Three Phaseolus vulgaris Linn.varieties,Xingkonghong,Youdoubao and Jiangjunyidianhong were investigated the heat tolerance of high temperature of 36℃.The results showed that Youdoubao and Xingkonghong had stronger heat tolerance.Comparing with the control,their chlorophyll content and relative electrical conductivity(REC)showed no significant difference,while proline(PRO)increased significantly.Additionally,for Youdoubao,its malondialdehyde(MDA)content changed miner.The heat tolerance of Jiangjunyidianhong was weak,its chlorophyll content decreased significantly and PRO remained unchanged,the REC and MDA increased significantly.All the three varieties antioxidant enzymes(SOD and CAT)activities were increased.In conclusion,Youdoubao and Xingkonghong are more suitable for cultivation in high temperature environments,especially in the area of south of the Yangtze River.
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