Nitrogen use efficiency and relatedfunctional traits in wheat

TL;DRAbstract

Efficient use of nitrogen (N) is essential to decrease negative impacts of agriculture on the environment. This thesis evaluated the nitrogen use efficiency (NUE) of various wheat varieties, identified traits associated with high NUE and investigated the gene NAM-B1 in relation to some of these traits. To achieve this, a NUE concept was first developed. Six varieties each of winter and spring wheat (Triticum aestivum ssp. aestivum) at two levels of N fertilisation were studied in a one-year field experiment. A greenhouse experiment was performed with the same six spring wheat varieties at two levels of N fertilisation and three levels of drought. Forty-two varieties of spring wheat were grown in a climate chamber experiment. Furthermore, 527 wheat accessions were genotyped for their allele type of NAM-B1, a gene known to affect grain N concentration and senescence of wheat. The NUE concept developed here proved relevant in different experimental set-ups, as shown by the varieties

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