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Auxin promotes gibberellin biosynthesis in decapitated tobacco plants

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Wolbang, CM and Ross, JJ (2001) Auxin promotes gibberellin biosynthesis in decapitated tobacco plants. Planta, 214 (1). pp. 153-157. ISSN 0032-0935

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Abstract

Excision of the apical bud (decapitation) of tobacco (Nicotiana tabacum L.) plants reduced the endogenous levels of indole-3-acetic acid (IAA), gibberellin A20 (GA20), and GA1 (the bioactive GA), in internode tissue below the excision site. Application of IAA to the stump of decapitated plants dramatically increased GA20 content, to a level 3-fold greater than in intact plants. Gibberellin A1 content was also increased by IAA. Decapitation reduced the conversion of [14C]GA19 to [14C]GA20 and of [14C]GA20 to [14C]GA1, and appeared to promote the deactivation pathway [14C]GA20 to [14C]GA29 to [14C]GA29-catabolite. Application of auxin counteracted these effects, but did not restore the conversion of [14C]GA20 to [14C]GA1 to the level found in intact plants. The results indicate that auxin is necessary for normal GA biosynthesis in stems of tobacco.

Item Type: Article
Journal or Publication Title: Planta
Page Range: pp. 153-157
ISSN: 0032-0935
Identification Number - DOI: 10.1007/s004250100663
Additional Information: Copyright 2001 Springer
Date Deposited: 31 Jul 2012 07:44
Last Modified: 18 Nov 2014 04:39
URI: http://eprints.utas.edu.au/id/eprint/14590
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