我国常用玉米自交系秸秆品质性状及其相关分析

利用近红外反射光谱法对我国91份常用普通玉米自交系和11份高油自交系秸秆的体外干物质消化率（IVDMD）、粗蛋白（CP）、粗脂肪（EE）、可溶性糖（WSC）、酸性洗涤纤维（ADF）、酸性木质素（ADL）、中性洗涤纤维（NDF）7个品质性状进行了分析评价，以探讨秸秆品质性状间的关系以及影响秸秆品质的主要成分。结果表明，各品质性状变异较大，各性状自交系间差异均达极显著水平，IVDMD及其相关品质的含量近似正态分布。不同品质性状变异程度不同，其中WSC含量变异最大，变异系数达33.15%。IVDMD与NDF、ADF、ADL呈极显著负相关，与WSC、EE含量呈极显著正相关，与CP含量显著正相关。影响秸秆品质的性状依次是IVDMD、ADF、NDF、WSC、ADL、CP和EE含量。根据青贮玉米育种的要求，筛选出5份IVDMD和WSC含量高、NDF、ADF含量低的自交系。

Stalk Quality Traits and Their Correlations of Maize Inbred Lines in China

Maize stalk is the main resource for ruminant feed,which is above 50% of total plant.In order to provide materials and exploit them rationally in the process of high quality silage maize breeding,102 domestic and foreign inbred lines,including 91 normal oil corn(NOC) and 11 high oil corn(HOC) inbred lines were evaluated on seven stalk quality traits such as in vitro dry matter digestibility(IVDMD),crude protein(CP),ether extract(EE),the water soluble carbohydrate(WSC),acid detergent fiber(ADF),acid detergent lignin(ADL),and neutral detergent fiber(NDF).The technique of near infrared diffuse reflectance spectroscopy(NIDRS) were used to determine these values.The results showed that every quality trait had highly significant variation,the coefficient of variation(CV) of WSC was the highest(33.15%).IVDMD and other quality parameters were almost in normal distribution respectively.The correlation analysis among quality traits of inbred lines showed that IVDMD had a significant negative correlation with NDF,ADF,and ADL at P<0.01,but a significant positive correlation with WSC,EE,and CP at P<0.01 or P<0.05.The order of the traits influencing stalk quality from large to small was IVDMD,ADF,NDF,WSC,ADL,CP,and EE.Five elite inbred lines with high IVDMD and WSC and low ADF and NDF were selected to be further used for breeding programs.