中文摘要：

为明确4个高丹草新品系SLCN-11、SLCN-12、SLCN13、SLCN-14的生育特性、生产性能、营养价值和细胞遗传学特征，对其生长速度、育性、光合性能、鲜草及种子产量、氢氰酸含量、营养成分等主要农艺特性及染色体构型进行了分析。4个新品系生长速度快，植株高大，分蘖能力强，生育期130-138d，穗型呈双亲中间型，花粉可育率高达96％以上，自然结实率为72．11％-73．34％，PMCMI染色体配对行为规则（2n=2x=20-10Ⅱ）。新品系的光合能力均较强，鲜草产量和种子产量均较高，以SLCN-11的增幅最大。新品系的氢氰酸含量均很低，株高约100crn时鲜草氢氰酸含量仅为5．80-10．43mg／kg，青刈饲喂安全。新品系的茎叶比均较小，营养价值高，拔节期粗蛋白质含量为14．67％-16．31％，粗纤维含量为24．31％-24．72％，并富含粗脂肪、无氮浸出物、钙、磷及各种氨基酸等营养成分。

英文摘要：

In order to investigate the growth characteristics, production performance, nutritional value and cy- togenetic characteristics of the four new strains of sorghum--sudangrass SLCN-11, SLCN-12, SLCN-13, SL- CN-14, the main agronomic characteristics and chromosome configuration, such as the growth rate, fertility, photosynthetic performance, fresh and seed yields, hydrocyanic acid content, nutrients and so on, were ana- lyzed. The four new strains grew fast and were tall, tillering ability was strong, the growth period was 130-- 138 d, the ear type was in middle of their parents, pollen fertility rate was above 96~, seed setting rate was 72. 11~--73.34~, The chromosome pairing behavior at PMC M I was regular （2n=2x=20=10 II ）. The four new strains had stronger photosynthetic capacity. Their fresh and seed yields were high. The fresh and seed yields of strain SLCN-11 were the highest. The hydrocyanic acid content of the four new strains were low, the hydrocyanic acid content in fresh sorghum--sudangrass was only 5.80--10.43 mg/kg when the plant height was about 100 cm, which was safe for feeding animals. The ratio of stem to leave was low and the nutritional value was high. At the j ointing stage, the crude protein content of four new strains was 14.67%- 16.31%, the crude fiber content was 24.31%- 24.72%, and was rich in crude fat, nitrogen free extract, calcium, phos- phorus and amino acids.