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If you do not receive an email within 10 minutes, your email address may not be registered, and you may need to create a new Wiley Online Library account. If the address matches an existing account you will receive an email with instructions to retrieve your username. The Plant Journal Volume 97, Issue 6. Lidan Sun Corresponding Author E-mail address: sunlidan bjfu. Search for more papers by this author. Rongling Wu Corresponding Author E-mail address: rwu bjfu. Read the full text. Tools Request permission Export citation Add to favorites Track citation.
Share Give access Share full text access. Share full text access. Please review our Terms and Conditions of Use and check box below to share full-text version of article. Summary Many quantitative traits are composites of other traits that contribute differentially to genetic variation. Accuracy analysis of curve estimation through computer simulation under different heritabilities H 2 and sample size n at three hypothesized genotypes by the dissection model a—c and composite model d.
List of significant SNPs some of which can be annotated in the mapping population of the Euramerican poplar detected by dissection and composite models. List of significant SNPs some of which can be annotated in the mapping population of Euphrates poplar detected by dissection and composite models. This strategy has at least three major advantages over the conventional breeding and MAS. Third, most importantly, this strategy allows complete integration of QTL mapping and allelic mining with breeding.
Nevertheless, mapping QTL affecting target traits such as DT in this study is challenging because of the small population sizes and the reduced trait variances in the selected populations. This can be improved by combining several populations together and performing a joint analysis for segregation distortion locus in multiple populations in the same GBs Cui et al. In practice, we noted that when all HHZ ILs derived from the three BC populations were pooled for mapping of non-target trait such as LNT, the introgressed segments were not evenly distributed across genome in the ILs, even though the donor introgression in the ILs covered most rice genome.
As a result, the number of QTL detected for each of the non-target traits were fewer than most reported cases using random mapping populations. Nevertheless, as demonstrated in this study, association analysis still can be applied to such breeding populations effectively for identifying QTL affecting non-target traits such as LNT in this study and cold tolerance in our previous studies Zhang et al. Compared with random mapping populations widely performed before, ILs are not only cost-effective both in phenotyping and genotyping owing to small number of lines, but also easily integrate with MB by DQP for both target and non-target traits based on the performances and distribution of QTL alleles in ILs in elite backgrounds, thus, providing a huge potential application in future plant breeding programs.
In this study, we identified nine DT loci, five Specifically, qDT3. The qSF8 , detected consistently in all three conditions in ES, was probably related to the qGNA8a , which was previously identified for grain nitrogen accumulation Li et al. For instance, qPN1 was most probably related to rrw1b for relative root weight, n-p1 for plant weight, n-s1 for shoot weight measured at rice seedling stage under LN conditions Lian et al.
Coupling with automation techniques, PCR-based system can be used to survey thousands of samples in a short time-frame. Different from array-based or sequencing-based systems, where SNP markers were either fixed or randomly assayed, PCR-based system is very flexible on selecting SNP markers to be assayed, which make it ideal for MAS and multi-trait pyramiding. Two polymorphic KASP markers flanking each target QTL Tables 3 , 4 were then selected for genotyping the pyramiding population to determine the favorable allele in the progeny. This way, the genotyping cost was greatly reduced and turn over time is shortened.
All pyramiding lines in groups 1—4 showed expected increased phenotype, suggesting that our selection based on KASP SNP markers was highly accurate. Registered by 12 provinces in China, HHZ is a mega-variety with good yield potential and excellent grain quality. It also showed wide adaptability in many tropic countries in Asia and Africa Ali et al. However, it has lost its popularity because of its susceptibility to many abiotic stresses such as drought, salinity, high temperature, and disease resistance.
In addition, HHZ is insensitivity to N fertilizer, i. However, we have shown that considerable variation remains in the selected ILs for non-target traits such as LNT as indicated in this study, cold tolerance Zhu et al. Based on distribution of favorable QTL alleles and phenotypic performance of the target trait such as DT, salt tolerance, submergence tolerance, and non-target trait LNT such as cold tolerance, bacterial blight resistance in the selected ILs, DQP was easily carried out to pyramid different favorable alleles of multiple abiotic and biotic stress tolerances by MAS.
Many pyramiding lines were selected as expected in this study. Almost all favorable alleles at the detected QTL were from the three donors. BF and WZ drafted the manuscript. JX and ZL revised the manuscript. All authors approved the final version to be published. The authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest. Ali, J. Muralidharan and E. Google Scholar.
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Genetic and molecular dissection of naturally occurring variation. - Abstract - Europe PMC
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