Journal of Food, Agriculture and Environment

Dynamic changes of endogenous hormones in terminal buds growing in different positions on artificially extended trunks of Paulownia spp.

Author(s):

Yanmei Wang ¹, Tianxiao Ma ², Zhen Liu ¹*, Xiaofeng Niu ³, Daihui Chen ¹

Recieved Date: 2014-02-03, Accepted Date: 2014-04-04

Abstract:

This study used 2-year-old seedlings of Paulownia tomentosa × P. fortunei 33 to study the effects of trunk extension on changes of endogenous hormones. Enzyme-linked immunosorbent assay (ELISA) was used to measure changes of endogenous hormones in terminal buds of extended trunk branches (top branches), upper branches, central branches and lower branches. The results were as follows: 1) The IAA content of branches in different positions of the tree shared this characteristic “up-down-up”.The IAA content of the extended trunk branch reached its maximum. It was clearly higher than in other positions. 2) The GA₃ content of branches in different positions showed a different trend along with the time change. The biggest change was in the central branches. From 5-15 to 8 to 15, the GA₃ content was significantly higher than in other parts. 3) The change of ABA content in different positions was basically in the same trend. The ABA (abscisic acid) content increased starting on May 15, peaking on June 15, and declining from June 15 to August 15 after which it was basically stabilized at a low level. 4) In May ZR (zeatin riboside) content in the central and lower branches of plants with an extended trunk was lower than in naturally occurring plants, but was higher than in naturally occurring plants from June to August. Promoter action of ZR was centralized in the leaves of the central branches and the lower branches of a tree with an extended trunk. By September, when the trees enter the late stage of growth, this type of promotion effect obviously slowed. 5) The ratio of (IAA + GA₃ + ZR)/ABA at all different positions in an extended trunk was slightly larger than during the natural state from May to June; this was especially true in extended trunk and upper branches. This condition shifted to the central and  lower branches in July. The ratio at all different positions in a plant with an extended trunk was larger than in the natural state in August; this trend extended into September in the central and lower branches.

Keywords:

Endogenous hormones, ELISA, trunk extension, Paulownia

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Journal: Journal of Food, Agriculture and Environment
Year: 2014
Volume: 12
Issue: 2
Category: Environment
Pages: 1244-1247

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