The 10th Asian Crop Science Association Conference

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Oral sessions

Crop Genetics and Physiology » O44: Root Genetics and Breeding

[O44] Root Genetics and Breeding

*Sponsored by the Japanese Society of Breeding

Fri. Sep 10, 2021 9:45 AM - 11:45 AM Room 4 (Oral) (Crop Genetics and Physiology)

Chair: Yoshiaki Inukai (Nagoya University, Japan)
Chair: Yinglong Chen (The University of Western Australia, Australia)

10:55 AM - 11:10 AM

[O44-05] Physiological Traits and Genomic Regions Associated with Rice (Oryza sativa L.) Root Cone Angle Grown in an Aerobic Production System

*Nominated for Presentation Awards

○Ricky Vinarao1, Christopher Proud1, Xiaolu Zhang1, Peter Snell2, Shu Fukai1, Jaquie Mitchell1 (1.School of Agriculture and Food Sciences, The University of Queensland, Australia, 2.Department of Primary Industries, Yanco Agricultural Institute, Australia)

Aerobic rice production system (AP) uses less water than traditional flooded culture, and could be a solution to the imminent water availability crisis brought about by changing climate. Genotypes with narrow root cone angle (RCA) could produce deep root system, and are considered to be adapted to AP. This study aims to physiologically characterise recombinant inbred lines derived from IRAT109 for RCA and related traits and to determine genomic loci associated with these traits through genome wide association (GWA) mapping. The second season field trial which evaluated 18 selected top and tail lines identified in a glasshouse experiment, revealed significant genotypic variation in RCA, early vigour (EV), light interception, canopy temperature depression, leaf death, pulling score (PS), days-to-heading (DTH), biomass, plant height, panicle weight (PW), harvest index, and grain yield. Genotypes with narrower RCA achieved higher EV and PS, indicating their advantage in early growth and root system development. GWA identified a consistent genomic region associated with RCA located in chromosome 4. Genotypes with the target allele had narrower RCA, higher EV, PS, DTH and PW compared with genotypes with non-target allele. Post QTL analysis and allele mining identified a NAC TF candidate gene. Evaluation of narrow RCA in intermittent water stress conditions and development of molecular markers are underway. This study provides physiological and genomic understanding of RCA and with genomics-based breeding, will hasten the development of AP-adapted, sustainably produced rice.