Changes in Yield and Yield Components of Single‐Cross Maize Hybrids Released in China between 1964 and 2001

• DOI: 10.2135/cropsci2010.06.0383
• Publication Date: 2011-02-18T17:35:08Z
• Authors: Tianyu Wang; Xinglin Ma; Yu Li; Dapeng Bai; Cheng Liu; Zhizhai Liu; Xianjie Tan; Yunsu Shi; Yanchun Song; Mario Carlone; David Bubeck; Hans Bhardwaj; Elizabeth Jones; Kevin Wright; Stephen Smith
• Keywords: Germ plasm; Genetic gain

ABSTRACT The objectives of this study were to (i) measure genetic gain using a set maize ( Zea mays L.) single‐cross hybrids that widely used in Chinese production from 1964 2001, (ii) determine if there changes morphological characteristics, and (iii) examine the germplasm backgrounds these hybrids. Yield trials conducted for 3 yr, split‐plot design. Each hybrid was planted at three different densities four locations, two locations each representing summer spring corn areas. Mean rates 52 kg ha −1 yr when measured 69 60 across all locations. There no significant effect planting density on gain. Genetic has been largely contributed by increased yield per plant strategy reflected ear morphology. Analyses pedigree showed continuing dependence U.S. backgrounds, notably C103, Oh43, Mo17, Iowa Stiff Stalk Synthetic (BSSS).