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The respiration of protoplasts from leaves of barley infected by powdery mildew (Erysiphe graminis f.sp. hordei).

McAinsh, Martin R. and Ayres, Peter G. and Hetherington, Alistair M. (1989) The respiration of protoplasts from leaves of barley infected by powdery mildew (Erysiphe graminis f.sp. hordei). Plant Science, 64 (2). pp. 221-230. ISSN 0168-9452

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Abstract

Infection of barley leaves by powdery mildew (Erysiphe graminis f.sp. hordei) causes increased dark respiration, par tof which is associated with active host responses to infection, and a consequence of which is reduced plant growth. The pathogen cannot be grown separately from the host. Therefore, in order to examine those changes in respiratory activity peculiar to the host, attempts were made to isolate protoplasts from infected tissues, and from healthy controls. Isolation of useful numbers (> 106cm−6) of viable mesophyll protoplasts from infected tissues was possible with one among several batches of commercial ‘Cellulysin’ tested; on analysis by sodium dodecyl sulphate-polyacrylamide gel electrophoresis (SDS-PAGE), this batch contained a low molecular weight protein at 20.1 kDa not found in other batches. In all isolated protoplasts, total respiration increased with the age of the source-leaf, but within 24 h of inoculation respiration was stimulated by infection. Protoplasts from infected leaves showed a small initial increase in the cyanide (CN)-sensitive component (cytochrome pathway) of total respiration, but an increase in the CN-insensitive component (alternative pathway) was the major cause of the stimulation of total respiration.

Item Type: Article
Journal or Publication Title: Plant Science
Uncontrolled Keywords: barley ; mesophyll protoplasts ; powdery mildew (Erysiphe graminis hordei) ; dark respiration ; alternative pathway
Subjects: Q Science > QH Natural history > QH301 Biology
Departments: Faculty of Science and Technology > Lancaster Environment Centre
Faculty of Science and Technology > Engineering
ID Code: 26860
Deposited By: Dr Martin R McAinsh
Deposited On: 31 Jul 2009 11:27
Refereed?: Yes
Published?: Published
Last Modified: 26 Jul 2012 16:36
Identification Number:
URI: http://eprints.lancs.ac.uk/id/eprint/26860

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