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Tuber quality is the subject of great interest among the processing industry and consumers worldwide. Being a polygenic trait, its enhancement requires a systematic understanding of their genetic complexity. Molecular genetics offered valuable solutions to the challenging endeavours of slow genetic gains in conventional potato breeding. With the advent of linkage maps, molecular markers and availability of next‐generation sequencing (NGS) platforms, the plant breeding programmes worldwide have achieved faster genetic gain due to marker‐assisted selection (MAS). Linkage mapping detects QTLs in biparental population; alternatively, genomic and phenotypic differences can be identified by extensive genotyping and phenotyping of a germplasm panel depicting natural biological diversity to reveal QTLs, in other words, marker‐trait associations. Due to advancements in the fields of genome sequencing and bioinformatics, researchers have preferred to use the genome‐wide association mapping (GWAS) method for detecting QTLs due to its higher resolution. In potato, GWAS identified causative allele(s)/loci and provides reliable platform for the development of diagnostic SNP markers by employing Infinium SolCAP SNP array. Later, KASP validation markers can be developed to be used as selection markers in order to bred improved cultivars. The current review focuses on recently used approaches for genetic analyses (linkage mapping or association mapping) regarding potato tuber quality traits, provides comprehensive knowledge about breeding, genetic gain, basic genetic and statistical GWAS concepts and subsequently highlights the genetic discoveries using GWAS and KASP markers.

Microbial biomass N was measured in 18 agricultural soils collected from Punjab, Pakistan using a chloroform fumigation extraction method (CFEM), a chloroform extraction method (CEM), and a chloroform fumigation-incubation method (CFIM) using anaerobic incubation. In CFEM, the soil samples were exposed to chlorgform vapour for 24 h followed by estimation of the K2SO4-extractable N whereas in CEM, soil samples were directly extracted with K2SO4 containing 10% chloroform. In the CFIM, fumigated and unfumigated samples were incubated for 15 days under anaerobic conditions and the NHa-N accumulated in the soils was used to calculate biomass N.The biomass N determined by CEM accounted for 2.8 to 13.8% of the total soil N; the average value for all soils was 6.9%, an almost similar variation (2.6 to 14.8%) was observed for the CFEM. The biomass N determined by the two methods was highly correlated (r = 0.89, P < 0.01). Biomass N estimated by CFIM in soils incubated under anaerobic conditions accounted for 6.1 to 13.6% of the total soil N but showed no significant correlation with biomass N determined by either CFEM or CEM.