Long-term acid-induced wall extension in an in-vitro system

R. E. Cleland, D. Cosgrove, M. Tepfer

Research output: Contribution to journalArticlepeer-review

42 Scopus citations


When frozen-thawed Avena sativa L. coleoptile and Cucumis sativa L. hypocotyl sections, under tension, are acid-treated, they undergo rapid elongation (acid-extension). The acid-extension response consists of two concurrent phases: a burst of extension which decays exponentially over 1-2 h (ExE), and a constant rate of extension (CE) which can persist for at least 6 h. The extension (AL) is closely represented by the equation: ΔL = a - a · ekt + c · t where a is the total extension of the exponential phase, k is the rate constant for ExE, and c is the rate of linear extension (CE). Low pH and high tension increased a and c, whereas temperature influenced k. The magnitude of the CE (over 50% extension/10 h), the similarity in its time course to auxin-induced growth, and the apparent yield threshold for CE indicate that CE is more likely than ExE to be the type of extension which cell walls undergo during normal auxin-induced growth.

Original languageEnglish (US)
Pages (from-to)379-385
Number of pages7
Issue number3
StatePublished - Mar 1987

All Science Journal Classification (ASJC) codes

  • Genetics
  • Plant Science


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