Stability, adaptability and adaptation

Allied to the phenomena of genotype—environment interactions, discussed in the previous chapter, are the topics of stability, adaptability and adaptation, topics which arouse considerable interest among plant breeders. Indeed, not only do they excite interest, they often cause confusion because terms such as phenotypic stability, yield stability, adaptability and adaptation are frequently used interchangeably, to the extent that (1957) was moved to say that ‘the word adaptation has a great adaptability’. Before entering into the details of the statistical procedures required to estimate them, we will describe some of the basic concepts which have been proposed to understand the reaction of genotypes or populations to changing environments.

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