Relationship between endogenous indole‐3‐acetic acid and abscisic acid changes and bark recovery in Eucommia ulmoides Oliv. after girdling

Eucommia ulmoides (Eucommiaceae), a traditional Chinese medicinal plant, is often subjected to severe manual peeling of its bark. If the girdled trunk is well protected from desiccation, new bark forms within 1 month. It has been proposed that phytohormones play a key role in this process. Research...

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Bibliographic Details
Published in:Journal of experimental botany 2003-08, Vol.54 (389), p.1899-1907
Main Authors: Mwange, Kalima N’Koma, Hou, Hong‐Wei, Cui, Ke‐Ming
Format: Article
Language:English
Subjects:
Abscisic Acid - metabolism
Antibodies
auxin (IAA)
Bark
bark recovery
Biological and medical sciences
cambial region
Cell Differentiation
Cell physiology
dedifferentiation
Eucommia ulmoides
Eucommiaceae - cytology
Eucommiaceae - physiology
Fundamental and applied biological sciences. Psychology
girdling
HPLC
immuno‐localization
Indoleacetic Acids - metabolism
Insulin antibodies
Key words: Abscisic acid (ABA)
Periderm
Plant Bark - cytology
Plant Bark - metabolism
Plant growth regulators
Plant physiology
Plant physiology and development
Plant tissues
Plants
Research Papers: Regulation of Growth, Development and Whole Organism Physiology
Vascular tissues
Xylem
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Summary:Eucommia ulmoides (Eucommiaceae), a traditional Chinese medicinal plant, is often subjected to severe manual peeling of its bark. If the girdled trunk is well protected from desiccation, new bark forms within 1 month. It has been proposed that phytohormones play a key role in this process. Research has been conducted to determine the distribution of endogenous indole‐3‐acetic acid (IAA) and abscisic acid (ABA) during the bark recovery, using high‐performance liquid‐chromatography (HPLC) and fluoro‐immuno‐localization techniques. Results showed that, from 2 d after girdling, the IAA content in the recovering bark (RB) increased markedly while that of ABA decreased. The opposite pattern was observed during progressive re‐establishment of the tissues. Immuno‐localization showed that most of the IAA was located in the RB tissue layers undergoing cell division, dedifferentiation and (re)differentiation, such as xylary rays, immature xylem, phellogen and cambial regions. This study also provides evidence that IAA and ABA are involved in the bark reconstitution.
ISSN:0022-0957
1460-2431
1460-2431
DOI:10.1093/jxb/erg204