Selection And Analysis On The Stability Of New Maize Hybrid Shaandan No.606 And 609

For the Northwestern region drought, the soil infertile ecological condition, with the corn high production highly as the goal,the maize germplasm have been amplified,improved and utilized in orde to enhance the ability of vareity to adapt to the unfavorable environment,such as: high density, drought, poor soil resistance, disease resistance and so on.the high–quality inbred lines were screened from the X population of the the maize Research Center of Beijing Academy of Agricultural Sciences in 2006, according the seed rate and productivity of the plant in the three desities (60000,90000and 1200000plant·/hm-2) through multi-environment testing and identification.The maize results were summarized as following:1. The main character of the maize population were significantly optimized through 4 generations of directional selection in two years of 2006-2007, the plant height of the maize population average drops 14.75% ,and the ear position height fell by 15.32%; but plant productivity increase 5.76% and the seed rate enhancement 0.91%,while male and female flowering interval and the barreness rate were obvious with an average reduction of 34.38% and 88.51%.2. The inbred line L91114, L91162, L91227, L91242 and L91266 were screened in the fourth selection with productivity and plant seed rate, according to agronomic traits and comprehensive resistance;they were with higher general combining ability (GCA), the identification of a higher rate of positive effects of GCA were 80%, 90% and 70% in the three desities (60000,90000 and 1200000/ plant·hm-2). By general combining ability( GCA )and specific combining ability (SCA) analysis,the excellent line L91114, L91162, L91227, L91242 and L91266 were identified the positive effect on the performance of plant desity;while the outstanding combination were screened at the same time,there weret L91162×Dan 598, L91242×Dan 598, L91227×Chang 7-2, L91266×Chang 7-2 and so on.3. The test-crossing in Hainan in 2007 and the joint identification in 2008 results showed that Shaandan No. 606 (L91162×Dan 598) and Shaandan No. 609 (L91227×Chang 7-2) were combined with good performance of maize yield, stability and adaptability; 9.1-10.74% increase comparing with the control.4. The stability of the new maize hybrid Shaandan No. 606 and 609 were analyzed with average yield, yield percentage, coefficient of variation and high temperature coefficient evaluation methods, basing on the data of Shaanxi Province maize regional trials in 2009-2010. these results showed that the average yield of hybrid Shaandan No.606 were 11001.0kg/hm-2,and increase of 10.2% comparing with the control Yuyu 22 (9631.95 kg / hm-2 with the trial yield of the 21 points in 2 years,andyield coefficient of variation were 24.6,the high stability coefficient were75.5%. while Shaandan No.609 were 9285.0kg/hm-2,and increase of 6.39% comparing with the control Zhengdan 958 (9631.95 kg / hm-2 with the trial yield of the 17 points in 2 years,and yield coefficient of variation were 17.2,the high stability coefficient were 80.1%. All showed that the new maize hybrid Shaandan No. 606 and 609 have prominent with high yield, good stability, strong resistance to adapt to scope broad characteristic.