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  • In Vitro Methods for Conservation of Plant Genetic Resources
    J.H. Dodds
    However, the transition from primitive to ’advanced’ cultivars has had the effect of narrowing the genetic base. This has happened in two distinct ways: (1) selection for relative uniformity, resulting in ’pure’ lines, multi­ lines, single or double hybrids, etc. ; and (2) selection for closely defined objectives. Both of these processes have resulted...
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