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 analyzed.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 jointing 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,phosphorus and amino acids.%为明确4个高丹草新品系SLCN-11、SLCN-12、SLCN-13、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130～138 d,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％,PMC M I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100 cm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.
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