Identification of quantitative trait loci for δ13C and productivity in irrigated lowland rice
Identification of quantitative trait loci for δ13C and productivity in irrigated lowland rice
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DOI：
10.2135/cropsci2005.05.0084
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发表时间：
2006-03-01
期刊：
影响因子：
2.3
通讯作者：
Imbe, T
中科院分区：
文献类型：
--
作者：
Laza, MR;Kondo, M;Imbe, T
植物中的稳定碳同位素比值（Δ C-13）已被认为是叶片中累积Ci/Ca特征、水分利用效率和作物生产力的有用指标，并且已知在水稻（Oryza sativa L.）中具有基因型变异。我们进行了一项田间研究，以确定数量性状位点（QTL）的δ C-13和其他相关的叶性状，如叶氮，比叶面积，和SPAD值，使用重组自交系来自一个籼×粳稻杂交在淹水条件下生长。我们还研究了Δ C-13与产量、产量构成因素和生物量生产力的遗传关联。δ C-13的推定QTL在植物部分、阶段和年份的第2、4、8、9、11和12号染色体上被鉴定。δ C-13的QTL在不同生育期的差异表达表明，每个QTL在不同生育期具有不同的功能。δ C-13的QTL与少数叶性状的QTL共定位，表明它们与叶性状的生理和遗传关联可能是复杂的。成熟期δ C-13值与收获指数和产量呈负相关。然而，这些性状的遗传关联不能澄清，由于缺乏共定位的QTL。进一步的研究将有助于阐明本研究中发现的δ C-13 QTL的生理和形态功能。
Stable carbon isotope ratio (delta C-13) 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 delta C-13 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 delta C-13 with yield, yield components, and biomass productivity. Putative QTLs for delta C-13 were identified on chromosomes 2, 4, 8, 9, 11, and 12 across plant parts, stages, and years. Differential expression of QTL for delta C-13 among stages suggests that each QTL had different functions by stages. The QTLs for delta C-13 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 delta C-13 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 delta C-13 found in this study.