A New High-Yielding Red Leaf Lettuce, “Jeokdan”

Abstract

A new high yield and storability lettuce (Lactuca sativa L.) cultivar Jeokdan was developed from a cross NAAES DL14 (late bolting and high yield) and NAAES DL 108 (late bolting and disease resistance) in 1997. We selected desired charac-2003 year, and we fixed good lines. These lines were evaluated for yield and stability in 7 areas (Gangwon, Kyunggi, Chungbuk,Kyungnam, Jeonnam, Jeonbuk, Jeju) for 2 years in Korea. The “Jeokdan” has gray seed color and transverse elliptic leaves. TheJeoksagye has gray seed color and transverse elliptic leaves. Compared to Ttugseom-jeokchugmyeon marketable yield of Jeokdanwas heavier as a 462 g per plant, and also can be stored 3 weeks more at 4oamount of total bitter sesquiterpene lactones (BSL) of 63.8g/g than the check variety of 109.8g/g dry weight.