Abstract
The specific physiological functions of different catalase isoforms remain unclear. To determine the different functions of rice catalase (Cat) isoforms, we investigated the dependency of rice catalase gene expression patterns on organs, photoperiods, and the circadian clock. In addition, an over-expression transgenic approach was used. CatA expression displayed photoperiod-dependent and circadian regulation in the leaves. In contrast, CatC exhibited light-dependent regulation. CatB transcripts also displayed diurnal oscillation in the roots. However, these three isoforms displayed different diurnal oscillation patterns. Over-expressed CatA and CatC, but not over-expressed CatB, improved drought stress tolerance; over-expressed CatB exhibited root growth inhibition. From our results and previously reported data, we propose that rice CatA (class II), CatB (class III), and CatC (class I) are involved in the environmental stress response, the regulation of ROS levels or homeostasis related to root growth regulation, and photorespiration, respectively.
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Joo, J., Lee, Y.H. & Song, S.I. Rice CatA, CatB, and CatC are involved in environmental stress response, root growth, and photorespiration, respectively. J. Plant Biol. 57, 375–382 (2014). https://doi.org/10.1007/s12374-014-0383-8
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DOI: https://doi.org/10.1007/s12374-014-0383-8