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

journal contribution
posted on 2023-05-16, 20:27 authored by Branka Zivanovic, Tracey Cuin, Sergey ShabalaSergey Shabala
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.

History

Publication title

Plant and Cell Physiology

Volume

48

Issue

4

Pagination

598-605

ISSN

0032-0781

Department/School

Tasmanian Institute of Agriculture (TIA)

Publisher

Oxford University Press

Place of publication

United Kingdom, Japan

Repository Status

  • Restricted

Socio-economic Objectives

Expanding knowledge in the environmental sciences

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