Article citationsMore>>
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http://dx.doi.org/10.1126/science.1150646
has been cited by the following article:
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TITLE:
Maintenance of Normal Stress Tolerance in the Moss Physcomitrella patens Lacking Chloroplastic CuZn-Superoxide Dismutase
AUTHORS:
Yuya Higashi, Katsuaki Takechi, Hiroyoshi Takano, Susumu Takio
KEYWORDS:
Chloroplast, Knockout Mutant, Physcomitrella patens, Stress Tolerance, Superoxide Dismutase
JOURNAL NAME:
American Journal of Plant Sciences,
Vol.6 No.5,
March
12,
2015
ABSTRACT: Superoxide dismutases (SODs) catalyze the dismutation of superoxide and play an important role in reducing oxidative stress in plants. Based on in-gel SOD activity staining, chloroplasts of the moss Physcomitrella patens have two CuZn-SODs as the major SOD isozymes and minor SODs, including a Fe-SOD and two Mn-SODs. To investigate the contribution of chloroplastic SODs to stress tolerance in P. patens, we generated a double mutant lacking chloroplastic CuZn-SOD genes. The mutant did not show any differences in comparison to the wild type based on the growth of protonemata on normal and high-salt media, extractable activities of the other SODs after culture on normal and high-salt media, and inhibition of Fv/Fm under stress conditions (high-salt, high-light, and high-temperature). These results indicate that chloroplastic CuZn-SODs do not play a principal role in oxidative stress tolerance in chloroplasts under the investigated conditions. These findings explain the previously reported unusual response of P. patens to copper deficiency, in which chloroplastic CuZn-SODs are preferentially inactivated but cytosolic CuZn-SODs are unaffected.
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