Relationships between the appearance of low-molecular-weight heat-shock proteins (LMW HSPs) in maize, winter wheat, and winter rye mitochondria and the tolerance of the mitochondria to hyperthermia (42°C, 3 h) were studied using one-dimensional SDS-PAGE, immunochemical methods, and polarography. Heat shock inhibited respiration to a greater extent in the wheat and rye than in the maize mitochondria. A single 20-kD LMW HSP was found both inside and on the surface of mitochondria isolated from heat-treated wheat and rye seedlings. After heating maize seedlings, two LMW HSPs (28 and 23 kD) appeared inside the mitochondria, and three proteins (22, 20, and 19 kD) appeared on their surface. We suppose that the latter three proteins play an essential role in the protection of mitochondria from hyperthermic damage. It seems likely that the diversity of the hyperthermia-induced LMW HSPs in plant mitochondria affects their thermal stability.
Russian Journal of Plant Physiology – Springer Journals
Published: Oct 10, 2004
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