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

저자

강*구

게재저널

Environmental and Experimental Botany (http://www.sciencedirect.com/science/journal/00988472)

키워드

Auxin sensitivity, Ethylene, Ethrel, Petiole elongation, Ranunculus sceleratus

개요

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 logconcentration?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.

첨부파일

• 16. 강빈구-Enhancement of auxin sensitivity in Ranunculus sceleratus by ethylene; A mechanism to escape from hypoxia under temporary submergence.pdf [531,065 byte]

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