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Influence of the Semi-dwarf Growth Type on Nitrogen Use Efficiency in Winter Oilseed Rape

dc.contributor.authorMiersch, Sebastian
dc.contributor.authorGertz, Andreas
dc.contributor.authorBreuer, Frank
dc.contributor.authorSchierholt, Antje
dc.contributor.authorBecker, Heiko C.
dc.description.abstractA higher nitrogen (N) use efficiency is an important breeding goal in crops such as oilseed rape (Brassica napus L.) that are considered less N efficient compared with crops like wheat (Triticum aestivum L.) or barley (Hordeum vulgare L.). Changes in the plant ideotype, such as reduced plant height of semi-dwarf hybrids, are said to result in an increased harvest index and N harvest index. This could lead to a higher N efficiency, especially when N availability is restricted. A double haploid population was developed that was segregating for the bzh dwarf locus, with 54 dwarf and 54 normal-type lines. By crossing with a normal-type tester, 108 testcrosses were produced with 54 hybrids each of semi-dwarf and normal types. They were evaluated for seed yield, straw yield, and N content under zero and high N fertilization in six and four trials, respectively, in the years 2010 to 2013. Quantitative trait loci were estimated for N-related traits across environments. Semi-dwarf hybrids showed a significantly higher N harvest index, N uptake efficiency, N utilization efficiency, and N use efficiency compared with normal-type hybrids at N deficiency. The relative contribution of N uptake efficiency to the total genetic variation in N use efficiency was higher in semi-dwarf genotypes than in normal-type hybrids at both N levels. Quantitative trait loci of five and two N-related traits under zero and high N fertilization, respectively, cosegregated with the bzh-locus on linkage group A06, indicating that the semi-dwarf growth type has a high influence on N efficiency. We conclude that semi-dwarf hybrids are better adapted to N deficiency.
dc.relationinfo:eu-repo/grantAgreement/EC/FP7/222645/EU/Improving nutrient efficiency in major European food, feed and biofuel crops to reduce the negative environmental impact of crop production/NUE-CROPS
dc.subjectSemi-dwarf; Growth; Nitrogen; Winter Oilseed Rape
dc.titleInfluence of the Semi-dwarf Growth Type on Nitrogen Use Efficiency in Winter Oilseed Rape
dc.bibliographicCitation.journalCrop Science

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