遗传侵蚀
遗传多样性
生物
瓶颈
农业
作物多样性
现代化理论
多样性(政治)
腐蚀
物种均匀度
农林复合经营
物种丰富度
作物
栽培
农学
生物技术
生态学
人口
计算机科学
社会学
人口学
政治学
古生物学
人类学
嵌入式系统
法学
作者
Mark van de Wouw,C. Kik,T.J.L. van Hintum,R. van Treuren,Bert Visser
出处
期刊:Plant Genetic Resources
[Cambridge University Press]
日期:2009-10-19
卷期号:8 (1): 1-15
被引量:306
标识
DOI:10.1017/s1479262109990062
摘要
The loss of variation in crops due to the modernization of agriculture has been described as genetic erosion. The current paper discusses the different views that exist on the concept of genetic erosion in crops. Genetic erosion of cultivated diversity is reflected in a modernization bottleneck in the diversity levels that occurred during the history of the crop. Two stages in this bottleneck are recognized: the initial replacement of landraces by modern cultivars; and further trends in diversity as a consequence of modern breeding practices. Genetic erosion may occur at three levels of integration: crop, variety and allele. The different approaches in the recent literature to measure genetic erosion in crops are reviewed. Genetic erosion as reflected in a reduction of allelic evenness and richness appears to be the most useful definition, but has to be viewed in conjunction with events at variety level. According to the reviewed literature, the most likely scenario of diversity trends during modernization is the following: a reduction in diversity due to the replacement of landraces by modern cultivars, but no further reduction after this replacement has been completed.
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