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| Effect of Proline on Heat Tolerance of Brassica campestris L. ssp. chinensis var. utilis Tsen et Lee under High Temperature Stress |
| CAO Yi1，LI Chun-mei2，DENG Yi1，LIU Yong-cong1 |
| 1Department of Horticulture，Foshan Science and Technology College，Foshan 528231，Guangdong，China|2Department of Lab and Equipment Management，Foshan Science and Technology College，Foshan 528000，Guangdong，China |
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Abstract Effects of different proline concentrations on heat tolerance of ‘50 tianyouqingcaixin’（Brassica campestris L．ssp．chinensis var．utilis Tsen et Lee）during seedling period and in fields were studied．The result of seedling experiment showed that the heat injury index，leakage of electrolyte in leaves of flower stalk increased continuousely along with the prolonging of high temperature stress．With the treatment of Pro concentration in 150-200 mg•L-1 under 8-12 h high temperature stress，the heat injury index and leakage of electrolyte were reduced obviously．The SOD and POD activities were increased obviously．The result of field experiment showed that the treatment of Pro in 150-200 mg•L-1 could obviously promote the leaf growth，increase leaf area，improve flower stem and root weights，and enhance the contents of soluble sugar，soluble protein and VC．All these results indicated that proline could relieve flower stalk damage by boosting antioxidant activity and maintaining osmotic adjustment ability under high temperature stress．
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Received: 20 April 2011
Published: 17 June 2011
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