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The effects of infection by powdery mildew (Erysiphe Graminis f.sp. hordei) and low temperature on the respiratory activity of winter barley.

McAinsh, Martin R. and Ayres, Peter G. and Hetherington, Alistair M. (1991) The effects of infection by powdery mildew (Erysiphe Graminis f.sp. hordei) and low temperature on the respiratory activity of winter barley. Physiological and Molecular Plant Pathology, 39 (1). pp. 13-23. ISSN 0885-5765

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Abstract

The rapid changes in respiratory metabolism that follow exposure of plants grown at cold temperatures to warm conditions have been investigated in barley infected by powdery mildew (Erysiphe graminis f.sp. hordei D. C. Marchal). Total rates of dark respiration, measured between 4 and 20 °C, were higher in cold-grown plants (9 ± 2 °C day, 4 ± 2 °C night) than in warm-grown plants (20 ± 2 °C). Infection caused an increase in respiration at all temperatures. Leaves from healthy cold-grown plants showed a marked change in the contribution of the individual components of total respiration in response to increasing temperature; cyanide-sensitive respiration dropped from 71·2 to 42·8%, while cyanide-insensitive respiration increased from 16·4% to 44·0%, over the temperature range 4−20 °C. Such changes were inhibited by mildew infection. Mlitochondrial respiration exhibited similar trends in response to temperature and infection. Mitochondria isolated from infected cold-grown barley exhibited a higher respiratory control index and a lower ADP:O ratio than those from healthy cold-grown plants. With the exception of a 16% reduction in the fructan fraction in infected barley, there were no significant (P < 0·05) differences in the carbohydrate contents of healthy and infected cold-grown plants. Temperature and infection-induced changes in the pattern of respiration are discussed with respect to plant carbohydrate status and modified mitochondrial efficiency.

Item Type: Article
Journal or Publication Title: Physiological and Molecular Plant Pathology
Uncontrolled Keywords: Erysiphe graminis f.sp. hordei ; barley ; respiration ; mitochondria ; cold ; powdery mildew
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: 26861
Deposited By: Dr Martin R McAinsh
Deposited On: 31 Jul 2009 11:32
Refereed?: Yes
Published?: Published
Last Modified: 26 Jul 2012 16:36
Identification Number:
URI: http://eprints.lancs.ac.uk/id/eprint/26861

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