of Botany, University of Maryland, 20742 College Park, MD, USA;(2) Laboratoire de Physiologie Cellulaire Végétale, CNRS, F-91198 Gif-sur-Yvette Cedex, France;(3) Plant Hormone Lab, USDA-ARS, 20705 Beltsville, MD, USA;(4) Present address: Laboratoire de Biologie Cellulaire, INRA, Route de Saint-Cyr, F-78026 Versailles Cedex, France |
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Abstract: | Benzyladenine (BAP) uptake and metabolism were characterized during the key stages of shoot organogenesis in leaf explants of Petunia MD1 . Using leaf explant transfer experiments, it was shown that exposure to 2.2 M BAP for 6, 8 or 10 days induced shoot formation on 27, 80 and 100% of the explants respectively, with a concomitant increase in the number of shoots per explant. BAP uptake and metabolism were characterized in leaf explants after 1, 3, 6 or 10 days exposure to 3H]BAP or 10 days exposure plus an additional 2 days on basal medium (10+2). BAP and 9- -D-ribofuranosyl-BAP (9R]BAP) were detected at days 1 and 3 only. Therefore, the BAP free base was not detectable during the shoot induction period between days 6 and 10, as defined by leaf transfer experiments. The BAP ribotide pool was largest on day 1 and decreased to day 10+2. It is possible that the BAP ribotide pool provided either the active cytokinin itself or acted as a short-term storage form for the active cytokinin in petunia shoot organogenesis. Other metabolites detected in petunia leaf tissue included 7- -D-glucopyranosyl-BAP (7G]BAP), 9- -D-glucopyranosyl-BAP (9G]BAP) and an unidentified metabolite C.Abbreviations BAP
benzyladenine
- 7G]BAP
7- -D-glucopyranosyl-BAP
- 9G]BAP
9- -D-glucopyranosyl-BAP
- 9R]BAP
9- -D-ribofuranosyl-BAP
- 9R-5 P]BAP
5 -monophosphate of 9R]BAP
- 9R-5 PP]BAP
5 -diphosphate of 9R]BAP
- 9R-5 PPP]BAP
5 -triphosphate of 9R]BAP
- TEA
Triethylamine
This research was supported in part by NSF Grant DCB-8917378 to J.D.C. and USDA-CRGO Grant 89-37261-4791 to T.J.C. |
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Keywords: | Cytokinin benzyladenine metabolism shoot organogenesis Petunia |
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