1. Rasmussen, G.K., Furr, J.R., Cooper, W.C.: J. Am. Soc. Hort. Sci. 94, 640 (1969)
2. Garcia, F.G., Einset, J.W.: Ann. Bot. 51, 287 (1983)
3. Chrominski, A., et al.: Plant Cell Envir. (submitted)
4. Sakai, S., Imaseki, H.: Plant Cell Physiol. 12, 349 (1971)