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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]
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 |
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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: | Zivanovic, B (Dr Branka Zivanovic) |
UTAS Author: | Cuin, TA (Dr Tracey Cuin) |
UTAS Author: | Shabala, SN (Professor Sergey Shabala) |
ID Code: | 48797 |
Year Published: | 2007 |
Web of Science® Times Cited: | 8 |
Deposited By: | Agricultural Science |
Deposited On: | 2007-08-01 |
Last Modified: | 2009-08-06 |
Downloads: | 0 |
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