About the Authors

Charles Hall

Affiliation Department of Plant and Microbial Biology, University of California, Berkeley, California, United States of America

Juliet Welch

Affiliation Department of Plant and Microbial Biology, University of California, Berkeley, California, United States of America

David J. Kowbel

Affiliation Department of Plant and Microbial Biology, University of California, Berkeley, California, United States of America

N. Louise Glass

Lglass@berkeley.edu

Affiliation Department of Plant and Microbial Biology, University of California, Berkeley, California, United States of America

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

Conceived and designed the experiments: CH NLG. Performed the experiments: CH JW DJK. Analyzed the data: CH JW DJK NLG. Wrote the paper: CH NLG.