![]() ![]() 2014), which has important consequences for employing markers in trees at early stages (Lerceteau et al. QTLs associated with phenotypic variability can be identified accurately by molecular markers in a suitable segregating population (Moraga-Suazo et al. 2013), QTL mapping offers new opportunities for effective tree breeding (Yoshimaru et al. To date, it is the only high-density genetic linkage map that has been constructed predominantly in Taxodiaceae.Ĭompared with traditional tree improvement approaches that involve the selection of superior trees based on growth characteristics, wood properties or biotic and abiotic stress responses during long growth cycles (Nowicka et al. japonica, in which 1261 SNP markers were mapped on 11 LGs. lanceolata using 94 and 101 AFLP markers. ![]() Tong and Shi ( 2004) constructed two maps for C. In Taxodiaceae, just Cryptomeria and Cunninghamia have had several unsaturated maps developed, containing few DNA molecular markers. To the best of our knowledge, the majority of genetic maps in conifers have been reported in Pinaceae. Additionally, MAS for QTLs has been reported in nearly all crop species (Moriguchi et al. 2003) and Pinus lambertiana (Jermstad et al. 2014), Pinus pinaster (Lepoittevin et al. 2001), Pinus radiata (Moraga-Suazo et al. 2005), Pinus taeda (Martínez-García et al. In recent decades, genetic maps have been constructed for many conifers, such as Picea abies (Scotti et al. 2006) and quantitative trait loci (QTLs) mapping (Moriguchi et al. 2011), but also molecular marker-assisted selection (MAS) (Moriguchi et al. 2012), and understanding of genome structure and evolution (Scotti et al. 2012), construction of physical maps, the assembly of whole-genomes (Martínez-García et al. 2013a, b), comparative genomic studies (Moriguchi et al. Linkage maps facilitate not only gene tagging, map-based cloning (Muchero et al. ![]() 2015) and has been widely planted in urban areas and wetlands of eastern China (Zhou et al. ![]() ‘Zhongshanshan 302’ is registered as a Chinese national variety (Zhou et al. Thus, it has great ecological and economic potential (Cheng et al. It is also relatively pest-free and has a higher tolerance of salt, alkalinity and flooding (Zhou et al. It is well known for its fast growth, good form, and strong adaptability to a wide range of soils and climates (Cheng et al. ‘Zhongshanshan 302’ is a superior clone selected from a controlled cross between T. It is more tolerant of salt and alkaline soils, but less tolerant of flooding and cercosporidium needle blight (Creech et al. mucronatum is native to Mexico, much of Guatemala, the tip of South Texas and New Mexico. It is highly resistant to Cercosporidium needle blight and tolerant of flooding, salt, alkalinity and strong winds (Creech et al. distichum is native to the southeastern United States, from Delaware to Texas, and inland up the Mississippi River to southern Indiana. 2014), which are allogamous, wind-pollinated, and diploid with a haploid chromosome number (n) of 11 (2n = 22). Taxodium distichum, Taxodium ascendens and Taxodium mucronatum (Qi et al. Taxodium is a genus containing three coniferous species, viz. This is the first report on the construction of a genetic linkage map and QTL analysis in Taxodium, laying the groundwork for the construction of a high-density genetic map and QTL mapping in the genus Taxodium. Another QTL for crown width (qtCW-2) was detected at 1.0 cM on LG13, with a logarithm of odds value of 3.15, and explained 31.7 % of the total variation of crown width. Four significant QTLs were identified, three of which, namely qtSH-1 for seedling height, qtBD-1 for basal diameter and qtCW-1 for crown width, were located at 2.659 cM of LG7 with logarithm odds values of 3.72, 3.49 and 3.93, respectively, and explained 24.9, 27.0 and 21.7 % of the total variation of the three grown traits, respectively. Quantitative trait loci (QTLs) affecting growth traits, such as seedling height, basal diameter and crown width, were detected based on the constructed linkage map. The map has a total length of 976.5 cM, with a mean distance of 7.0 cM between markers, and contains 34 linkage groups with 179 markers (171 SRAPs and 8 SSRs). In this study, a genetic linkage map was constructed using sequence-related amplified polymorphism (SRAP) and simple sequence repeat (SSR) markers based on an F 1 population containing 148 individuals generated from a cross between T. Taxodium is a genus renowned for its fast growth, good form and tolerance of flooding, salt, alkalinity, disease and strong winds. ![]()
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