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Rhythmic patterns of nutrient acquisition by wheat roots


Shabala, SN and Knowles, AE, Rhythmic patterns of nutrient acquisition by wheat roots, Functional Plant Biology, 29, (5) pp. 595-605. ISSN 1445-4408 (2002) [Refereed Article]

DOI: doi:10.1071/PP01130


Oscillatory patterns in H+, K+, Ca2+ and Cl- uptake were observed at different regions of the root surface, including root hairs, using a non-invasive ion flux measuring technique (the MIFE™ technique). To our knowledge, this is the first report of ultradian oscillations in nutrient acquisition in the mature root zone. Oscillations of the largest magnitude were usually measured in the elongation region, 2-4 mm from the root apex. There were usually at least two oscillatory components present for each ion measured: fast, with periods of several minutes; and slow, with periods of 50-80 min. Even within the same functional zone, the periods of ion flux oscillations were significantly different, suggesting that they are driven by some internal mechanisms located in each cell rather than originating from one 'central clock pacemaker'. There were also significant changes in the oscillatory characteristics (both periods and amplitudes) of fluxes from a single small cluster of cells over time. Analysis of phase shifts between oscillations in different ions suggested that rhythmic activity of a plasma membrane H+-pump may be central to observed rhythmic nutrient acquisition by plant roots. We discuss the possible adaptive significance of such an oscillatory strategy for root nutrient acquisition.

Item Details

Item Type:Refereed Article
Research Division:Biological Sciences
Research Group:Plant biology
Research Field:Plant physiology
Objective Division:Expanding Knowledge
Objective Group:Expanding knowledge
Objective Field:Expanding knowledge in the environmental sciences
UTAS Author:Shabala, SN (Professor Sergey Shabala)
UTAS Author:Knowles, AE (Mr Andrew Knowles)
ID Code:24606
Year Published:2002
Web of Science® Times Cited:22
Deposited By:Agricultural Science
Deposited On:2002-08-01
Last Modified:2011-10-06

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