1Introduction of resistant gene and production of high yielding materials resistant to soybean cyst nematode for summer soybeanHA Xin-xian, JIANG Hui-lan, GAO Jian-wei, WU Jian-jun4-72Production of new wheat germplasm using Taigu nuclear sterile geneCHEN Xiang-zhi, ZHANG Qi-lu, ZHANG Lian-xiao8-103Practices and thoughts on breeding of good maize inbreds and high heterosis hybrids using exogenous germplasmYE Jin-cai11-134Studies on less seeding - rate cultivation technique for transgenic hybrid cotton14-175Biological characterization of Newcastle disease virus S1 strain isolated from laying hens in ShandongWANG Li-li, MU Jian-qing, AI Wu, HUANG Bing, ZHANG Xiu-mei, SONG Min-xun, LI Feng, WANG Chun-ling18-19