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Over-expression of chloroplast-targeted Mn superoxide dismutase in cotton (Gossypium hirsutum L., cv. Coker 312) does not alter the reduction of photosynthesis after short exposures to low temperature and high light intensity

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Abstract

Transgenic cotton plants from several independently-transformed lines expressing a chimeric gene encoding a chloroplast-targeted Mn superoxide dismutase (SOD) from tobacco exhibit a three-fold increase in the total leaf SOD activity, strong Mn SOD activity associated with isolated chloroplasts, and a 30% and 20% increase in ascorbate peroxidase and glutathione reductase activities, respectively. The Mn SOD plants did exhibit a slightly enhanced protection against light-mediated, paraquat-induced cellular damage but only at 0.3 µM paraquat. In addition, photosynthetic rates at 10°C and 15°C were similar to those of controls, and the immediate recovery of photosynthesis after a 35-min exposure to 5°C and full sun was only slightly better than that for wild-type plants. The recovery for longer exposure times was comparable for both genotypes as was the deactivation of the H2O2-sensitive, Calvin-cycle enzyme, stromal fructose 1,6-bisphosphatase (FBPase). Compared to the controls, Mn SOD plant leaves in full sun prior to chilling stress had a lower activation of FBPase, a higher ratio of oxidized to reduced forms of ascorbate, and a higher total glutathione content. After 35 min at 5°C in full sunlight, total glutathione had risen in control leaves to 88% of the Mn SOD plant values, and oxidized to reduced ascorbate ratios were higher for both genotypes. However, an 80% increase in the ratio of oxidized to reduced glutathione occurred for Mn SOD plant leaves with no change for controls. This increased demand on the ascorbate-glutathione cycle is circumstantial evidence that high Mn SOD activity in the chloroplast leads to increased H2O2 pools that could, in some manner, affect photosynthetic recovery after a stress period. We postulate that the pool sizes of reduced ascorbate and glutathione may restrict the ability of the ascorbate-glutathione cycle to compensate for the increased activity of SOD in cotton over-producing mitochondrial Mn SOD in chloroplasts during short-term chilling/high light stress.

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Authors and Affiliations

  1. Department of Biological Sciences, Texas Tech University, Lubbock, TX, 79409-3131

    Paxton Payton, Randy D. Allen & A. Scott Holaday

  2. Department of Plant and Soil Sciences, Texas Tech University, Lubbock, TX, 79409-3131

    Randy D. Allen

  3. Biotex, Inc., Lubbock, TX, USA

    Norma Trolinder

Authors
  1. Paxton Payton
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  2. Randy D. Allen
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  3. Norma Trolinder
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  4. A. Scott Holaday
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Payton, P., Allen, R.D., Trolinder, N. et al. Over-expression of chloroplast-targeted Mn superoxide dismutase in cotton (Gossypium hirsutum L., cv. Coker 312) does not alter the reduction of photosynthesis after short exposures to low temperature and high light intensity. Photosynthesis Research 52, 233–244 (1997). https://doi.org/10.1023/A:1005873105596

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