Based on the successful results of a maize genetics and hybrid breeding study carried out by local and foreign scientists, we suggest paying attention to GCA selection, making use of TTC (Triple Test Cross Design), and combining genetic study and population improvement with inbred and hybrid selection. This would help with making selections more accurate, shortening the period of developing inbred and hybrid, and speeding up maize breeding in southwest of China. Hybrids developed from Temperate Zone germplasms are not adaptable for the complicated and changeable circumstances in this mountainous area. According to the model of maize heterosis in China, a new model is raised for the comprehensive utilization of Torrid Zone germplasms with characteristics such as strong resistance, extensive adaptability, and great organism yield. Temperate Zone germplasms show characteristics such as great economic coefficient. In this model, inbreds of two kinds of germplasm are developed separately and the fine characteristics should be synthesized in a hybrid, not in an inbred to breed hybrids with great and stable yield and broad adaptability. The inbred selected in the southwest of China should be crossed with external inbred from foreign counties and north of China. The cooperation should be strengthened and inbreeds should be exchanged especially between south and north China. In this way, maize-breeding efficiency will increase greatly.

English

0501|AGRIS 0501|AL-Maize Program

Juan Carlos Mendieta

CIMMYT Publications Collection