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

AbstractAn 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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