[1] Lawrence Berkeley Natl Lab, Joint BioEnergy Inst, Berkeley, CA 94720 USA
[2] Univ Adelaide, Sch Agr Food & Wine, Waite Res Inst, Waite Campus, Glen Osmond, SA 5064, Australia
[3] Univ Calif Berkeley, Dept Plant & Microbial Biol, Berkeley, CA 94720 USA