1. Department of Environmental Science, Faculty of Science, Chulalongkorn University, 254 Phayathai Road, Pathumwan, Bangkok 10330, Thailand
2. Department of Botany, Faculty of Science, Chulalongkorn University, 254 Phayathai Road, Pathumwan, Bangkok 10330, Thailand
3. Office of the University Research Affairs, Chulalongkorn University, 254 Phayathai Road, Pathumwan, Bangkok 10330, Thailand
4. FRS(T), the Academy of Science, The Royal Society of Thailand, Dusit, Bangkok 10300, Thailand