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Iron Superoxide Dismutase Protects against Chilling Damage in the Cyanobacterium Synechococcus species PCC79421

David J. Thomas, Jannette B. Thomas, Shane D. Prier, Nicole E. Nasso, and Stephen K. Herbert*

University of Idaho, Department of Biological Sciences, Moscow, Idaho 83844-3051

A strain of Synechococcus sp. PCC7942 lacking functional Fe superoxide dismutase (SOD), designated sodB-, was characterized by its growth rate, photosynthetic pigments, inhibition of photosynthetic electron transport activity, and total SOD activity at 0°C, 10°C, 17°C, and 27°C in moderate light. At 27°C, the sodB- and wild-type strains had similar growth rates, chlorophyll and carotenoid contents, and cyclic photosynthetic electron transport activity. The sodB- strain was more sensitive to chilling stress at 17°C than the wild type, indicating a role for FeSOD in protection against photooxidative damage during moderate chilling in light. However, both the wild-type and sodB- strains exhibited similar chilling damage at 0°C and 10°C, indicating that the FeSOD does not provide protection against severe chilling stress in light. Total SOD activity was lower in the sodB- strain than in the wild type at 17°C and 27°C. Total SOD activity decreased with decreasing temperature in both strains but more so in the wild type. Total SOD activity was equal in the two strains when assayed at 0°C.

1   This work was supported by the National Science Foundation Experimental Program to Stimulate Competitive Research and by the U.S. Department of Agriculture (grant no. 9801783) to S.K.H. and Philip A. Youderian.
*   Corresponding author; e-mail skherbe{at}uidaho.edu; fax 1-208-885-7905.

Plant Physiol. (1999) 120: 275-282
Copyright Clearance Center:   0032-0889/99/120//08
© 1999 American Society of Plant Physiologists




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