Читать книгу Principles of Plant Genetics and Breeding - George Acquaah - Страница 84

Marker technique is essentially selection by proxy. Selection is generally conducted by visually discriminating among variability, in the hope that the variation on hand is caused by differences in genotype and not by variation in the environment. Markers are phenotypes that are linked to genotypes (or precisely genes of interest). Markers are discussed in detail in Chapter 21. They are useful in facilitating the selection process and making it more efficient and cost effective. Molecular (DNA‐based) markers have superseded morphological markers in scale of use in plant breeding. Marker‐assisted selection (MAS) is used to facilitate plant breeding (see Chapter 24).