1. Key Laboratory of Bio-Resource and Eco-Environment of Ministry of Education, College of Life Sciences, State Key Laboratory of Hydraulics and Mountain River Engineering, Sichuan University, Chengdu, Sichuan, China
2. Royal Botanic Garden Edinburgh, Edinburgh, UK
3. Department of Botany, University of British Columbia, Vancouver, Canada
4. Institute of Molecular Plant Science, School of Biological Science, University of Edinburgh, Edinburgh, UK