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

Citation

Zivanovic, B and Cuin, TA and Shabala, SN, 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 (2007) [Refereed Article]

DOI: doi:10.1093/pcp/pcm032

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 K+, Ca 2+ and H+ 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 light-induced K+ flux kinetics are different between growing and non-growing tissues and attribute this difference to the direct involvement of RL-induced K+ flux in turgor-driven leaf expansion growth controlled by the epidermis, as well as to the charge-balancing role of K+ in the leaf mesophyll. Generally, BL was much more efficient in stimulating K+ uptake in the growing basal region compared with RL. We also show a much stronger influence of RL on Ca 2+ fluxes in the basal region compared with BL, which argues in favor of the importance of RL in Ca2+ signaling during leaf growth. © The Author 2007. Published by Oxford University Press on behalf of Japanese Society of Plant Physiologists. All rights reserved.

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
Author:Zivanovic, B (Dr Branka Zivanovic)
Author:Cuin, TA (Dr Tracey Cuin)
Author:Shabala, SN (Professor Sergey Shabala)
ID Code:48797
Year Published:2007
Web of Science® Times Cited:5
Deposited By:Agricultural Science
Deposited On:2007-08-01
Last Modified:2009-08-06
Downloads:0

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