|KHERA, PAWAN - University Of Georgia|
|WANG, HUI - University Of Georgia|
|CULBREATH, ALBERT - University Of Georgia|
|PANDEY, MANISH - International Crops Research Institute For Semi-Arid Tropics (ICRISAT) - India|
|VARSHEY, RAEEV - International Crops Research Institute For Semi-Arid Tropics (ICRISAT) - India|
|BERTIOLI, DAVID - University Of Brazil|
|WANG, XINGJUN - Genome Sequencing Center|
|LIAO, BOSHOU - Genome Sequencing Center|
|ZHANG, XINYOU - Genome Sequencing Center|
|Holbrook, Carl - Corley|
Submitted to: Meeting Abstract
Publication Type: Abstract Only
Publication Acceptance Date: 11/9/2015
Publication Date: 11/10/2015
Citation: Guo, B., Khera, P., Wang, H., Culbreath, A.K., Pandey, M.K., Varshey, R.K., Bertioli, D.J., Wang, X., Liao, B., Zhang, X., Holbrook Jr, C.C. 2015. Progress on genetic linkage maps, traits/QTLs, and utilization in two recombinant inbred line populations of peanuts (Arachis hypogaea L.). Meeting Abstract. Advances in Arachis through Genomics and Biotechnology (AAGB) meeting, November 10-14, 2014, Savannah, Georgia.
Technical Abstract: Peanut, a highly nutritional crop, is used in edible products or crushed for cooking oil, and is susceptible to a range of diseases, including Tomato spotted wilt virus (TSWV), early and late leaf spot (ELS and LLS). Losses in productivity and quality are also attributable to environmental stresses and food safety issues. A promising solution is the use of quantitative trait loci (QTL) mapping of disease resistance and other agronomic traits for use in cultivar development. Two recombinant inbred line (RIL) populations have been developed for genetic mapping and QTL study, one derived from the cross SunOleic 97R × NC94022 (referred as S-population) and another from Tifrunner × GT-C20 (referred as T-population) with 352 and 248 individuals, respectively. These two populations were used in QTL analysis for oil quality including total oil content and fatty acid composition, disease resistance including TSWV, ELS and LLS, and other traits from 2009 to 2013. The first generation maps were developed with 172 and 239 marker loci and two QTLs were identified for TSWV resistance with 36% and 13% phenotypic variance explained (PVE) for the S and T population, respectively. The second generation maps were constructed with 206 and 377 marker loci. Major QTLs were identified for oil content and eight fatty acid compositions. These maps were further saturated and the current third generation maps contain 248 and 426 marker loci. Disease resistance QTL regions with high PVE were identified for ELS, LLS and TSWV resistance. Interestingly, several gene-rich linkage groups have been identified and used for comparison with diploid pseudomolecules in order to identify specific genes and “gene-rich” chromosomes. Furthermore, sequence data for 141 and 118 RILs from the S and T population are being generated under the international peanut genome sequencing project, respectively.