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Article
2022
Do lower nitrogen fertilization levels require breeding of different types of cultivars in triticale?
Do lower nitrogen fertilization levels require breeding of different types of cultivars in triticale?
Abstract (English)
Breeding high-yielding, nitrogen-efficient crops is of utmost importance to achieve greater agricultural sustainability. The aim of this study was to evaluate nitrogen use efficiency (NUE) of triticale, investigate long-term genetic trends and the genetic architecture, and develop strategies for NUE improvement by breeding. For this, we evaluated 450 different triticale genotypes under four nitrogen fertilization levels in multi-environment field trials for grain yield, protein content, starch content and derived indices. Analysis of temporal trends revealed that modern cultivars are better in exploiting the available nitrogen. Genome-wide association mapping revealed a complex genetic architecture with many small-effect QTL and a high level of pleiotropy for NUE-related traits, in line with phenotypic correlations. Furthermore, the effect of some QTL was dependent on the nitrogen fertilization level. High correlations of each trait between N levels and the rather low genotype-by-N-level interaction variance showed that generally the same genotypes perform well over different N levels. Nevertheless, the best performing genotype was always a different one. Thus, selection in early generations can be done under high nitrogen fertilizer conditions as these provide a stronger differentiation, but the final selection in later generations should be conducted with a nitrogen fertilization as in the target environment.
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Theoretical and applied genetics, 135 (2022), 993–1009.
https://doi.org/10.1007/s00122-021-04012-9.
ISSN: 1432-2242
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English
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630 Agriculture
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Sustainable Development Goals
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@article{Neuweiler2021,
url = {https://hohpublica.uni-hohenheim.de/handle/123456789/16492},
doi = {10.1007/s00122-021-04012-9},
author = {Neuweiler, Jan E. and Trini, Johannes and Maurer, Hans Peter et al.},
title = {Do lower nitrogen fertilization levels require breeding of different types of cultivars in triticale?},
journal = {Theoretical and applied genetics},
year = {2022},
volume = {135},
}