High-density mapping of quantitative trait loci for grain-weight and spikelet number in rice
Dong-Min Kim,Hyun Sook Lee,Soo Jin Kwon,Mark Edward Fabreag,Ju Won Kang,Yeo Tae Yun,Chong Tae Chung,Sang-Nag Ahn +7 more
TLDR
Because the Moroberekan alleles for SPP and TGW have been shown to be beneficial in the genetic background of Ilpumbyeo, both the qSPP6 and qTGW6 alleles might prove valuable in improving rice yields.Abstract:
Background: High grain yield is one of the most important traits requiring improvement in rice breeding programs. Consequently, the genetic basis of spikelets per panicle (SPP) and grain weight (TGW) have received much research focus because of their importance in rice yield. Results: In this study, IL28, which is a near isogenic line (NIL) developed by introgressing chromosomal segments of the cultivar ‘Moroberekan’ into the cultivar ‘Ilpumbyeo’, showed a significant increase in the number of spikelets per panicle (SPP) and 1,000-grain weight (TGW) compared to the recurrent parent, Ilpumbyeo. Quantitative trait locus (QTL) analysis in 243 F2 plants derived from a cross between IL28 and Ilpumbyeo indicated that both qSPP6 and qTGW6 are located in the interval RM3430–RM20580. Following substitution mapping with 50 F3:4:5 lines, qSPP6 was mapped to a 429-kb interval between RM20521 and InDel-1, while qTGW6 was mapped to a 37.85-kb interval between InDel-1 and SNP–3 based on the japonica genome sequence. This result indicates that qSPP6 and qTGW6 are different genes. Yield trials with substitution lines indicated that lines harboring the homozygous Moroberekan segment at both the qSPP6 and qTGW6 region showed significantly higher grain yield than Ilpumbyeo. Conclusion: Because the Moroberekan alleles for SPP and TGW have been shown to be beneficial in the genetic background of Ilpumbyeo, both the qSPP6 and qTGW6 alleles might prove valuable in improving rice yields. Closely linked SSR markers are expected to facilitate the cloning of genes that underlie these QTLs, as well as with marker-assisted selection for variation in SPP and TGW in rice breeding programs.read more
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Rice Functional Genomics Research: Past Decade and Future
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TL;DR: A summary of functional genomics platforms, genes and molecular regulatory networks that regulate important agronomic traits, and newly developed tools for gene identification will greatly facilitate the development of green super rice.
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Mitochondrial ORF79 levels determine pollen abortion in cytoplasmic male sterile rice.
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A gene encoding pentatricopeptide repeat protein partially restores fertility in RT98-Type cytoplasmic male-sterile rice
TL;DR: It is concluded that PPR762 is an essential fertility restorer gene for RT98-type CMS, which has the cytoplasm of the wild species Oryza rufipogon and the nuclear genome of the Taichung 65 cultivar.
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Identification and validation of a major chromosome region for high grain number per spike under meiotic stage water stress in wheat (Triticum aestivum L.)
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Journal ArticleDOI
Natural variation in Ghd7 is an important regulator of heading date and yield potential in rice
Weiya Xue,Yongzhong Xing,Xiaoyu Weng,Yu Zhao,Weijiang Tang,Lei Wang,Hongju Zhou,Sibin Yu,Caiguo Xu,Xianghua Li,Qifa Zhang +10 more
TL;DR: It is shown that the quantitative trait locus (QTL) Ghd7, isolated from an elite rice hybrid and encoding a CCT domain protein, has major effects on an array of traits in rice, including number of grains per panicle, plant height and heading date.
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