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Development of genome-wide PCR-based markers from insertion, deletion and single nucleotide polymorphisms for closely related Japanese rice cultivars and identification of QTLs for the appearance of cooked rice and polished rice.

Breeding Science 2016 December
Appearance of rice grain is an important property, affecting its acceptance by consumers. Moreover, appearance is a complex characteristic involving many components, including glossiness and whiteness. The genetic bases for the glossiness of cooked rice and the whiteness of polished rice (WPR) were determined using 133 recombinant inbred lines (RILs) derived from a cross between two closely related cultivars from Hokkaido, Joiku462, with high glossiness and whiteness, and Yukihikari, an ancestor of Joiku462 with low glossiness and whiteness. Analyses identified 167 genome-wide InDel markers, five cleaved amplified polymorphic sequences (CAPS) and eight derived CAPS markers differentiating the parental lines. The glossiness area (GLA) and glossiness strength (GLS) of cooked rice and WPR were determined for RILs in two locations, Pippu and Sapporo, Hokkaido. Four QTLs were detected. qGLA10 and qGLS9 were detected on chromosomes 10 and 9, respectively, with both being significant at both geographic locations. qWPR1 on chromosome 1 was significant at Pippu, and qWPR4 on chromosome 4 was significant at Sapporo. The Joiku462 alleles at all QTLs increased each trait. The PCR-based markers flanking these four QTLs may be useful for improvement of GLA, GLS and WPR.

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