ISSN:
1432-2048
Keywords:
Acid-extension
;
Avena (extension growth)
;
Cell wall extensibility
;
Coleoptile (growth)
;
Cucumis (extension growth)
;
Hypocotyl (growth)
Source:
Springer Online Journal Archives 1860-2000
Topics:
Biology
Notes:
Abstract 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 · e kt + 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.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00395030
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