Population breeding

The maize of the subsistence farmers in tropical Africa consisted of open-pollinated landraces, or agro-ecotypes. They were one of the few categories of agricultural plant population that could respond to selection pressures during the cultivation process. This is a genetically flexible crop (see 1.15). Its response was identical to an imposed recurrent mass selection, and it follows that we should use recurrent mass selection, otherwise known as population breeding, when breeding for horizontal resistance.

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