Enhancement of auxin sensitivity in Ranunculus sceleratus by ethylene: A mechanism to escape from hypoxia under temporary submergence

► Submerged Ranunculus sceleratus grows faster with entrapped ethylene to escape. ► The ethylene-promoted growth is auxin-dependent. ► Kinetic analysis reveals the left shift of auxin dose–response curve by ethylene. ► Increase of auxin sensitivity is the key mechanism of the escaping growth. We ana...

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Bibliographic Details
Published in:Environmental and experimental botany 2011-09, Vol.72 (2), p.266-271
Main Authors: Park, Woong June, Hertel, Rainer, Kang, Bin Goo
Format: Article
Language:English
Subjects:
Auxin sensitivity
Biological and medical sciences
Ethrel
Ethylene
Fundamental and applied biological sciences. Psychology
Petiole elongation
Ranunculus sceleratus
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Summary:► Submerged Ranunculus sceleratus grows faster with entrapped ethylene to escape. ► The ethylene-promoted growth is auxin-dependent. ► Kinetic analysis reveals the left shift of auxin dose–response curve by ethylene. ► Increase of auxin sensitivity is the key mechanism of the escaping growth. We analyzed auxin-induced and ethylene-enhanced elongation of petiole segments in Ranunculus sceleratus L. The early time course of elongation in petiolar segments was monitored with a computer-based video digitizer system. The application of ethylene-releasing ethrel slightly increased the elongation rate in the absence of IAA. When IAA alone was applied, elongation increased after a latent period of approximately 30 min. Maximal elongation rate was attained immediately after the latent period, and then the stabilized steady rate was recorded. During this phase, addition of ethrel strongly increased the elongation rate after a period of approximately 18 min. Although ethrel could acidify the growth medium, only a small part of the enhanced elongation was due to an acid-growth effect. Most of the growth stimulation was auxin-dependent and must be ascribed to the presence of ethylene. In the presence of ethrel, the log-concentration–response curve of IAA appeared to be shifted to the left. This kinetic analysis indicates an increase, due to ethylene, in the sensitivity of the R. sceleratus petiole to auxin, which results in inducing rapid growth to escape from hypoxia under temporary submergence.
ISSN:0098-8472
1873-7307
DOI:10.1016/j.envexpbot.2011.03.014