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Plant and Cell Physiology, 1985, Vol. 26, No. 1 47-52
© 1985

Article

Effect of Heat Stress on Photosynthetic Activity and Chloroplast Ultrastructure in Correlation with Endogenous Cytokinin Concentration in Maize Seedlings

Marleen Caers1, Patrick Rudelsheim2, Henri Van Onckelen2 and Stefaan Horemans2

1 Laboratorium voor Plantenfysiologie van K. U. Leuven, Kardinaal Mercierlaan 92, B-3030 Heverlee, Belgium
2 Department of Biology UIA, B-2610 Wilrijk, Belgium

The effect of heat stress (47.5°C for 2 min given to the roots) on photosynthetic activity and chloroplast ultrastructure was studied in correlation with the endogenous cytokinin concentration in maize (Zea mays L. "Fronica") seedlings.

Shoot and root growth were visibly inhibited by the heat treatment. In etiolated leaf segments there was a clear-cut inhibition of photosynthetic activity, chlorophyll accumulation and chloroplast development. This inhibition was reversible by benzyladenine. In green tissue heat stress only affected photosynthetic activity and chlorophyll accumulation. Again this inhibition could be reversed by benzyladenine.

In the primary leaves of green seedlings heat stress lowered cytokinin concentration severely; in etiolated leaves no effect of heat stress could be observed, since the cytokinin concentration was below the detectable level.

Our results provide an indication for a correlation between hormonal control and chloroplast biogenesis.

(Received July 5, 1984; Accepted October 12, 1984)
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