Breeding and Application of the Elite Inbred Line SCML0849 in a New Round of Maize Breeding in Southwest China
At the end of the 20th century,the Reid germplasm population was synthesized for maize breeding based on the theory of ecological breeding.Previous experience has concluded that elite inbred lines from the germ-plasm selected in the temperate zone are the best for Southwest China.The resulting population satisfied the urgent requirements for the development of maize varieties and industries nowadays and future in Sichuan and Southwest China.During the process of synthesis,a technology system was innovated by combining traditional breeding meth-ods with modern molecular tools,and growing the elite parental lines in specific ecological regions for target selec-tion.For improving breeding efficiency,the system has the following steps:determination of general combination ability(GCA)at early stage,high-density planting determination for a target region,field selection back and forth in North and South China for passivation to photoperiod,and one-vote discard for reginal disease-resistance and stress-tolerance.Using this system,the inbred line SCML0849 has been developed with high GCA,high resistance to diseases and abiotic stresses,high yield,and high nutrient utilization in Southwest China.A number of excellent hybrids have been bred using SCML0849 as a parent,such as Chuandan 99 with stably high yield,high efficiency of fertilizer utilization,high resistance to diseases,and high tolerance to multiple stresses,etc.in Southwest China.As a result,Chuandan 99 has been grown over a large area of Southwest China.
MaizeInbred lineNorth-south shuttle breedingDirectional and efficient breedingSCML0849Chuandan 99
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