| Effects of exogenous spermidine on photosynthesis of tomato seedlings under drought stress |
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| DOI：10.7606/j.issn.1000-7601.2010.03.33 |
| Key Words: drought stress tomato spermidine photosynthesis |
| Author Name | Affiliation | | ZHANG Chunmei | Department of Agricuural Science, Hexi Unirersity, Zhangye, Gansu 734000，China
Department of Horticulture, Northwoest A & F Universiy, Yangling，Shaanxi 712100, China | | ZOU Zhirong | Department of Horticulture, Northwoest A & F Universiy, Yangling，Shaanxi 712100, China | | HUANG Zhi | Department of Horticulture, Northwoest A & F Universiy, Yangling，Shaanxi 712100, China | | ZHANG Zhixin | Department of Horticulture, Northwoest A & F Universiy, Yangling，Shaanxi 712100, China |
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| Abstract: |
| Two cultivars were used 8as test materials and the effect of exogenous spemmidine (Spd) on photosynthesis of tomato (Lycopersicon esculentum M.) seedlings under drought stress induced by 7.5 % polyethylene glycol (PEG6000)was studied in hydroponics culture . The esults showed that drought stress caused a significant decrease in the net photo-synthetic rate(Pn) ，transpiration rate(Tr) ，stomatal conductance( Gs) and intercelular CO2 concentration(Ci) of tomato seedlings. The intracellular CO2 concentration(Ci) was significantly higher than that of the control during the later period of drought stress, which suggested that the decrease in Pn in tomato seedlings’leaves mainly resulted from the stomatal
limitation during the earlier period of stress, but non-stomatal limitation during the later period. Compared with the drought treatment, exogenous Spd increased Pn, Gs and Tr in the seedling leaves of the two tomato cultivars and de-creased Ci during the later period under drought stress. These results indicated that exogenous Spd could improve photo-synthesis of tomato seedlings by preventing stoma closure and stimulating CO2 uptake. The mitigative effects of exogenous Spd in drought-sensitive cv. Huangguan were greater than those in high drought-resistant cv. Maofen802. |
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