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| Effects of Exogenous Sucrose on Growth and Quality of Lettuce under NO3- Stress |
| CHANG Li-li，SONG Shi-wei，CHEN Ri-yuan，LIU Hou-cheng，SUN Guang-wen* |
| College of Horticulture，South China Agricultural University，Guangzhou 510642，Guangdong，China |
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Abstract Taking conventional nutrient solution（7.5 mmol·L-1 NO3-）and foliar spraying water as CK，the influence of exogenous sucrose on the growth and quality of lettuce cultivated in nutrient solution under 75 mmol·L-1 NO3- stress was investigated by spraying sucrose of 0 mmol·L-1（T1），1 mmol·L-1（T2），5 mmol·L-1（T3）at the leaf surfaces．The results showed that the growth of lettuce（Lactuca sativa L.）was significantly restrained by T1 treatment and the VC content was significantly reduced．Exogenous sucrose treatment could alleviate the suppression of NO3- stress to the growth of lettuce and increase its VC content，and at the same time slightly reduce the nitrate content．Of all the 3 treatments，T2 had better result．Compared with the CK，T2 and T3 all could reduce the soluble protein contents in lettuce leaf，and T3 could increase the soluble suger content，but the difference was not significant．
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Received: 10 July 2013
Published: 05 September 2013
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