Author:
Shabala Sergey,Knowles Andrew
Abstract
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.
Subject
Plant Science,Agronomy and Crop Science
Cited by
29 articles.
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