장립종 장원형 입형특성의 자포니카 중만생 벼 ‘제이제이625엘지’

• Published in: Korean journal of breeding Vol. 57; no. 3; pp. 301 - 313
• Main Author: 박현수(Hyun-Su Park), 백만기(Man-Kee Baek), 서정필(Jung-Pil Suh), 정오영(O-Young Jeong), 이창민(Chang-Min Lee), 김춘송(Choon-Song Kim), 정지웅(Ji-Ung Jeung), 김우재(Woo-Jae Kim), 정종민(Jong-Min Jeong), 모영준(Youngjun Mo), 하수경(Su-Keyong Ha), 최현구(Hyun Gu Choi), 박슬기(Seul-Gi Park), 진민아(Mina Jin), 박재령(Jae-Ryoung Park), 서정환(Jeonghwan Seo), 박송희(Songhee Park)
• Format: Journal Article
• Language: Korean
• Published: 한국육종학회 01.09.2025; The Korean Breeding Society
• Subjects: 농학; JJ625LG; japonica; long grain; spindle-shaped grain; rice
• ISSN: 0250-3360; 2287-5174
• DOI: 10.9787/KJBS.2025.57.3.301

The intermediate breeding material ‘JJ625LG’ was developed to diversify thegrain shape characteristics of Korean japonica rice cultivars. ‘JJ625LG’ was derived from across between ‘HR30198-AC33 (DGS79),’ a japonica breeding material with extra-longand spindle-shaped grains, and ‘Boramchan,’ a high-yielding japonica cultivar with excellentcultivation stability and medium-short and semi-round grains. By employing both bulk andpedigree breeding methods, strong selection pressure was applied to eliminate undesirabletraits inherited from ‘DGS79,’ such as very late heading, long awns, and susceptibility tolodging. Consequently, elite lines with long spindle-shaped grains on a japonica backgroundwere selected. These lines subsequently underwent yield performance and localadaptability tests, during which their agronomic traits were comprehensively evaluated,leading to the final selection of ‘JJ625LG.’ The heading date of ‘JJ625LG’ was August 16th,three days later than that of ‘Nampyeong’. Its culm length was similar to ‘Nampyeong.’‘JJ625LG’ exhibited a higher number of spikelets per panicle, fewer panicles per plant, andheavier 1,000-grain weight than brown rice. Additionally, it showed strong resistance tobacterial blight (races K1, K2, and K3) but was susceptible to viral diseases and insectpests, indicating the need for further improvement in these areas. Its grain yield was comparableto that of ‘Nampyeong.’ With a brown rice grain length of 6.34 mm, ‘JJ625LG’ wasclassified as a long-grain type and had a grain length-to-width ratio of 2.64, reflecting aspindle-shaped morphology. It carried the GW2-gs3-qSW5 allele combination associatedwith grain shape, which is a genetic profile not found in existing Korean japonica cultivars. Although its milling recovery rate was similar to that of ‘Nampyeong,’ the presence of manybroken rice due to its long grain shape resulted in a lower percentage of head rice. The eatingquality of ‘JJ625LG’ was excellent, with its grains exhibiting the sticky and soft texturetypical of japonica rice and receiving high scores in sensory evaluation. As the first intermediatebreeding material in Korea with long and spindle-shaped grains in a japonicabackground, ‘JJ625LG’ is expected to contribute significantly to diversifying the traditionallynarrow grain shape spectrum of Korean japonica rice cultivars (Registration No. 10166). KCI Citation Count: 0