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

文献类型： 外文期刊

作者： Wang, Tianyu 2 ; Ma, Xinglin 2 ; Li, Yu 2 ; Bai, Dapeng 3 ; Liu, Cheng 4 ; Liu, Zhizhai 2 ; Tan, Xianjie 2 ; Shi, Yunsu 2 ;

作者机构： 1.Pioneer HiBred Int Inc, Johnston, IA 50131 USA

2.Chinese Acad Agr Sci, Inst Crop Sci, Beijing 100081, Peoples R China

3.Pioneer Tieling Seeds Res Co, Shenyang 110004, Peoples R China

4.Xinjiang Acad Agr Sci, Inst Cereal Crops, Urumqi 830091, Peoples R China

5.Pioneer HiBred Int Inc, Princeton, IL 61356 USA

关键词： genetic gain;crop yield;plant morphology

期刊名称：CROP SCIENCE （ 影响因子：2.319； 五年影响因子：2.631 ）

ISSN：

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收录情况： SCI

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

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