ArticlePlant cell reports2026
Development and application of KASP molecular marker for accelerated breeding of low-acid Cerasus humilis cultivars.
Article in Plant cell reports, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
key messageThe KASP13 marker is located on chromosome 1 of Cerasus humilis. The AA genotype is associated with high acidity, whereas the AC genotype is associated with low acidity, with a prediction accuracy of 86.84%. This marker can be used to develop low-acid C. humilis cultivars. Common commercial cultivars of Cerasus humilis generally have high fruit acidity. Our research group previously constructed a hybrid of the 'Jinou 1' (high acidity) and 'DS-1' (low acidity) cultivars of C. humilis. Here, we conducted quantitative trait locus (QTL) mapping of fruit acidity using 208 F1 progeny of this cross to construct a high-density genetic map. We then used these findings to develop kompetitive allele-specific PCR (KASP) molecular markers. Results collected over 2 consecutive years showed that the hybrid population of 'Jinou 1' × 'DS-1' exhibited a continuous normal distribution of titratable acid content in their fruits, indicating that acidity level was a typical quantitative trait controlled by multiple genes. Stemming from this finding, interval mapping identified 16 QTLs associated with fruit acidity. The phenotypic variation contribution rates ranged from 8.6 to 25%. We then used KASP to develop molecular markers for organic acids, all of which were located to chromosome 1, with genotypes AA and AC representing the high- and low-acid types, respectively. KASP markers were used for genotype validation in 41 different acidic C. humilis varieties (lines) and 3 hybrid populations. This study provides a solid foundation for accelerated, efficient molecular-marker-assisted breeding of C. humilis cultivars which produce low-acidity fruits.
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