甜高粱茎秆汁液锤度与可发酵糖含量的关系

Relationship between Brix Value and Fermentable Sugar Content in Sweet Sorghum Juice

甜高粱茎秆富含糖分,是生产燃料乙醇的良好原料。在甜高粱育种或生产中,常用锤度估算汁液含糖量,但锤度与可发酵糖的关系还不是很清楚。本文采用81个甜高粱材料,种植于北京、天津(盐碱地)、河北3个地点,研究了茎秆汁液锤度与可发酵总糖和蔗糖含量的关系。结果表明,北京、河北、天津三个地点甜高粱茎秆汁液总糖/锤度(糖锤比)总平均值分别为0.76、0.74和0.72,其中天津的甜高粱茎秆汁液糖锤比显著低于北京。北京、河北、天津三个地点甜高粱茎秆汁液锤度与总糖、蔗糖含量的相关性均达极显著水平,相关系数分别为0.8911,0.8376和0.9186,其中天津点显著低于河北。适合北京和河北非盐碱地种植的甜高粱茎秆汁液的锤度、可发酵总糖含量的整合回归方程为Y=0.8969X-1.7576(R2=0.8237);天津盐碱地糖锤比低于北京,相关系数显著低于河北,故其回归方程Y=0.9343X-3.1726(R2=0.7015)只可供其它盐碱地区参考。锤度和糖锤比的相关系数显著低于总糖含量和糖锤比的相关系数,说明含糖量高,锤度也高,但锤度高,含糖量不一定高。该结果对于甜高粱育种和加工工艺设计具有重要参考价值。

Sweet sorghum has been regarded as an important energy crop for bioethanol production.It is of significance for sweet sorghum breeder or producer to understand the relationship between brix value and fermentable sugar content.Using 81 sweet sorghum accessions as experimental materials,planting in 3 different locations,the relationship between brix value and contents of total fermentable sugar and sucrose was studied.The results showed that the average ratios of total sugar content to brix（TS/Bx） were respectively 0.76,0.74 and 0.72 in Beijing,Hebei and Tianjin experimental sites.The brix value was significantly related with total fermentable sugar content in all locations,with the coefficients,0.8911,0.8376 and 0.9186.Those correlation coefficients in Beijing and Hebei were not significant,so they could be integrated into one regression equation,Y=0.8969X-1.7576（R2=0.8237）.The correlation coefficient in Tianjin was significantly different from that in Hebei,and significantly lower in TS/BX,so the regression equation in Tianjin cloud only used in saline-alkaline area,Y=0.9343X-3.1726（R2=0.7015）.