Genetic analysis of stilbenoid profiles in grapevine stems reveals a major mQTL hotspot on chromosome 18 associated with disease-resistance motifs  

作　　者：Soon L.Teh Bety Rostandy Mani Awale James J.Luby Anne Fennell Adrian D.Hegeman 

机构地区：[1]Department of Horticultural Science,University of Minnesota,Saint Paul,MN 55108,USA [2]Agronomy,Horticulture and Plant Science Department,South Dakota State University,Brookings,SD 57007,USA [3]Tree Fruit Research and Extension Center,Department of Horticulture,Washington State University,Wenatchee,WA 98801,USA [4]Department of Mathematics and Statistics,University of North Carolina,Greensboro,NC 27412,USA [5]Grape and Wine Institute,University of Missouri,Columbia,MO 65211,USA

出　　处：《Horticulture Research》2019年第1期195-205,共11页园艺研究（英文）

基　　金：Funding for this research was provided by the USDA-NIFA Specialty Crops Research Initiative(Award Nos 2011-51181-30635 and 2011-51181-30850)through the VitisGen project and the Northern Grapes Project,as well as by the Minnesota Agricultural Experiment Station and the South Dakota Agricultural Experiment Station through the Hatch projects;Funding was also provided by the National Science Foundation IOS(Award No.1238812).

摘　　要：Grapevine(Vitis spp.)contains a wealth of phytochemicals that have received considerable attention due to healthpromoting properties and biological activities as phytoalexins.To date,the genetic basis of the quantitative variations for these potentially beneficial compounds has been limited.Here,metabolic quantitative trait locus(mQTL)mapping was conducted using grapevine stems of a segregating F2 population.Metabolic profiling of grapevine stems was performed using liquid chromatography–high-resolution mass spectrometry(LC-HRMS),resulting in the detection of 1317 ions/features.In total,19 of these features matched with literature-reported stilbenoid masses and were genetically mapped using a 1449-SNP linkage map and R/qtl software,resulting in the identification of four mQTLs.Two large-effect mQTLs that corresponded to a stilbenoid dimer and a trimer were mapped on chromosome 18,accounting for phenotypic variances of 29.0%and 38.4%.Functional annotations of these large-effect mQTLs on the VitisNet network database revealed a major hotspot of disease-resistance motifs on chromosome 18.This 2.8-Mbp region contains 48 genes with R-gene motifs,including variants of TIR,NBS,and LRR,that might potentially confer resistance to powdery mildew,downy mildew,or other pathogens.The locus also encompasses genes associated with flavonoid and biosynthetic pathways that are likely involved in the production of secondary metabolites,including phytoalexins.In addition,haplotype dosage effects of the five mQTLs further characterized the genomic regions for differential production of stilbenoids that can be applied in resistance breeding through manipulation of stilbenoid production in planta.

关 键 词：dosage linkage breeding 

分 类 号：F42[经济管理—产业经济]