‘Hyowon 4’, a new medium maturing glutinous rice variety was developed by the rice breeding team of Pusan National University in 2013. This cultivar was derived from a cross between ‘Boseokchal’ and ‘Donna’ with good glutinous property. During F3~F8 generation, breeding lines were selected by a pedigree breeding method. As a result, the promising line (JS23-4-39-14-5-1-1-1) with good glutinous property was advanced and designated as the name of ‘SP 106’ in 2012. This variety headed on Aug. 15, which is 2 days later than ‘Dongjinchal’ in middle plane. The culm length and panicle length of this variety was 82.4 cm and 21.1 cm, respectively. This variety has about 13.9 tillers per a hill and 100 spikelets per a panicle. The ratio of ripened grain is about 92.0% and 1000-grain weight was 20.9 g in brown rice. The yield performance was 5.03 MT/ha in local adaptability test.

Goami 2 is now well known as its extinguishing endosperm characteristics - it is far from the wild type, Ilpum, a premium taste Korean japonica cultivar. The endosperm of Goami 2 is high in fat, protein, and indigestible carbohydrate contents. One of the most extraordinary endosperm characteristic of Goami 2 is high level of amylose content, even though the hulled rice (brown rice) is totally opaque. There have been many studies to address the unique physico-chemical properties and possible usages as a healthy and functional food ingredient, especially, the high-amylose rice had a positive effect on lowering the blood glucose response in obesity and type 2 diabetes. Genetic analysis by using 44 SSR markers, crude linkage map (3~5 anchor markers per chromosome) was then constructed based on the genotypes detected among 112 F2 progenies derived from Goami 2 / Milyang 23 showed that major chromosomal regions on Chromosome 2 responsible for the variation of amylose contents. M2-53 on Chromosome 2 explains the highest variation and this region has not been reported as a putative QTL for amylose contents yet. More closely markers for application to breeding program can be developed using MutMap or Re-sequence methods.