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| Physiological Response to High Temperature Stress in Radish Seedlings with Different Heat Tolerance |
| WU Bin, JIANG Qiu-wei, GU Ting-ting, ZHAO Mei, LIU Li-wang* |
| National Key Laboratory of Crop Genetics and Germplasm Enhancement, College of Horticulture, Nanjing Agricultural University, Nanjing 210095, Jiangsu, China |
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Abstract Under high temperature stress（38 ℃）, the variation of MDA, soluble protein,
soluble sugar, free proline contents in radish（Raphanus sativus L.）seedling with different heat resistance were analyzed. The soluble protein content was higher in heat resistant inbred lines than that in heat-sensitive ones, while the content of soluble sugar, free proline and MDA exhibited no significant difference among inbred lines. Under the treatments of 38 ℃ for 24 h, 48 h and 72 h, the contents of soluble protein, soluble sugar and free proline in heat resistant inbred lines were significantly higher than those in heat-sensitive ones, while the MDA content was significantly lower in heat resistant materials. Under the treatment of 38 ℃ for 24 h, the contents of all the 4 indexes were significantly increased. The soluble protein content declined continuously for 48 h and 72 h, but it declined much slowly in heat resistant inbred lines. As compared with the treatment of 38 ℃ for 24 h, the contents of soluble sugar, free proline and MDA were significantly higher for 48 h in heat-sensitive materials, while in heat resistant materials, there were no significant increases for 48 h and 72 h. It was suggested that the variation of these 4 indexes was related with the heat resistance and could be used for evaluation of heat resistance in radish seedlings.
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Received: 01 December 2009
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Corresponding Authors:
LIU Li-wang
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