Abstract: In a pot experiment with brown-yellow soil,this paper studied the effects of different concentration selenium on the growth and activated oxygen scavenging system of Oryza sativa.The results showed that low concentration Se (<8 mg·kg^-1) had a promoting effect on the wheat biomass,chlorophylla, chlorophyll a/b,and activated oxygen-scavenging system,while high concentration Se (>16 mg·kg^-1) was in adverse.Soil Se concentration had a significant correlation with root biomass,shoot biomass,chlorophyll a/b, MDA, SOD,CAT,POD.It was defined by the pot experiment that 10% inhibition rate of root or shoot biomass could be regarded as critical value,and the critical content of soil Se was estimated to be 21 mg·kg^-1.

Key words: Wenchang fowl, Germplasm characteristics, RAPD, Genetic diversity