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A cultivar of lettuce (Lactuca sativa L.) with sharply large oval and purple leaf, ‘Jahokmaschima’, which has late bolting and a high yield, was developed from a cross between ‘Bulkkoch’ (dark red leaf color and early bolting) and ‘Cheongpung’ (high yield). The cross and selection for advanced lines was conducted by the pedigree method between 2005 and 2011. The advanced lines were evaluated for yield and adaptability at six locations in Korea (Gangwon-do, Gyeonggi-do, Chungcheongbuk-do, Jeollabuk-do, Gyeongnam-do, and Jeju-do) for 3 years until 2014. The ‘Jahokmaschima’ lettuce has a gray seed color, and the leaf type of the matured stage is a large oval leaf, leaf no. 67 per plant, and late bolting. In particular, the ‘Jahokmaschima’ has good resistant to tip burn in the growth period. The anthocyanin and vitamin C content of ‘Jahokmaschima’ were lower than those of ‘Tomallin’, at 4.05 mg/100g and 27.7 mg/100g, respectively. The BSL (bitter sesquiterpene lactones; latucin, 8-deoxylactucin, and lactucopicrin) content of ‘Jahokmaschima’ was lower than that of ‘Tomallin’, at 2.120 µg/g DW. Compared with ‘Tomallin’, the marketable yield of ‘Jahokmaschima’ was 1% higher (at 374 g per plant) and particularly improved late in bolting in high temperature cultivation in the field. The shelf-life of ‘Jahokmaschima’ was similar to ‘Tomallin’ at 4ºC. Furthermore, it tasted better, and was crispier and sweeter than ‘Tomallin’. Thus, we recommend that the new cultivar ‘Jahokmaschima’ is suitable for cultivation in spring and fall.

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