Quantitative trait loci

Genetic analysis of grain shape and weight after cutting rice husk

J. R. Fu, Zhu, L. X., Sun, X. T., Zhou, D. H., Ouyang, L. J., Bian, J. M., He, H. H., and Xu, J., “Genetic analysis of grain shape and weight after cutting rice husk”, vol. 14, pp. 17739-17748, 2015.

Grain shape and weight are the most important components of rice yield and are controlled by quantitative trait loci (QTLs). In this study, a double-haploid population, derived from the cross of japonica CJ06 and indica TN1, was used to analyze QTLs for grain shape and weight under two conditions: normal growth with unbroken husk and removing partial husk after flowering. Correlation analysis revealed that these traits, except grain weight, had a connection between the two conditions.

Identification of QTLs of resistance to white mold in common bean from multiple markers by using Bayesian analysis

L. A. C. Lara, Santos, J. B., Balestre, M., Lima, I. A., Pamplona, A. K. A., Veloso, J. S., and Silva, P. H., “Identification of QTLs of resistance to white mold in common bean from multiple markers by using Bayesian analysis”, vol. 14, pp. 1124-1135, 2015.

In this study, we identified simple sequence repeat, ampli­fied fragment length polymorphism, and sequence-related amplified poly­morphism markers linked to quantitative trait loci (QTLs) for resistance to white mold disease in common bean progenies derived from a cross between lines CNFC 9506 and RP-2, evaluated using the oxalic acid test and using Bayesian analysis. DNA was extracted from 186 F2 plants and their parental lines for molecular analysis.

Genetic analysis of seed-shattering genes in rice using an F3:4 population derived from an Oryza sativa x Oryza rufipogon cross

S. - J. Kwon, Yu, J., Park, Y. J., Son, J. - H., Kim, N. - S., and Lee, J. K., “Genetic analysis of seed-shattering genes in rice using an F3:4 population derived from an Oryza sativa x Oryza rufipogon cross”, vol. 14, pp. 1347-1361, 2015.

Seed shattering of wild plant species is thought to be an adaptive trait to facilitate seed dispersal. For rice breeding, seed shatter­ing is an important trait for improving breeding strategies, particularly when developing lines use interspecific hybrids and introgression of genes from wild species. We developed F3:4 recombinant inbred lines from an interspecific cross between Oryza sativa cv. Ilpoombyeo and Oryza rufipogon. In this study, we genetically analyzed known shat­tering-related loci using the F3:4 population of O.

Genetic dissection of agronomic traits in Capsicum baccatum var. pendulum

M. M. Moulin, Rodrigues, R., Bento, C. S., Gonçalves, L. S. A., Santos, J. O., Sudré, C. P., and Viana, A. P., “Genetic dissection of agronomic traits in Capsicum baccatum var. pendulum”, vol. 14, pp. 2122-2132, 2015.

Genetic mapping is very useful for dissecting complex agronomic traits. Genetic mapping allows for identification of quantitative trait loci (QTL), provide knowledge on a gene position and its adjacent region, and enable prediction of evolutionary mechanisms, in addition to contributing to synteny studies. The aim of this study was to predict genetic values associated with different agronomic traits evaluated in an F2 population of Capsicum baccatum var. pendulum. Previously, a reference genetic map for C.

Genetic analysis of QTL for eye cross and eye diameter in common carp (Cyprinus carpio L.) using microsatellites and SNPs

S. B. Jin, Zhang, X. F., Lu, J. G., Fu, H. T., Jia, Z. Y., and Sun, X. W., “Genetic analysis of QTL for eye cross and eye diameter in common carp (Cyprinus carpio L.) using microsatellites and SNPs”, vol. 14, pp. 3557-3569, 2015.

A group of 107 F1 hybrid common carp was used to construct a linkage map using JoinMap 4.0. A total of 4877 microsatellite and single nucleotide polymorphism (SNP) markers isolated from a genomic library (978 microsatellite and 3899 SNP markers) were assigned to construct the genetic map, which comprised 50 linkage groups. The total length of the linkage map for the common carp was 4775.90 cM with an average distance between markers of 0.98 cM.

QTLs for rice flag leaf traits in doubled haploid populations in different environments

J. Cai, Zhang, M., Guo, L. B., Li, X. M., Bao, J. S., and Ma, L. Y., “QTLs for rice flag leaf traits in doubled haploid populations in different environments”, vol. 14, pp. 6786-6795, 2015.

Two rice doubled haploid (DH) populations derived from the crosses of ZYQ8/JX17 and CJ06/TN1 were used to detect quantitative trait loci (QTLs) for flag leaf length (FLL), width (FLW), and angle (FLA) under long-day conditions in Hangzhou (subtropical zone) and short-day conditions in Hainan (tropical zone), China. The four parents differed significantly in all 3 traits. FLL was found to be positively correlated with FLW in the 2 populations. A total of 30 QTLs were identified for flag leaf traits, with a contribution to the phenotypic variation of each QTL from 4.49 to 26.30%.

Mapping quantitative trait loci for the lysozyme level and immunoglobulin G blocking percentage of classical swine fever virus

X. Lu, Gong, Y. F., Liu, J. F., Liu, Y., and Zhang, Q., “Mapping quantitative trait loci for the lysozyme level and immunoglobulin G blocking percentage of classical swine fever virus”, vol. 13, pp. 283-290, 2014.

Increased disease resistance through improved general immune capacity would be beneficial for the welfare and productivity of farm animals. Classical swine fever (CSF) is a contagious disease in farm animals. The immunoglobulin G (IgG) blocking percentage of CSF virus (CSFV) in serum is an essential diagnostic parameter in veterinary practice. In addition, lysozymes are a part of the innate immune system.

Quantitative trait loci mapping for kernel row number using chromosome segment substitution lines in maize

F. Li, Jia, H. T., Liu, L., Zhang, C. X., Liu, Z. J., and Zhang, Z. X., “Quantitative trait loci mapping for kernel row number using chromosome segment substitution lines in maize”, vol. 13, pp. 1707-1716, 2014.

Unveiling the genetic architecture of grain yield and yield-related traits is useful for guiding the genetic improvement of crop plants. Kernel row number (KRN) per ear is an important yield component, which directly affects the grain yield of maize. In this study, we constructed a set of 130 chromosome segment substitution lines (CSSLs), using Nongxi531 as the donor parent and H21 as recipient parent, by continuous backcrossing and selfing.

Molecular detection of QTL controlling plant height components in a doubled haploid barley population

X. F. Ren, Sun, D. F., Dong, W. B., Sun, G. L., and Li, C. D., “Molecular detection of QTL controlling plant height components in a doubled haploid barley population”, vol. 13, pp. 3089-3099, 2014.

Yield losses caused by lodging in barley can be partially controlled by reducing plant height. In order to understand dwarfing mechanisms and efficiently use new dwarf germplasms for a breeding program, it is important to identify QTL of plant height components. QTL analysis was performed for seven plant height component traits using a DH population of 122 lines derived from the cross of Huaai 11 x Huadamai 6. Composite interval mapping procedures detected 20 QTL, which were mapped onto chromosomes 2H, 3H, 5H, 6H, and 7H.

Mapping of quantitative trait loci for the bolting trait in Brassica rapa under vernalizing conditions

Y. G. Wang, Zhang, L., Ji, X. H., Yan, J. F., Liu, Y. T., Lv, X. X., and Feng, H., “Mapping of quantitative trait loci for the bolting trait in Brassica rapa under vernalizing conditions”, vol. 13, pp. 3927-3939, 2014.

Premature bolting can occur occasionally during spring cultivation of heading Chinese cabbage in East Asia when the plants encounter low temperatures (vernalization), leading to economic loss. Breeding bolting-resistant cultivars is the best choice for solving this problem. We looked for QTLs responsible for varietal differences in the bolting trait in Brassica rapa under environmental conditions that promote vernalization.

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