Analysis On Stalk Fiber Quality Of Maize Hybrids And Their Parent Inbred Lines From Different Period In China

Maize (Zea mays L.) is an important crop in China. It is necessary and important for maize stalk quality improved to study on the variation trend of different period maize hybrids and inbred lines in China. The research had established the NIRS calibration models with 32 wide germplasm inbred lines and 20 widely utilized hybrids. Though the study of the variation trend of different stalk quality, such as ADF, ADL, CELLU, HCELLU and NDF for hybrids and the inbred lines in different growth stages and different planting density and different germplasm groups, we get the following conclusions:1. The mean content of ADF, ADL, CELLU, HCELLU and NDF were 30.741%,4.081%,27.096%, 22.857% and 54.236% in maize stalk, respectively, with the range of 46.334%-10.133%,6.169%-0.253, 42.780-6.291%,33.388-15.692% and 76.752-34.680%. These stalk fiber quality straits have significant difference between varieties, plant years, planting densities and growth stages. Except ADL, all of other stalk traits showed significant positive correlationship between each other. Especialy, there was the highest correlation of 0.95 between ADF and NDF.2. With the developing of growth stages, the fiber components in maize stalk were changed. All the teased traits had the highest content at tasseling and shedding stage in both inbred lines and hybred The planting density showed complex effects on the stalk fiber components. The stalk fiber quality traits of hybrids have thesame variation trend with inbred lines that reach a peak in the late of 20th century.3.The results of different germplsm inbred lines shows that the inbred lines of Lancaster group and Tangsipingtou group have the higher components, while the inbred lines of Reid group and Lvdahonggu group have the low components. ADL have the different trend.4. Genetic analysis of stalk fiber quality traits showed that the main source of genetic variation was dominant effect and additive effect. The rate of dominant effect and additive effect for ADF, ADL, CELLU, HCELLU and NDF were 22.4% and 26.6%,22.5% and 22.7%,26.2% and 24.1%,19.9% and 17.4%,21.3% and 22.9%.The narrow sense heritability of each trait concentrate on 20%. The additive effect of inbred lines have the consistent performance. There were no significant mid-parent heterosis in different hybreds, while there were significant negative super-parent heterosis advantage.