Lettuce downy mildew, inokonzereswa neBremia lactucae Regel, ndicho chirwere chefoliar chakakosha zvikuru chelettuce (Lactuca sativa L.). Kuiswa kwembesa dzisingachinji dzakatakura majene ekusagadzikana (Dm genes) kunoita basa rakakosha mukuronga kwechirwere che downy mildew; zvisinei, kusiyana kwepamusoro muhuwandu hwepathogen kunotungamirira kukukundwa kwekudyara kwemiti kunopiwa neDm gene.
Mimwe lettuce cultivars inoratidza kupikisa kwemumunda kunongoratidzwa muzvirimwa zvevakuru. Zviverengero zviviri zvemitsetse yakasanganiswa (RILs), zvichibva pamichinjikwa pakati peminda isingarambiki cultivars Grand Rapids ne Iceberg uye cultivars hutapukidzwa Salinas uye PI491224, akaongororwa kuti downy mildew kuramba mumamiriro ezvinhu emumunda. Pakati pese, zana nemakumi matanhatu RILs kubva kuIceberg × PI160 uye 491224 RILs kubva kuGrand Rapids × Salinas vanhu vakaiswa genotyped vachishandisa genotyping nekutevedzana, iyo yakagadzira 88 uye 906 emhando yepamusoro mamaki, zvichiteerana, ayo akashandiswa pahuwandu hwemaitiro ekuongorora (QTL) .
Chidzidzo ichi chakawana QTL mukromozomu 4 iripo mune zvese Grand Rapids × Salinas uye Iceberg × PI491224 vanhu vane simba guru pakuramba munda. Vakawanawo mamwe maviri akakosha maQTL mumakromosomes 2 uye 5 muIceberg × PI491224 RIL huwandu. Marker-assisted gene pyramiding of multiple Dm genes pamwe chete neQTLs for field resistance zvinopa mukana wekugadzira cultivars dzinoramba dzakasimba B. lactucae.
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Kuzivikanwa kweMakuru Quantitative Trait Loci Kudzora Munda Resistance kune Downy Mildew mune Yakarimwa Lettuce (Lactuca sativa)
Lorena Parra, Ivan Simko, uye Richard W. Michelmore