Association Mapping of Physiological and Morphological Traits Related to Crop Development under Contrasting Nitrogen Inputs in a Diverse Set of Potato Cultivars

Ample nitrogen (N) is required for potato production, but its use efficiency is low. N supply strongly interacts with maturity type of the cultivar grown. We assessed whether variation among 189 cultivars grown with 75 or 185 kg available N/ha in 2 years would allow detecting quantitative trait loci...

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Bibliographic Details
Published in:Plants (Basel) 2021-08, Vol.10 (8), p.1727
Main Authors: Ospina Nieto, Cesar A., Lammerts van Bueren, Edith T., Allefs, Sjefke, Vos, Peter G., van der Linden, Gerard, Maliepaard, Chris A., Struik, Paul C.
Format: Article
Language:English
Subjects:
Agricultural production
canopy development
Chromosome 2
Chromosome 5
Chromosomes
Crop development
Cultivars
Efficiency
Gene mapping
Genome-wide association studies
genome-wide association study
Genomes
Growth models
Marker-assisted selection
Markers
Maturity
maturity type
Nitrogen
nitrogen use efficiency
Nucleotides
Physiology
Population
Potatoes
Quantitative trait loci
Radiation
Single-nucleotide polymorphism
Solanum tuberosum
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Summary:Ample nitrogen (N) is required for potato production, but its use efficiency is low. N supply strongly interacts with maturity type of the cultivar grown. We assessed whether variation among 189 cultivars grown with 75 or 185 kg available N/ha in 2 years would allow detecting quantitative trait loci (QTLs) for relevant traits. Using phenotypic data, we estimated various traits and carried out a genome-wide association study (GWAS) with kinship correction. Twenty-four traits and 10,747 markers based on single-nucleotide polymorphisms from a 20K Infinium array for 169 cultivars were combined in the analysis. N level affected most traits and their interrelations and influenced the detection of marker–trait associations; some were N-dependent, others were detected at both N levels. Ninety percent of the latter accumulated on a hotspot on Chromosome 5. Chromosomes 2 and 4 also contained regions with multiple associations. After correcting for maturity, the number of QTLs detected was much lower, especially of those common to both N levels; however, interestingly, the region on Chromosome 2 accumulated several QTLs. There is scope for marker-assisted selection for maturity, with the main purpose of improving characteristics within a narrow range of maturity types, in order to break the strong links between maturity type and traits like N use efficiency.
ISSN:2223-7747
2223-7747
DOI:10.3390/plants10081727