This study was carried out to develop new zoysiagrass (Zoysia japonica Steud.) cultivar ‘Halla Green 2’ (Grant number: No. 118). To develop a zoysiagrass cultivar with dwarfism by using the mutation breeding method, the wild type control "Gosan" plants were irradiated using a 30 Gy gamma ray source in 2010. Dwarf mutants were selected from the mutated grasses in successive generations. Dwarf mutant lines were identified and a new zoysiagrass variety Halla Green 2 was developed. The plant height of Halla Green 2 was 3.4 and 1.8 times lower than that of Gosan and Zenith, respectively. This cultivar has dwarf characteristics such as shorter sheath, shorter leaf blade, shorter flag leaf, and shorter third internode of stolon compared to those of Gosan and Zenith. Additionally, the sheaths and leaf blades color of Gosan, Zenith and Halla Green 2 were all light green, whereas their stolons were purple, yellow-green and yellow green, respectively. Trichomes(hairs) were visible on both adaxial and abaxial surfaces of the Gosan leaves, whereas only on the adaxial side of the Zenith and Halla Green 2 leaves. The Halla Green 2 grass showed distinguishable morphological traits compared to those of wild type Gosan and Zenith.

• 송인자(제주대학교 아열대원예산업연구소) | In-Ja Song (Subtropical Horticulture Research Institute, Jeju National University, Jeju, 63243, Korea)
• 선현진(제주대학교 아열대원예산업연구소) | Hyeon-Jin Sun (Subtropical Horticulture Research Institute, Jeju National University, Jeju, 63243, Korea)
• 정옥철(제주대학교 아열대원예산업연구소) | Ok-Cheol Jeong (Subtropical Horticulture Research Institute, Jeju National University, Jeju, 63243, Korea)
• 양대화(제주대학교 아열대원예산업연구소) | Dae-Hwa Yang (Subtropical Horticulture Research Institute, Jeju National University, Jeju, 63243, Korea)
• 진일두(제주대학교 아열대원예산업연구소) | Il-Doo Jin (Subtropical Horticulture Research Institute, Jeju National University, Jeju, 63243, Korea)
• 강홍규(제주대학교 아열대원예산업연구소) | Hong-Gyu Kang (Subtropical Horticulture Research Institute, Jeju National University, Jeju, 63243, Korea)
• 고석민(제주대학교 아열대원예산업연구소) | Suk-Min Ko (Subtropical Horticulture Research Institute, Jeju National University, Jeju, 63243, Korea)
• 권용익(제주대학교 아열대원예산업연구소) | Yong-Ik Kwon (Subtropical Horticulture Research Institute, Jeju National University, Jeju, 63243, Korea)
• 배태웅(제주대학교 아열대원예산업연구소) | Tae-Woong Bae (Subtropical Horticulture Research Institute, Jeju National University, Jeju, 63243, Korea)
• 송필순(제주대학교 아열대원예산업연구소) | Pill-Soon Song (Subtropical Horticulture Research Institute, Jeju National University, Jeju, 63243, Korea)
• 이효연(제주대학교) | Hyo-Yeon Lee (Faculty of Biotechnology, Jeju National University, Jeju, 63243, Korea) Corresponding author