关键词: 甜高粱;含糖量;干物质;糖产量;相关分析;通径分析

Abstract:

Sweet sorghum (Sorghum biocolor L. Moench) is one of the key bio-energy crops. To improve its variety and cultivation method for high yield are of important significance in safeguarding energy supply and securing energy safety. Dry matter per plant and soluble sugar concentration of 30 conventional sweet sorghum varieties were measured under a lower density (15 000 plant/hm2) condition. The results showed that the ranking of direct path coefficient contributed to the SY at maturity were: dry matter and sugar content before heading (DMBH, SCBH), ratio of dry matter after heading (RDMAH) and sugar content after heading (SCAH). The direct path coefficient was similar to their correlation coefficient between DMBH and SY, indicating DMBH was crucial for affecting SY. Since SCBH had a high correlation with DMBH, it then presented a significantly positive effect on SY. SCAH was strongly and negatively correlated with DMBH that its positive effect was smaller compared to the greater negatively indirect effect to SY. RDMAH showed a highly negative interrelationship with SY, mainly because its indirect affects though both SC and DM at heading were larger than its own direct value. Therefore, on the basis of increasing stem sugar contents before and after heading, to obtain high dry matter accumulation before heading is an important breeding target for selecting and breeding sweet sorghum varieties with high sugar yield.

Key words: sweet sorghum, sugar content, dry matter, sugar yield, correlation analysis, path analysis