ZHANG Jing-yun;WU Feng-zhi*
. 2009, 1(10): 13-16.
Taking concentration of 225 mmol·L-1 NaCl solution to treat different salt-tolerant cucumber varieties,the effects of salt stress on chlorophyll content and chloroplast ultra-structure were studied.The results showed that under certain concentration of NaCl,at the initiate stage of salt stress,there were not many changes in salt-tolerant varieties.The chlorophyll contents of salt-tolerant and salt-sensitive varieties decreased significantly as salt stress last for a long time,but the decrease range of salt-tolerant varieties is smaller than that of salt-sensitive varieties.At the same time,salt stress could harm the chloroplast membrane system,accelerate the aging of chloroplast,disintegrating gradually the layer,shaping the contour changes,and changing the linage direction of internal layers,and arising a minor expansion,decreasing the number of tablets layers,simplifying the internal structure until total collapse.But the changing degree of salt-tolerant varieties is less than that of salt-sensitive varieties.
