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JXB Advance Access originally published online on April 8, 2004
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Journal of Experimental Botany, Vol. 55, No. 400, pp. 1187-1193, May 1, 2004
© 2004 Oxford University Press

Limitations to Photosynthetic Performance

Seeing ‘cool’ and ‘hot’—infrared thermography as a tool for non-invasive, high-throughput screening of Arabidopsis guard cell signalling mutants

Received 15 September 2003; Accepted 24 February 2004

Yibing Wang1,*, Geoffrey Holroyd1, Alistair M. Hetherington1 and Carl K-Y. Ng2,{dagger}

1 Department of Biological Sciences, Institute of Environmental and Natural Sciences, Lancaster University, Bailrigg, Lancaster LA1 4YQ, UK
2 Department of Botany, University College Dublin, Belfield, Dublin 4, Ireland

* Present address: Department of Plant Sciences, University of Oxford, South Parks Road, Oxford OX1 3RB, UK.
{dagger} To whom correspondence should be addressed. Fax: +353 1 716 1153. E-mail: carl.ng{at}ucd.ie

The use of Arabidopsis mutants defective in abscisic acid (ABA) perception has been instrumental in the understanding of stomatal function, in particular, ABA signalling in guard cells. The considerable attention devoted to ABA signalling in guard cells is due in part to (1) the fundamental role of ABA in drought stress and (2) the use of a screening protocol based on the sensitivity of seed germination to ABA. Such a screen has facilitated the isolation of ABA signalling mutants with genetic lesions that exert pleiotropic effects at the whole plant level. As such, there is a requirement for new approaches to complement the seed germination screen. The recent advances made in the use of infrared thermography as a non-invasive, high-throughput tool are reviewed here and the versatility of this technique for screening Arabidopsis defective in stomatal regulation is highlighted.

Key words: Arabidopsis, drought, EMS mutants, infrared thermography, low humidity.


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