Plant and Soil

, Volume 77, Issue 2–3, pp 183–192 | Cite as

Water relations, ethylene production, and morphological adaptation ofFraxinus pennsylvanica seedlings to flooding

  • Z. C. Tang
  • T. T. Kozlowski


Fraxinus pennsylvanica Marsh. seedlings that were 150 days old adapted well to flooding of soil with stagnant water for 28 days. Early stomatal closure, followed by reopening as well as hypertrophy of lenticels and formation of adventitious roots on submerged portions of stems appeared to be important adaptations for flood tolerance. Leaf water potential (ψ1) was consistently higher in flooded than in unflooded seedlings, indicating higher leaf turgidity in the former. This was the result of (1) early reduction in transpiration associated with stomatal closure, and (2) subsequently increased absorption of water by the newly-formed adventitious roots as stomata reopened and transpiration increased. Waterlogging of soil was followed by large increases in ethylene content of stems, both below and above the level of submersion. Formation of hypertrophied lenticels and adventitious roots on flooded plants was correlated with increased ethylene production. However, the involvement of various compounds other than ethylene in inducing morphological changes in flooded plants is also emphasized.

Key words

Adaptation Adventitious roots Ethylene Flooding Fraxinus pennsylvanica Lenticels Turgidity Water potential Water relations 


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Copyright information

© Martinus Nijhoff/Dr W. Junk Publishers 1984

Authors and Affiliations

  • Z. C. Tang
    • 1
  • T. T. Kozlowski
    • 1
  1. 1.Department of ForestryUniversity of WisconsinMadisonUSA

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