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Changes in stomatal behaviour in the calcicole Leontodon hispidus due to the disruption by ozone of the regulation of apoplastic Ca2+ by trichomes.

de Silva, D. L. R. and Mansfield, T. A. and McAinsh, Martin (2001) Changes in stomatal behaviour in the calcicole Leontodon hispidus due to the disruption by ozone of the regulation of apoplastic Ca2+ by trichomes. Planta, 214 (1). pp. 158-162. ISSN 0032-0935

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Abstract

Regulation of the concentration of Ca2+ in the apoplast of plants is essential in order to allow Ca2+-dependent processes, such as Ca2+-mediated signal transduction in stomatal guard cells, to function correctly. This is particularly important for plants growing with high levels of Ca2+ in the rhizosphere. Recently, we have shown that in two calcicoles, Leontodon hispidus L. and Centaurea scabiosa L., trichomes play a key role in this regulatory process. Ozone is known to have a marked effect on plant Ca2+ homeostasis. Therefore, we have examined the effect of this pollutant on the regulation by trichomes of apoplastic Ca2+ in the calcicole L. hispidus. Treatment with 100 nl l-1 ozone resulted in a reduction in stomatal conductance of approximately 25% in plants grown with 15 mM Ca2+ in the rhizosphere. Analysis of total Ca2+ levels revealed that these changes in stomatal behaviour reflect a decrease in the ability of trichomes to sequester Ca2+. The amount of Ca2+ present in the trichome tip cell was reduced by approximately 38%. This was accompanied by an increase in the levels of Ca2+ in the guard cells and other tissues of the leaf. These data suggest that ozone has a detrimental effect on the ability of trichomes to regulate the concentration of apoplastic Ca2+ in L. hispidus, resulting in altered stomatal behaviour, and hence gaseous exchange, possibly due to the disruption of guard-cell Ca2+-mediated signal transduction. This has important implications for the growth and survival of plants growing in Ca2+-rich soils.

Item Type: Article
Journal or Publication Title: Planta
Uncontrolled Keywords: Apoplastic Ca 2+ ; Calcicole ; Leontodon (calcicole) ; Ozone ; Stomate ; Trichome
Subjects: Q Science > QH Natural history > QH301 Biology
Departments: Faculty of Health and Medicine > Medicine
Faculty of Science and Technology > Lancaster Environment Centre
ID Code: 8988
Deposited By: Dr Martin R McAinsh
Deposited On: 20 May 2008 13:35
Refereed?: Yes
Published?: Published
Last Modified: 26 Jul 2012 18:29
Identification Number:
URI: http://eprints.lancs.ac.uk/id/eprint/8988

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