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Frontiers of Agriculture in China

ISSN 1673-7334

ISSN 1673-744X(Online)

CN 11-5729/S

Front. Agric. China    2008, Vol. 2 Issue (1) : 55-60     DOI: 10.1007/s11703-008-0015-5
Effects of exogenous spermidine on the photosynthesis of L. seedlings under rhizosphere hypoxia stress
WANG Tian1, WANG Suping2, GUO Shirong2, SUN Yanjun2
1.School of Forestry and Landscape Architecture, Anhui Agricultural University; 2.College of Horticulture, Nanjing Agricultural University
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Abstract With water culture, this paper studied the effects of exogenous spermidine (Spd) on the net photosynthetic rate (Pn), intercellular CO2 concentrations (Ci), stomatal conductance (Gs), transpiration rate (Tr), apparent quantum yield (?c), and carboxylation efficiency (CE) of cucumber seedlings under hypoxia stress. The results showed that Pn decreased gradually under the hypoxia stress, and reached the minimum 10 days later, which was 63.33% of the control. Compared with that of the hypoxia-stressed plants, the Pn 10 days after the application of exogenous Spd increased by 1.25 times. A negative correlation (R2 = 0.473–0.7118) was found between Pn and Ci, and Gs and Tr changed in wider ranges, which decreased under the hypoxia-stress, but increased under the hypoxia-stress plus exogenous Spd application. There was a significant positive correlation between Gs and Tr (R2 = 0.7821–0.9458), but these two parameters had no significant correlation with Pn. The hypoxia stress induced a decrease of ?c and CE by 63.01% and 72.33%, respectively, while the hypoxia stress plus exogenous Spd application made ?c and CE increase by 23% and 14%, respectively. The photo-inhibition of cucumber seedlings under hypoxia stress was mainly caused by non-stomatal inhibition, while the exogenous Spd alleviating the hypoxia stress by repairing photosynthesis systems.
Issue Date: 05 March 2008
 Cite this article:   
WANG Suping,WANG Tian,GUO Shirong, et al. Effects of exogenous spermidine on the photosynthesis of L. seedlings under rhizosphere hypoxia stress[J]. Front. Agric. China, 2008, 2(1): 55-60.
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