| The Impact of US and CGIAR Germplasm on Maize Production in China |
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| 作者姓名： | LI Hai-ming HU Rui-fa ZHANG Shi-huang |
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| 作者单位： | [1]Zhanjiang Normal University, Zhanjiang 524048, P.R.China [2]Center for Chinese Agricultural Policy, the Chinese Academy of Sciences, Beijing 100101, China [3]Institute of Geographical Sciences and Natural Resources Research, the Chinese Academy of Sciences, Beijing 100101, P.R.China [4]Graduate School, the Chinese Academy of Sciences, Beijing 100094, P.R.China [5]Institute of Crop Sciences, Chinese Academy of Agricultural Sciences, Beijing 100081, P.R.China |
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| 摘 要： | Wide adoption of a few kinds of homogeneous germplasm would reduce crop genetic diversity, increase crop vulnerability to stresses, and reduce the stability of crop production. The introduction and utilization of foreign germplasm is a sustainable solution for broadening the genetic diversity and promoting periodical replacement of varieties. The genetic contribution and economic impact of foreign germplasm, particularly those of US and CGIAR （Consultative Group on International Agricultural Research, referred to as the CG system） materials, on China＇s maize production are evaluated on the basis of an analysis of variety pedigree information from 20 major maize-producing provinces in China from 1982 to 1997. The results indicated that the contribution of US and CG germplasm to Chinese maize production continues to increase, particularly CG germplasm, which has shown a rapid increasing trend since the 1990s. If the genetic contribution of US germplasm is increased by 1%, maize yield will gain by 0.2% （0.01 t ha^-1）. If contribution of CG germplasm, which has greater production potential, is increased by 1%, maize yield will gain by 0.025 t ha^-1. A policy should be implicated by the government in this direction to encourage breeders to focus more on the use and improvement of CG germplasm. The US germplasm has been utilized extensively in China so that it can offer germplasm resources for maize breeding efforts.
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| 关 键 词： | 种质资源 遗传多样性 玉米 US CG |
The Impact of US and CGIAR Germplasm on Maize Production in China |
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| LI Hai-ming HU Rui-fa ZHANG Shi-huang.The Impact of US and CGIAR Germplasm on Maize Production in China[J].Agricultural Sciences in China,2006,5(8):563-571. |
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| Authors: | LI Hai-ming HU Rui-fa ZHANG Shi-huang |
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| Abstract: | Wide adoption of a few kinds of homogeneous germplasm would reduce crop genetic diversity, increase crop vulnerability to stresses, and reduce the stability of crop production. The introduction and utilization of foreign germplasm is a sustainable solution for broadening the genetic diversity and promoting periodical replacement of varieties. The genetic contribution and economic impact of foreign germplasm, particularly those of US and CGIAR (Consultative Group on International Agricultural Research, referred to as the CG system) materials, on China's maize production are evaluated on the basis of an analysis of variety pedigree information from 20 major maize-producing provinces in China from 1982 to 1997. The results indicated that the contribution of US and CG germplasm to Chinese maize production continues to increase, particularly CG germplasm, which has shown a rapid increasing trend since the 1990s. If the genetic contribution of US germplasm is increased by 1%, maize yield will gain by 0.2% (0.01 t ha−1). If contribution of CG germplasm, which has greater production potential, is increased by 1%, maize yield will gain by 0.025 t ha−1. A policy should be implicated by the government in this direction to encourage breeders to focus more on the use and improvement of CG germplasm. The US germplasm has been utilized extensively in China so that it can offer germplasm resources for maize breeding efforts. |
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| Keywords: | germplasm genetic diversity maize US CG |
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