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Chromosomal Locations and Interactions of Four Loci Associated With Seed Coat Color in Watermelon
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Chromosomal Locations and Interactions of Four Loci Associated With Seed Coat Color in Watermelon
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Chromosomal Locations and Interactions of Four Loci Associated With Seed Coat Color in Watermelon
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Journal Article
Chromosomal Locations and Interactions of Four Loci Associated With Seed Coat Color in Watermelon
2019
Overview
Different species of edible seed watermelons (
spp.) are cultivated in Asia and Africa for their colorful nutritious seeds. Consumer preference varies for watermelon seed coat color. Therefore, it is an important consideration for watermelon breeders. In 1940s, a genetic model of four genes,
,
,
and
, was proposed to elucidate the inheritance of seed coat color in watermelon. In this study, we developed three segregating F
populations: Sugar Baby (dotted black seed,
) × plant introduction (PI) 482379 (green seed,
), Charleston Gray (dotted black seed,
) × PI 189225 (red seed,
), and Charleston Gray (dotted black seed,
) × UGA147 (clump seed,
) to re-examine the four-gene model and to map the four genes. In the dotted black × green population, the dotted black seed coat color (
) is dominant to green seed coat color (
). In the dotted black × red population, the dominant dotted black seed coat color and the recessive red seed coat color segregate for the
and
genes, where the
gene is dominantly epistatic to the
gene. However, the inheritance of the
locus did not fit the four-gene model, thus we named it
. In the dotted black × clump population, the clump seed coat color and the dotted black seed coat color segregate for
and
, where
is recessively epistatic to
. The
,
,
, and
loci were mapped on chromosomes 3, 5, 6, and 8, respectively, using QTL-seq and genotyping-by-sequencing (GBS). Kompetitive Allele Specific PCR (KASP™) assays and SNP markers linked to the four loci were developed to facilitate maker-assisted selection (MAS) for watermelon seed coat color.
