Plant Breeding and Biotechnology

The Korean Society of Breeding Science (한국육종학회)
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Identification of Heterosis QTLs for Yield and Yield-Related Traits in Indica-Japonica Recombinant Inbred Lines of Rice (Oryza sativa L.)

  • Kim, Chang-Kug (Genomics Division, National Institute of Agricultural Sciences, Rural Development Administration) ;
  • Chu, Sang-Ho (Center for Crop Breeding on Omics and Artificial Intelligence, Kongju National University) ;
  • Park, Han Yong (Department of Bioresources Engineering, College of Life Sciences, Sejong University) ;
  • Seo, Jeonghwan (Department of Plant Science and Research Institute for Agriculture and Life Sciences, Plant Genomics and Breeding Institute, Seoul National University) ;
  • Kim, Backki (Department of Plant Science and Research Institute for Agriculture and Life Sciences, Plant Genomics and Breeding Institute, Seoul National University) ;
  • Lee, Gileung (Department of Plant Science and Research Institute for Agriculture and Life Sciences, Plant Genomics and Breeding Institute, Seoul National University) ;
  • Koh, Hee-Jong (Department of Plant Science and Research Institute for Agriculture and Life Sciences, Plant Genomics and Breeding Institute, Seoul National University) ;
  • Chin, Joong Hyoun (Graduate School of Integrated Bioindustry, Sejong University)
  • Received : 2017.11.22
  • Accepted : 2017.11.24
  • Published : 2017.12.01
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Abstract

Supplying sufficient rice to growing populations is a global challenge. Hybrid indica rice varieties exploiting heterosis have increased yields, but inter-subspecific crosses between indica and japonica varieties are hampered by sterility. Examination and genetic understanding of yield heterosis in indica/japonica crosses addressing yield barriers are basic requirements. In this study, QTLs for heterosis of yield traits were identified in indica-japonica recombinant inbred lines (RILs) using a total of 178 RILs originating from Dasanbyeo (indica) ${\times}$ TR22183 (japonica) (DT-RILs) and their backcrossed populations. Nine of sixty-six major quantitative trait loci (QTLs) identified in DT-RILs exhibited heterosis. Heterosis QTLs clustered with other traits on chromosomes 1, 4, and 8, and clusters were conserved between different RILs. The clusters contained several known yield enhancement genes/QTLs. Specific heterotic allele combinations contributed to four major heterosis QTLs, particularly for panicle and spikelet number traits. Heterosis for yield and yield-related traits was explained by the harmonized effects of overdominance, dominance, and epistatic interactions in inter-subspecific breeding populations.

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Acknowledgement

Supported by : Rural Development Administration, National Research Foundation of Korea (NRF)