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CROP PHYSIOLOGY & METABOLISM

Identification of Quantitative Trait Loci for ¹³C and Productivity in Irrigated Lowland Rice

^a Department of Rice Research, National Institute of Crop Science (NICS), 2-1-18, Kannondai, Tsukuba-city, Ibaraki, 305-8518, Japan
^b Nagasaki Industrial Promotion Foundation, 5-717-1 Fukahori, Nagasaki-city, Nagasaki, 851-0301, Japan

^* Corresponding author (chokai{at}naro.affrc.go.jp)

Stable carbon isotope ratio (¹³C) in plants has been suggested as a useful indicator for cumulative Ci/Ca signature in a leaf, water use efficiency, and crop productivity, and is known to have genotypic variation in rice (Oryza sativa L.). We conducted a field study to identify quantitative trait loci (QTLs) for ¹³C and other related leaf traits, such as leaf N, specific leaf area, and SPAD value, using recombinant inbred lines derived from an indica x japonica cross grown under flooded conditions. We also examined the genetic associations of ¹³C with yield, yield components, and biomass productivity. Putative QTLs for ¹³C were identified on chromosomes 2, 4, 8, 9, 11, and 12 across plant parts, stages, and years. Differential expression of QTL for ¹³C among stages suggests that each QTL had different functions by stages. The QTLs for ¹³C were associated with a few colocated QTLs for leaf traits indicating that their physiological and genetic associations with leaf traits may be complex. Values of ¹³C at maturity were negatively correlated with harvest index and grain yield. However, genetic association of these traits could not be clarified due to the absence of co-located QTLs. Further examination would be useful to elucidate the physiological and morphological functions of QTLs for ¹³C found in this study.

Abbreviations: Ci/Ca, ratio of intercellular and ambient partial pressures of CO₂ • CID, carbon isotope discrimination • ¹³C, ¹³C/¹²C ratio expressed with a differential notation • DTH, days to heading • HI, harvest index • LOD, logarithm of the odds • NPT, new plant type • QTLs, quantitative trait loci • RILs, recombinant inbred lines • SLA, specific leaf area • SLN, specific leaf N • TDW, aboveground dry weight

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