1. Umea Plant Science Center, Department of Plant Physiology, Umea University, 901 87 Umea, Sweden (R.B., Jo.K., H.B., S.J.B., Ja.K., Per. G., Pet. G., S.J.); and
2. Department of Biotechnology, Kungliga Tekniska Högskolan, Royal Institute of Technology, Stockholm Center for Physics, Astronomy, and Biotechnology, 106 91 Stockholm, Sweden (F.S., R.E., J.L.)