不同种植密度对甜高粱糖分积累及SS、SPS活性的影响

对甜高粱2个品种XT-2、T601设置7个不同种植密度处理，分析了甜高粱不同生育阶段总糖含量、还原糖含量、蔗糖含量、SS和SPS活性的变化。2个品种的总糖含量随生长进程均升高，成熟期达最高值。其还原糖的变化趋势不一致，XT-2呈升高-平缓-降低的趋势，T601呈升高-降低的趋势。2个品种在整个生育期蔗糖含量均呈升高的趋势，成熟期达最高值。T601除密度处理B6 (6170株 hm^–2)外其他处理SS活性均呈升高-降低-升高的趋势，XT-2无明显规律。XT-2除密度处理B2 (11 110株 hm^–2)、B4 (7929株 hm^–2)外其他处理SPS活性均呈升高-降低-升高的趋势，T601无明显规律。综上所述，甜高粱品种XT-2最适于糖分积累的密度为9250 株 hm^–2，成熟期总糖含量达14.2% (鲜基)，T601的最适密度为11 110株 hm–2，成熟期总糖含量达14.31%(鲜基)，作为积累糖的原料，后者为最佳选择。完熟期SS活性下降、SPS活性上升有利于糖的积累，为最佳收获时期。

Effects of Different Planting Densities on Sugar Accumulation and Activities of Sucrose Synthase and Sucrose Phosphate Synthase of Sweet Sorghum bicolor (L.) Moench

Two sweet sorghum varieties (XT-2 and T601) with seven different planting densities of treatments, were need to analyze the reducing sugar, total sugar content, sucrose content, activities of SS and SPS at different growing stages. The total sugar content in two varieties had the same, increasing tendency with the highest value at mature period.The reducing sugar content changed in a tendency of increasing maintaining decreasing in XT-2, and in a tendency of increasing, reducing in T601. The sucrose contents of the two varieties showed the same increasing tendency with the highest value at mature period. In addition to the density treatment B6 (6170 plants ha^–1), SS activity showed a tendency of rising-decreasing-hiding in T601, and no obvious changing hale in XT-2. Except for density treatment B2 (11 110 plants ha^–1), B4 (7929 plants ha^–1), SPS activity showed a tendency of rising-reducing-rising in XT-2, and no obvious rule in T601.For XT-2, the optimal density was 9250 plants ha^–1, the total sugar content was 14.2% (on a fresh matter basis), for T601 the optimal density was 11 110 plants ha^–1, the total sugar content was 14.31% (on a fresh matter basis). The latter is the best choice for total sugar accumulation. Activity of SS is decline, SPS activity Declined and increased. SPS activity in the full ripening stage are favorable to sugar accumulation. In this care, it is the best time for harvest.