Research on sugar content in different internode of sorghum__

[Objective] The study aimed to screen the new sorghum provenance and expand the genetic basis so as to provide the theoretical basis for the sweet sorghum breeding.[Method] With 19 grain sorghums and 20 sweet sorghums as the tested materials,the accumulation law of the sugar content in the sorghum stalks was studied.[Result] There was a obvious difference on the sugar content between the grain sorghum and the sweet sorghum.The accumulation starting point of the sugar content in the sweet sorghum and its sugar content in the stalks were all higher than that in the grain sorghum.But total tendencies of sugar accumulation in 2 varieties were consistent,their change trend of the sugar contents from the base to the top with the internode all had 4 types and the low-high-low changes were in the majority.[Conclusion] The study provided the reference for breeding the sweet stem sorghum,improve the lodging resistance and disease resistance and other characters of sweet sorghum variety