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
Full text not available from this repository.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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