| Effects of exogenous spermidine on metabolism of nonstructural carbonhydrate and involved activity of enzymes of tomato seedlings under drought stress |
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| DOI：10.7606/j.issn.1000-7601.2012.01.25 |
| Key Words: drought stress tomato Spermidine nonstructural carbonhydrate enzymes |
| Author Name | Affiliation | | YAN Gang | College of Agriculture and Biology Technology, Hexi University, Zhangye, Gansu 734000, China；
Kairuite Limited liability company of Jiayuguan City, Jiayuguan, Gansu 735100, China | | ZHANG Chunmei | College of Agriculture and Biology Technology, Hexi University, Zhangye, Gansu 734000, China | | ZOU Zhirong | Department of Horticulture, Northwest A & F University, Yangling, Shaanxi 712100, China |
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| Abstract: |
| The effect of Exogenous Spermidine on metabolism of nonstructural carbonhydrate and involved activity of enzymes of tomato(Lycopersicon esculentum M.) seedlings under drought stress induced by 7.5% polyethylene glycol (PEG6000) was studied in hydroponics culture. Results showed that exogenous foliar spraying Spd increased the contents of sucrose, glucose and fructose in leaves, and decreased the content of starch in leaves, In addition, exogenous Spd increased activities of sucrose synthase and sucrose phosphate synthase. These two enzymes cooperated in order to accelerate the synthesis of sucrose, so that the sucrose and hexose accumulated which lowered the osmotic potential of cells, the osmotic potential decreased subsequently, maintaining turgor pressure of cells, and the ability of seedlings resisting drought stress was improved. It indicated that regulation of carbohydrate metabolism with exogenous Spd was an important mechanism of alleviating the harm of drought stress to tomato seedlings. |
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