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The seeds of six Chamaecrista spp.carried by spaceship and the effects on SP1 generation were studied.The results showed that the germination rates of 2204,2217,34721 and 92985 were increased;the plant height of 86134 was decreased and its branch number was increased,the leaf length of 2204 was decreased,the leaf width of 2217 was decreased;the biomasses of 34721 and 86134 were decreased;the durations of reproductive growth of six Chamaecrist varieties were changed significantly;and the contents of phosphorus and potassium of the cultivar of 86134 were increased.