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Plant and Cell Physiology, 1985, Vol. 26, No. 8 1493-1498
© 1985

Article

Solute Leakage in Soybean Seedlings under Various Heat Shock Regimes

Chu-Yung Lin1,3, Yih-Ming Chen1 and Joe L. Key2

1 Department of Botany, National Taiwan University Taipei, Taiwan, ROC
2 Department of Botany, The University of Georgia Athens, Georgia 30602, U.S.A.

3 To whom correspondences should be addressed

The leakage of solute from intact seedlings during incubation under various heat shock (HS) regimes was studied. Continuous HS at 40°C did not induce leakage of amino acids, soluble sugars and electrolytes into the incubation medium, when compared with control incubation at 28°C. Continuous HS at 45°C (lethal treatment) caused leakage to increase continuously and linearly during a 5-h treatment period. However, brief HS at 47.5°C, (lethal treatment), unlike continuous HS at 45°C, induced leakage at a slower rate which reached a plateau within 2 to 3 h at 28°C. Preincubation for 2 h at 40°C completely prevented the leakage caused by the brief HS at 47.5°C, but not that caused by continuous 45°C HS. The amount of leakage during 2 h of incubation at 45°C was reduced to half by 30 min preincubation at 40°C and was reduced to a minimal level by 1-h preincubation. Greater reduction of leakage at 45°C HS was observed when an additional 4 h of incubation at 28°C immediately followed the 40°C preincubation. These results and previous findings (Lin et al. 1984) indicate that the synthesis and accumulation of HS proteins (HSPs) are important for preventing HS-induced leakage from the cells. One of the HSPs, 15 kD in size appeared to be associated with the plasma membrane.

(Received February 12, 1985; Accepted August 30, 1985)
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