Abstract
Tomato seedling was treated under different concentration of NaCl ranged from 0 to 300 mM. Effects of salt stress on the content of growth and osmotic adjustment substance, the superoxide dismutase (SOD), peroxidase (POD), catalase (CAT), and ascorbate peroxidase (APX) activities and generation rate of O2 .- of tomato seedling were studied. The result showed that the content of fresh weight (FW), dry weight(DW), K + , K + / Na + and soluble sugar(SS) decreased with the increasing of NaCl concentration. Conversely, the contention of Na + , Proline and malondialdehyde (MDA), SOD, POD, CAT and APX activities and generation rate of O2 .- increased. Growth of seedling shoots was suppressed by salt treatment. Osmotic adjustment substance play a critical role in the growth of tomato seedling under the condition of salt stress, and meanwhile the continual increasing bioactivity of antioxidant enzymes could scavenge reactive oxygen species (ROS) resulted from salt stress to exert the existence of tomato seedling.
Highlights
Salt stress is one of the mainly environmental factors interfering with the growth, development and biomass production of plants
In the treatments of different saline contention, the growth of tomatoes varied obviously and suppressed by salt stress, which was associated with salt content
Results showed that the growth of tomato seedlings was suppressed by salt treatment, but survived due to the water content and degree of succulence
Summary
Salt stress is one of the mainly environmental factors interfering with the growth, development and biomass production of plants. 20% of the world's cultivated land and nearly half of all irrigated lands are affected by salinity 300 million mu cultivated land in China is affected by salinity, which occupies 25% of arable land. Salinity has been one of the cardinal factors affecting the development of social economy Tomato belongs to fruit vegetable of horticulture crops, and its flesh is applied as salad and ingredients of food, and fresh food. It is one of the important routine fruits and vegetables. Study on the physiological responses of tomato seedlings to salt stress could give novel insight into the planting and modifying of tomato cultivars
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