Library Open Repository
Auxin promotes gibberellin biosynthesis in decapitated tobacco plants
Wolbang_and_Ros...pdf | Request a copy
Full text restricted
Available under University of Tasmania Standard License.
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.
|Journal or Publication Title:||Planta|
|Page Range:||pp. 153-157|
|Identification Number - DOI:||10.1007/s004250100663|
Copyright 2001 Springer
|Date Deposited:||31 Jul 2012 07:44|
|Last Modified:||18 Nov 2014 04:39|
|Item Statistics:||View statistics for this item|
Actions (login required)
|Item Control Page|