Plant Physiol. Journal of Pharmacology and Experimental Therapeutics
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Plant Physiology 70:1405-1409 (1982)
© 1982 American Society of Plant Biologists

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An Assessment of Phase Transitions in Soybean Membranes

Sharman D. O'Neill1 and A. Carl Leopold

Boyce Thompson Institute for Plant Research, Cornell University, Ithaca, New York 14853

Phase transitions were measured in vesicles of phospholipids, alone and in various combinations, and in pelleted mitochondrial membranes, using thermal (DSC) and optical methods. The objective was to consider their possible involvement in chilling injury of soybeans (Glycine max [L.] Merr. cv Wayne 1977). Saturated phospholipids showed clear transitions in the temperature range of 50°C to near 0°C. When mixtures of two phospholipids were examined, there was a marked lowering and broadening of the transition peaks, and a shift in the transition temperatures to intermediate temperatures. The unsaturated phospholipids that occur naturally in soybeans showed no detectable phase transitions in this temperature range, alone or in combinations. Examination of the polar lipids from soybean asolectin revealed no transitions in the biological temperature range; the additions of cations such as Ca2+ and La3+ did not evoke a detectable phase transition in them. Mitochondrial membrane pellets likewise showed no transitions. The application of these two direct methods of examination of membrane components without the addition of foreign agents did not support the suggested occurrence of a bulk phase transition which could be related to chilling injury in soybeans.

1 Present address: Section of Plant Biology, Cornell University, Ithaca, NY 14853.




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J. M. A. Grime, M. A. Edwards, N. C. Rudd, and P. R. Unwin
Quantitative visualization of passive transport across bilayer lipid membranes
PNAS, September 23, 2008; 105(38): 14277 - 14282.
[Abstract] [Full Text] [PDF]


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