甜高粱与普通高粱的物质积累分配变化比较

Comparation of matter accumulation and distribution between sweet sorghum and grain sorghum

以3个普通高粱和3个甜高粱品种为材料,研究2种类型高粱茎秆含水率、干物质积累以及糖锤度在七叶期、孕穗期、抽穗期、灌浆期和成熟期5个生育期的变化。结果表明,2种类型的高粱茎秆含水率变化总体趋势相似,除孕穗期外,每个时期甜高粱茎秆含水率都高于普通高粱5%以上。甜高粱与普通高粱在干物质积累分配上呈现2种不同的规律,甜高粱茎秆干重比率大于普通高粱,是拥有籽粒与茎秆2个库的"双库型"作物。甜高粱茎秆糖锤度从七叶期到孕穗期均缓慢上升,孕穗期到抽穗期上升最快,抽穗期到灌浆期继续上升,随后到成熟期出现差别。根据试验结果,从籽粒产量和总糖含量综合考虑,探讨甜高粱的最佳收获时期。

In this study, the moisture content of stem, dry matter accumulation and stalk brix degree were investiga- ted at 5 different growth stages for 3 sweet sorghum and 3 grain sorghum genotypes, respectively. The results showed that moisture content of sweet sorghum was higher than grain sorghum by over 5% throughout the growth period of sorghum except at the booting stage. Significant differences were discovered between sweet and grain sorghum in dry matter accumulation. The dry weight ratio of sweet sorghum stem was greater than that of grain sorghum, which was evidenced that double sink （ grain and stalk） existed in sweet sorghum. The levels of stalk brix degree of sweet sorghum increased slowly from seven leaf stage to the booting stage, sharply from booting stage to heading stage, steadily from heading stage to filling stage and showed differences from filling stage to maturity stage. Taken the consideration for both grain and sugar yield, the most suitable harvesting strategy was suggested for sweet sorghum.