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Simultaneous Stem Diameter Expansions and Apoplastic Electropotential Variations Following Irrigation or Rainfall in Cotton¹

Temporary and permanent expansions of the stem diameter result from rainfall and irrigation of cotton under field conditions. This study is concerned with the simultaneous use of physical and invasive electrochemical sensors to monitor the timing of these expansions. The measurements were made over three seasons and have yielded a set of generalizations concerning the timing and magnitude of the expansions. The plant begins expansion during the night and/or next night following irrigation and/or rainfall. At the onset of the expansion there is a large magnitude precipitous drop in electropotential. Both the physical expansion and the electropotential drop are systemic, i.e., they occur simultaneously at widely separated parts of the plant. Several possible mechanisms giving rise to the physical and electropotential variations are discussed.

Key Words: Electrophytogram • Systematic variation • Irrigation response • Gossypium hirsutum L.

² Associate professor and graduate student Dep. of Electrical & Computer Engineering, Univ. of Arizona, Tucson, AZ 85721 and (FD-M) CONACYT (Mexico).

Received for publication April 7, 1982.