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| Effects of Salt Stress on Chlorophyll Content and Chloroplast Ultra-structure of Different Salt-tolerant Cucumber Varieties |
| ZHANG Jing-yun,WU Feng-zhi* |
| College of Horticulture,Northeast Agricultural University,Harbin 150030,Heilongjiang,China |
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Abstract 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.
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Received: 06 September 2008
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