Journal
CROP SCIENCE
Volume 53, Issue 2, Pages 366-377Publisher
WILEY
DOI: 10.2135/cropsci2012.07.0439
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Funding
- Dow AgroSciences, Potash Corporation
- USDA National Institute of Food and Agriculture (NIFA award) [2010-85117-20607]
- Purdue Bilsland Dissertation Fellowship
- NIFA [580996, 2010-85117-20607] Funding Source: Federal RePORTER
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Understanding the sources of grain N uptake (Grain N) in maize (Zea mays L.) and especially the trade-off between reproductive-stage shoot N remobilization (Remobilized N) and reproductive-stage whole-plant N uptake (Reproductive N) is needed to help guide future improvements in yield and N use efficiency (NUE). Therefore, a literature review was performed to investigate the knowledge gap concerning changes over time in Grain N sources and on N partitioning to the grain and stover plant fractions at maturity. The synthesis-analysis was based on 100 reports, which were divided into two time intervals: (i) research conducted from 1940 to 1990-Old Era-and (ii) research conducted from 1991 to 2011-New Era. The most remarkable results were (i) Grain N concentration was the main parameter that has changed over time, (ii) Reproductive N contributed proportionally more to Grain N for the New Era while Reproductive N and Remobilized N contributed equally to Grain N for the Old Era, (iii) Remobilized N was primarily associated with vegetative-stage whole-plant N uptake (Vegetative N), which was constant across eras, although the proportion of the Remobilized N itself seems to be driven by the ear demand, (iv) complex plant regulation processes (source: sink) appeared to influence Reproductive N, and (v) stover N concentration gains mirrored the grain N concentration as the plant N uptake increased at maturity in both eras. This new appreciation for the changes over time may assist directed selection for yield and NUE improvements.
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