Utiliazation of Tropic Germplasm in North Early-Matured Spring Maize Improvement

Nine materials were selected including Dian 11 and its introduced lines with different tropic germplasm,different tropic germplasm proportion and the sister lines with 25 percentage tropic germplasm,Taking Zaodahuang and Hongyumi for test varieties,the yield,comparative predominance and agronomy traits of cross combinations of lines formed by introducing tropic germplasm into Dian 11 are tested through two-factor test design,agronomy traits of inbred lines were also tested.The results indicate that: same inbred line showed differently among different test varieties.To introduce Evt5 into Dian11 inbred lines could get good results if adopting the modeDian 11×Zaodahuang,to introduce Suwan1 into Dian11 inbred lines could get high hybrid yield if adopting the modeDian 11×Hongyumi,of the Suwan1 proportion in Dian11 from 12.5% to 75%,12.5%~50% was moderate,25% showed the best general results.There were significant differences among three sister lines(25% Suwan1) in their hybrids' yield, agronomy traits and main characteristics of inbred lines,It was benefit to contain some numbers of sister lines in inbred lines when introducing tropic germplasm with broad genetic background.