The temporal correlation of changes in apoplast pH and growth rate in maize coleoptile segments

Auxin induces extracellular acidification in growing shoot tissue. The causal relationship between this process and auxin-mediated growth is debated, partly because of contradicting previous reports on the temporal correlation of auxin-induced apoplast pH-drops and growth bursts. We have simultaneou...

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Veröffentlicht in:Australian journal of plant physiology 1998, Vol.25 (1), p.21-25
Hauptverfasser: Peters, W.S, Luthen, H, Bottger, M, Felle, H
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Sprache:eng
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Zusammenfassung:Auxin induces extracellular acidification in growing shoot tissue. The causal relationship between this process and auxin-mediated growth is debated, partly because of contradicting previous reports on the temporal correlation of auxin-induced apoplast pH-drops and growth bursts. We have simultaneously measured both parameters on the background of spontaneously occurring endogenous changes in growth rate and apoplast pH in maize coleoptile segments. Our data demonstrate good temporal correlation, during both the ‘Spontaneous Growth Response’ and the response to exogenous auxin, which is transient under the conditions chosen due to rapid auxin metabolism. We suggest that cell wall pH and growth rate are co-regulated in this organ, and that contradictions in the literature might be due to technical difficulties. Keywords: Zea mays L., acid-growth theory, auxin, indole-3-acetic acid, cell wall pH, coleoptile. Australian Journal of Plant Physiology 25(1) 21 - 25 Full text doi:10.1071/PP97101 © CSIRO 1998
ISSN:0310-7841
1445-4408
1445-4416
1446-5655
DOI:10.1071/PP97101