scholarly journals Characterization of QTLs and Candidate Genes for Days to Heading in Rice Recombinant Inbred Lines

Genes ◽  
2020 ◽  
Vol 11 (9) ◽  
pp. 957 ◽  
Author(s):  
Youngjun Mo ◽  
Jong-Min Jeong ◽  
Su-Kyung Ha ◽  
Jinhee Kim ◽  
Changmin Lee ◽  
...  
Keyword(s):  
Recombinant Inbred ◽  
Recombinant Inbred Lines ◽  
Heading Date ◽  
Additive Effect ◽  
Japonica Rice ◽  
Rice Cultivars ◽  
Breeding Programs ◽  
Days To Heading ◽  
Target Environment

Understanding the gene mechanisms controlling days to heading (DH) is important in rice breeding for adaption in the target environment. Using a recombinant inbred line population derived from the cross between two japonica rice cultivars, Koshihikari and Baegilmi, we identified three consistent quantitative trait loci (QTLs) for DH for two years, qDH3, qDH6, and qDH7 on chromosomes 3, 6, and 7, respectively. While Baegilmi contributed the allele for early heading at qDH6 and qDH7 with the additive effect of five days each, Koshihikari contributed the allele for early heading at qDH3 with the additive effect of three days. Notably, pyramiding two or more alleles for early heading at these QTLs accelerated heading effectively. Sequencing of Hd16, Hd1, and Ghd7, the previously known heading date genes underlying qDH3, qDH6, and qDH7, respectively, revealed that Baegilmi and Koshihikari carry different alleles at the three genes. Molecular markers were developed to screen the allelic compositions of the three genes among 295 Korean commercial rice cultivars. The results showed that few cultivars carry alleles for early heading at the three genes, highlighting that DH can be further accelerated and fine-tuned in breeding programs by combining the desirable alleles of Hd16, Hd1, and Ghd7.

scholarly journals Mapping Quantitative Trait Loci for Yield Potential Traits in Wheat Recombinant Inbred Lines

Agronomy ◽  
2020 ◽  
Vol 11 (1) ◽  
pp. 22
Author(s):  
Chon-Sik Kang ◽  
Young-Jun Mo ◽  
Kyeong-Min Kim ◽  
Kyeong-Hoon Kim ◽  
Jae-Buhm Chun ◽  
...  
Keyword(s):  
Quantitative Trait Loci ◽  
Quantitative Trait ◽  
Recombinant Inbred ◽  
Recombinant Inbred Lines ◽  
Heading Date ◽  
Tiller Number ◽  
Spike Length ◽  
Yield Potential ◽  
Days To Heading ◽  
Trait Loci

Selecting wheat with favorable spike characteristics has been a popular breeding strategy to improve sink capacity and yield potential. In the present study, quantitative trait loci (QTLs) for yield potential traits were identified using a recombinant inbred line (RIL) population derived from the cross between Taejoong and Keumkang, two Korean wheat cultivars. A linkage map encompassing a total genetic length of 6544.8 cM was constructed using 838 single nucleotide polymorphisms from the 35K Axiom Wheat Breeder’s Array. We detected eight QTLs for four yield potential traits that are consistently identified in at least two of the three environments, that is, one for days to heading date (QDHD-1 on chromosome 7B), three for spike length (QSL-1, QSL-2, and QSL-3 on chromosomes 1D, 5A, and 6A, respectively), one for tiller number (QTN-1 on chromosome 5B), and three for length of center rachis (QLCR-1, QLCR-2, and QLCR-3 on chromosomes 1B, 5B, and 6A, respectively). Notably, Taejoong contributed the alleles for long spike at all three spike length QTLs with the additive effects of 0.6 cm, 0.6 cm, and 0.9 cm at QSL-1, QSL-2, and QSL-3, respectively. No significant two-way or three-way interaction was observed among QSL-1, QSL-2, and QSL-3, indicating that pyramiding the Taejoong alleles at the three QTLs can increase spike length additively. While the Taejoong alleles at QSL-1, QSL-2, and QSL-3 were associated with increased days to heading date, more kernels per spike, and reduced tiller number per plant, the extent of the pleiotropic effects were different among the three QTLs. Due to the limited number of molecular markers and mapping resolution, further work is required to narrow down the identified QTLs and characterize their effects more precisely. Our results would provide useful information for modulating spike characteristics and improving yield potential in wheat breeding programs.

scholarly journals Genome Sequence and QTL Analyses Using Backcross Recombinant Inbred Lines (BILs) and BILF1 Lines Uncover Multiple Heterosis-related Loci

2020 ◽  
Vol 21 (3) ◽  
pp. 780 ◽  
Author(s):  
Yahui Yu ◽  
Mengmeng Zhu ◽  
Yue Cui ◽  
Yu Liu ◽  
Zhenyu Li ◽  
...  
Keyword(s):  
Molecular Mechanism ◽  
Genome Sequence ◽  
Recombinant Inbred ◽  
Genetic Background ◽  
Recombinant Inbred Lines ◽  
Inbred Lines ◽  
Japonica Rice ◽  
Grain Number ◽  
Grain Number Per Panicle ◽  
Backcross Recombinant Inbred Lines

Heterosis is an interesting topic for both breeders and biologists due to its practical importance and scientific significance. Cultivated rice (Oryza sativa L.) consists of two subspecies, indica and japonica, and hybrid rice is the predominant form of indica rice in China. However, the molecular mechanism underlying heterosis in japonica remains unclear. The present study determined the genome sequence and conducted quantitative trait locus (QTL) analysis using backcross recombinant inbred lines (BILs) and BILF1 lines to uncover the heterosis-related loci for rice yield increase under a japonica genetic background. The BIL population was derived from an admixture variety Habataki and japonica variety Sasanishiki cross to improve the genetic diversity but maintain the genetic background close to japonica. The results showed that heterosis in F1 mainly involved grain number per panicle. The BILF1s showed an increase in grain number per panicle but a decrease in plant height compared with the BILs. Genetic analysis then identified eight QTLs for heterosis in the BILF1s; four QTLs were detected exclusively in the BILF1 population only, presenting a mode of dominance or super-dominance in the heterozygotes. An additional four loci overlapped with QTLs detected in the BIL population, and we found that Grains Height Date 7 (Ghd7) was correlated in days to heading in both BILs and BILF1s. The admixture genetic background of Habataki was also determined by subspecies-specific single nucleotide polymorphisms (SNPs). This investigation highlights the importance of high-throughput sequencing to elucidate the molecular mechanism of heterosis and provides useful germplasms for the application of heterosis in japonica rice production.

scholarly journals Characterization of eating quality and starch properties of two Wx alleles japonica rice cultivars under different nitrogen treatments

2020 ◽  
Vol 19 (4) ◽  
pp. 988-998 ◽  
Author(s):  
Shuang-jie HUANG ◽  
Chun-fang ZHAO ◽  
Zhen ZHU ◽  
Li-hui ZHOU ◽  
Qing-huan ZHENG ◽  
...  
Keyword(s):  
Eating Quality ◽  
Japonica Rice ◽  
Rice Cultivars ◽  
Starch Properties ◽  
Nitrogen Treatments

Characterization of opaque2 modifier QTLs and candidate genes in recombinant inbred lines derived from the K0326Y quality protein maize inbred

2010 ◽  
Vol 122 (4) ◽  
pp. 783-794 ◽  
Author(s):  
David R. Holding ◽  
Brenda G. Hunter ◽  
John P. Klingler ◽  
Song Wu ◽  
Xiaomei Guo ◽  
...  
Keyword(s):  
Candidate Genes ◽  
Recombinant Inbred ◽  
Recombinant Inbred Lines ◽  
Inbred Lines ◽  
Quality Protein Maize
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