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A QTL associated with leaf trichome traits has a major influence on the abundance of the predatory mite Typhlodromus pyri in a hybrid grapevine population

查看全文 作　　者：Paola [1,4]Barba;Rebecca [1]Loughner;Karen [2]Wentworth;Jan Peter [2]Nyrop;Gregory [2]M.Loeb;Bruce [3]I.Reisch 高影响力作者 机构地区：[1]Plant Breeding and Genetics Section,School of Integrative Plant Science,Cornell University,Ithaca,NY 14853,USA;[2]Department of Entomology,Cornell AgriTech,Geneva,NY 14456,USA;[3]Horticulture Section,School of Integrative Plant Science,Cornell AgriTech,Geneva,NY 14456,USA;[4]Instituto de Investigaciones Agropecuarias,INIA La Platina,Santiago 8831314,Chile高影响力机构 出　　处：《Horticulture Research》索引2019年第6卷第1期,共12页高影响力期刊 基　　金：supported by the Specialty Crop Research Initiative of the National Institute of Food and Agriculture,U.S.Department of Agriculture,under award number 2011-51181-30635 and National Research Initiative award number 2004-35302-14725. 摘　　要：The abundance of predatory phytoseiid mites,Typhlodromus pyri,important biological control agents of spider mite pests in numerous crops,is positively influenced by the density of leaf trichomes and tuft-form domatia in vein axils.Identification of the genetic regions controlling both trophic levels could facilitate the improvement of predatory mite habitat in breeding programs.The abundance of T.pyri and non-glandular trichomes was measured in a segregating F1 family derived from the cross of the complex Vitis hybrid,‘Horizon’,with Illinois 547-1(V.rupestris B38×V.cinerea B9),finding positive correlation among traits.High density genetic maps were used to localize one major quantitative trait locus(QTL)on chromosome 1 of Illinois 547-1 associated with both predatory mite abundance and leaf trichomes.This QTL explained 23%of the variation in phytoseiid abundance and similar amounts of variance in domatia rating(21%),domatia size(16%),leaf bristle density(37%in veins and 33%in blades),and leaf hair density(20%in veins and 15%in blades).Another nine QTL distributed among chromosomes 1,2,5,8,and 15 were associated solely with trichome density,and explained 7–17%of the phenotypic variation.Combined,our results provide evidence of the genetic architecture of non-glandular trichomes in Vitis,with a major locus influencing trichome densities,domatia size and predatory mite abundance.This information is relevant for breeding grapevines with a more favorable habitat for biological control agents. 关 键 词：breeding CROPS PREDATOR
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