1. Department of Plant Sciences Faculty of Biological Sciences Kharazmi University Tehran 15719‐14911 Iran
2. Missouri Botanical Garden 4344 Shaw Blvd. St Louis MO 63110 USA
3. California State University, Sacramento 6000 J St. Sacramento CA USA
4. Department of Physics Carnegie Mellon University 5000 Forbes Ave. Pittsburgh PA 15213 USA
5. Department of Botany and Plant Ecology Weber State University 1415 Edvalson St., Dept. 2504 Ogden UT 84408 USA