Articles written in Journal of Genetics
Volume 97 Issue 5 December 2018 pp 1075-1082 PERSPECTIVES
George Shull’s 1908 seminal article ‘The composition of a field of maize’ marked the ‘exploitation of heterosis in plant breeding, surely one of genetics’ greatest triumphs’. Hybrid corn became a ‘symbol of American agriculture’ and ‘the paradigm for all developments of F1 hybrid crop varieties and more generally breeding. But there is still no consensus on the definition of heterosis while its biological basis, causal factors and genetic mechanisms remain ‘unknown’, or at best ‘poorly understood’. It is thus logical to reverse the usual approach from the exploitation of a mysterious heterosis to the triumph of hybrid corn and focus on what breeders and geneticists do rather than on the theoretical reasons for their success. This factual approach produces surprising results: (i) hybrid corn extends the isolation technique of autogamous cereals to the allogamous maize; (ii) a ‘hybrid’ is an ordinary corn plantmade reproducible by the breeder and only the breeder. It is proprietary rather than ‘hybrid’; (iii) for all practical purposes, heterosis is irrelevant; (iv) Shull justified his ‘hybrid’ breeding method by the
Volume 100 All articles Published: 7 October 2021 Article ID 0072 PERSPECTIVES
The theoretical conclusion of Shull’s first article ‘The composition of a field of maize’––the breeder’s task is ‘the development and maintenance of that hybrid combination which possesses the greatest vigor’––has, for all practical matters, nothing to do with his breeding proposal to make ‘as many self-fertilization as practicable… Then all possible crosses are to be made among these different pure strains’, namely extending the small grain isolation method to maize. This conclusion should have been clear for an unprejudiced biologist as soon as Shull’s second article (January 1909), and was inevitable after his third one (December 1909). This article highlights Shull’s skillful rhetoric and semantic thatshaped the prejudice blinding biologists for more than a century and their neglect of Shull’s stated goals of crop uniformity and breeders’ property rights.
Volume 100, 2021
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