ACKNOWLEDGEMENTS
We are grateful to Fang-Jen Lee for the gift of yeast BY4741,ysod2Δ , and ymtm1Δ lines that were obtained from the Saccharomyces Genome Deletion Project, Daniel J. Kliebenstein for kindly providing the antisera of Arabidopsis MnSOD, and Kuo-Chen Yeh for helping ICP-OES analysis. We would like to thank Lynne Stracovsky for editing, Hui-Chen Wu for commenting the manuscript, and Pei-Chun Hsieh for technical support. We also appreciate the NTU Confocal Microscope Laboratory for performing fluorescence imaging.