Harvest index has increased over the last 50 years of maize breeding

Alejo Ruiz, Slobodan Trifunovic, Douglas M. Eudy,Cintia S. Sciarresi,Mitchell Baum,Gerasimos J.N. Danalatos,Elvis F. Elli, Georgios Kalogeropoulos, Kyle King,Caio dos Santos,August Thies,Lia Olmedo Pico,Michael J. Castellano,Patrick S. Schnable,Christopher Topp, Michael Graham,Kendall R. Lamkey,Tony J. Vyn,Sotirios V. Archontoulis

Field Crops Research（2023）

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摘要

•We quantified harvest index (HI) genetic gain in maize hybrids.•The HI relative genetic gain was 0.26% year−1 since 1964.•The HI increase is attributed to breeding, not to management.•Plant density and N-fertilizer treatments did not affect the HI genetic gain.•We estimated that the increase in HI accounts for 15% of the historical maize yield increase in the US Corn Belt.

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关键词

Genetic gain, Maize biomass, Plant breeding, Soil carbon, Stover

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