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Spectral and dose dependence of light-induced ion flux responses from maize leaves and their involvement in leaf expansion growth

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Zivanovic, B and Cuin, TA and Shabala, SN (2007) Spectral and dose dependence of light-induced ion flux responses from maize leaves and their involvement in leaf expansion growth. Plant and Cell Physiology, 48 (4). pp. 598-605. ISSN 0032-0781

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Abstract

Two types of segments (intact leaf tissue and isolated
mesophyll tissue respectively) were isolated from basal (still
growing) and tip (non-growing) maize leaf regions. The leaf
segments were exposed to different light qualities (blue or red
light) and quantities, and net fluxes of Kþ, Ca2þ and Hþ were
measured non-invasively using ion-selective vibrating microelectrodes
(the MIFE technique). A clear dose dependency of
all ion flux responses on both red (RL) and blue (BL) light
fluence rate was found. We provide evidence that lightinduced
Kþ flux kinetics are different between growing and
non-growing tissues and attribute this difference to the direct
involvement of RL-induced Kþ flux in turgor-driven leaf
expansion growth controlled by the epidermis, as well as to
the charge-balancing role of Kþ in the leaf mesophyll.
Generally, BL was much more efficient in stimulating Kþ
uptake in the growing basal region compared with RL. We
also show a much stronger influence of RL on Ca2þ fluxes in
the basal region compared with BL, which argues in favor of
the importance of RL in Ca2þ signaling during leaf growth.

Item Type: Article
Keywords: Expansion growth — Ion fluxes — Ion-selective microelectrodes — Light — Photosynthesis — Zea mays L.
Journal or Publication Title: Plant and Cell Physiology
Publisher: Oxford University Press
Page Range: pp. 598-605
ISSN: 0032-0781
Identification Number - DOI: 10.1093/pcp/pcm032
Date Deposited: 07 Apr 2008 14:10
Last Modified: 18 Nov 2014 03:33
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