英文文献：Evidence for increasing concentration in plant breeding industries in the United States and the European Union
英文文献作者：Nolan, Elizabeth,Santos, Paulo
英文文献摘要：
There is evidence of an increase in market concentration and in the importance of private plant breeding in the seed industry following the widespread adoption of Intellectual Property Rights regimes for the industry in the developed world. We use data from the US Patent and Trademark Office, US Plant Variety Protection Office and various European Plant Variety Protection databases to estimate the extent of these changes in the seed corn industry.