Effect of salt-stresses on the hormonal regulation of growth, photosynthesis and distribution of 14C - assimilates in bean plants

The experiments were carried out to study the effect of salt-stresses and ABA on the growth photosynthesis and translocation of assimilates in bean plants. It was planned to reduce the content of GA3 and cytokinins and increase ABA content in salinized plants. The results show that salt-stress (NaCl and concentrated nutrient solution), reduces all the investigated processes in a different degree. NaCl-stress retarded most seriously growth of apical part and blades in contrast to 7-times concentrated nutrient solution decreasing mainly the rate of root and blade growth. Photosynthesis and 14C-translocation of 14C-assimilates were retarded more seriously by NaCl than by 7-times concentrated nutrient solution. In the case of seriously stressed plants GA3 and cytokinins (more effectively) reversed the negative effect of stress conditions both on the photosynthesis and on the 14C-translocation. On the basis of the obtained results, it seems that changes in the rate of investigated processes in salinized plants are due to hormonal disturbances which cause directly or indirectly retardation of photosynthesis and translocation of assimilates. (author)