1. Zeiger, E. (1983) Ann. Rev. Plant Physiol. 34, 441–75
2. Mohl, von H. (1856) Botanische Zeiting 14, 697–704
3. Shaw, M. and Maclachlan, G.A. (1954) Can. J. Bot. 32, 784–94
4. Hsiao, T.C. (1976) in Encyclopedia of Plant Physiology (NS) 2B, 195–221
5. Shimazaki, K., Gotow, K. and Kondo, N. (1982) Plant Cell Physiol. 234, 871–79