Abstract
Amaranthus tricolor is an unique C4 plant which produces three-colors in leaves, green apices, yellow middle, red basal regions before the onset of flowering. We previously reported that the yellow and red regions possessed greatly reduced levels of Chl, less than 10 % of the green regions although the net photosynthetic CO2 fixation rates of yellow and red regions were about 40 % of the green regions (Plant Cell Physiol. 40, 668-674 (1999)). Here, we examined the expression of choline monooxygenase genes from Amaranthus tricolor. Upon salt stress, the levels of choline monooxygenase and betaine increased in both green regions as well as red and yellow regions. Changes of the levels of glycinebetaine and choline monooxygenase upon the changes of salinity were investigated. We also examined the efects of choline precursors on the accumulation levels of glycinebetaine. These results will be presented.
