Lettuce downy mildew, tshwm sim los ntawm Bremia lactucae Regel, yog tus kab mob tseem ceeb tshaj plaws ntawm cov kab mob lettuce (Lactuca sativa L.). Kev xa tawm ntawm cov cultivars resistant nqa cov tseem ceeb tsis kam genes (Dm genes) plays lub luag haujlwm tseem ceeb hauv kev tswj kab mob downy mildew; Txawm li cas los xij, kev hloov pauv siab hauv cov kab mob ua rau muaj kev cuam tshuam ntawm cov nroj tsuag tsis kam lees los ntawm Dm noob.
Qee cov lettuce cultivars nthuav tawm teb tsis kam uas tsuas yog tshwm sim hauv cov neeg laus cov nroj tsuag. Ob haiv neeg ntawm cov kab sib txuas ua ke (RILs), pib los ntawm kev hla nruab nrab ntawm thaj teb resistant cultivars Grand Rapids thiab Iceberg thiab susceptible cultivars Salinas thiab PI491224, tau soj ntsuam rau downy mildew kuj nyob rau hauv tej yam kev mob. Nyob rau hauv tag nrho, 160 RILs los ntawm Iceberg × PI491224 thiab 88 RILs los ntawm Grand Rapids × Salinas cov pej xeem tau genotyped siv genotyping los ntawm sequencing, uas generated 906 thiab 746 high-quality markers, raws li, uas tau siv rau quantitative TL) tsom xam locus .
Txoj kev tshawb no pom ib QTL hauv chromosome 4 uas muaj nyob rau hauv ob qho tib si Grand Rapids × Salinas thiab Iceberg × PI491224 cov pej xeem uas muaj kev cuam tshuam loj rau kev tiv thaiv teb. Lawv kuj pom ob qho tseem ceeb ntxiv QTLs hauv chromosomes 2 thiab 5 hauv Iceberg × PI491224 RIL cov pej xeem. Marker-pab noob pyramiding ntawm ntau Dm noob nyob rau hauv ua ke nrog nrog QTLs rau teb kuj muab lub sij hawm los tsim cultivars nrog ntau ruaj tsis kam mus rau B. lactucae.
Nyeem qhov kev tshawb fawb tiav ntawm www.apsjournals.apsnet.org.
Kev txheeb xyuas qhov tseem ceeb ntawm Qhov Loj Loj Loci Tswj Field Resistance rau Downy Mildew hauv Cultivated Lettuce (Lactuca sativa)
Lorena Parra, Ivan Simko, thiab Richard W. Michelmore