A Primary Analysis of the Effection of the Tropics(Subtropics) Germplasm Such as Tuxpeno and Suwan to Chinese Maize Breeding and Production

This article has analyzed the effects of the tropics,subtropics germplasm such as Tuxpeno,Suwan,Ac8238BN and South-west local varieties to Chinese maize breeding and production since 1970s of 20th.The results indicates that the elite maize populations such as Tuxpeno,Suwan,Ac8328BN,elite maize hybred lines such as S37,S11,S1611,QB39,Bie405,449,Da19,M9,Wu-151,Jiao51,5311 and elite maize hybrids such as Endan No.2,Huidan No.4,Yayu No.2,Guidan19,Xinghuangdan No.89-2,Jiaosandanjiao,Qiandan13 play a definite influence in Chinese maize breeding and production.During this period,the main heterosis patterns are Suwan Subgroup and Tuxpeno crossing with South-West local varieties selected lines or temperate zone germplasm improved local varities selected lines or typical temperate zone germplasm selected lines.In 21st century,in order to lay a foundation to raise Chinese maize breeding and production,how to continue to use previous heterosis patterns and how to utilize tropics,subtropics germplasm improved Chinese main group and to create new herosis patterns are worth to Chinese maize breeders such attention.