The relation between yield and protein in cereal grain

Journal of the Science of Food and Agriculture - Tập 67 Số 3 - Trang 309-315 - 1995
N. W. Simmonds1
1IERM, School of Agriculture, West Mains Road, Edinburgh EH9 3JG, UK

Tóm tắt

Abstract

An analysis of published data on genetic relations between dry grain yields (y, t ha−1) and protein content [p, protein as a fraction (g g−1) of dry grain] of cereals is presented. In all, 106 usable regressions of y on p across geneotypes were assembled. The long‐recognised negative relation between yield and protein concentration was fully substantiated. There is a strong positive relation between grain yield and protein yield. The linear regression coefficient of yield on protein concentration is related to yield, with slope about −15. This relation holds approximately over all cereals. The data can be used to estimate a characteristic parameter described by C = dy/d(yp) = ∼ 15–25 at the mean of each experiment. The relationship is surprisingly consistent but no simple physiological interpretation is available. In discussion, the high C, the impact of strong negative regressions of y on p for breeding strategies, the fact that protein yield increases with gross grain yield but at falling p and certain socio‐economic consequences are emphasized. An acute need for orderly reporting of experimental data is also emphasised; the existing literature is chaotic as to units, moisture contents and conversion factors.

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Journal of the Science of Food and Agriculture

Tập 67 Số 3

309-315

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