Abstract:

The aim is to provide a scientific basis for the improvement of excellent maize inbred lines, the breeding of hybrids and the innovation of maize germplasm. The base material was constructed by backcrossing the domestic inbred line ‘Zi340’ with the excellent single (S1) of the foreign hybrid ‘X1132X’, and the excellent multi-resistant maize inbred line‘Xun696’ was bred by selfing after 7 generations using the superior line aggregation and high and large strict selection methods. ‘Xun696’ had multi-disease resistance to corn rough dwarf，stem rot, southern corn rust，corn northern leaf blight and corn southern leaf blight. It had fruiting spikes cylindrical, uniformity of size and kernel row number 18-20. It also had compact plant tape，strong combining ability, high seed production yield and wide range of adaptability. Two corn hybrids including ‘Yongyou1573’ and ‘Yongyou1583’ from ‘Xun696’ inbred line combination were approved by the National or Provincial Crops Variety Approval Committee. These two new varieties have been popularized and applied on a large scale in Huanghuaihai summer maize region and middle and late maturity zone of Inner Mongolia Autonomous Region, and have achieved better social and economic benefits.

Key words: maize, inbred line, ‘Xun696’, superior line aggregation