통일형 벼 이앙 후 유묘기 재배안정성 증진을 위한 저온생장성 관련 QTL 탐색

Identification of QTLs Related to Plant Growth at Low Temperatures in the Seedling Stage of Tongil Type Rice after Transplanting

In Asia, where climate change is increasing the damage caused by cold stress,it is crucial to cultivate varieties with enhanced cold tolerance. In this study, the Tongil variety‘Hanareum2’ was crossed with the Japonica variety ‘Unkwang’ to improve plant growthability at low temperatures during the seedling stage. This led to the development of 234recombinant inbred line (RIL) populations, and a linkage map was constructed using 249single nucleotide polymorphism (SNP) markers. The RIL populations were transplanted tothe field one month earlier than the standard transplanting period, and plant height (PH),leaf number (LN), and dry weight (DW) were measured to identify quantitative trait loci(QTL) associated with plant growth ability at low temperatures during the seedling stage. QTLs related to cold tolerance, particularly those carrying the ‘Unkwang’ allele, were identifiedin the PH and DW traits. For PH, the QTLs qPH1, qPH5, and qPH8 were located onchromosomes 1, 5, and 8, respectively. Regarding DW, the QTLs qDW1, qDW8, and qDW9were identified on chromosomes 1, 8, and 9. For the LN trait, qLN3 carrying the ‘Hanareum2’allele was located on chromosome 3. If the identified QTLs are utilized, they can be incorporatedinto breeding programs for plant growth at low temperatures during the seedlingstage.