Letas downy mildew, lalacewa ta hanyar Bremia lactucae Regel, shine mafi mahimmancin cututtukan foliar na latas (Lactuca sativa L.). Aiwatar da cultivars masu juriya ɗauke da ƙwararrun ƙwayoyin juriya (Gidan Dm) suna taka muhimmiyar rawa a cikin haɗaɗɗen sarrafa cutar mildew; duk da haka, babban sauye-sauye a cikin yawan ƙwayoyin cuta yana haifar da shan kashi na juriya na tsire-tsire da kwayoyin Dm ke bayarwa.
Wasu ciyayi na latas suna nuna juriyar filin da ke bayyana a cikin tsire-tsire masu girma. Yawan jama'a biyu na layin inbred (RILs), waɗanda suka samo asali daga giciye tsakanin filayen jure cultivars Grand Rapids da Iceberg da cultivars Salinas da PI491224, an kimanta don juriyar mildew a ƙarƙashin yanayin filin. Gabaɗaya, 160 RILs daga Iceberg × PI491224 da 88 RILs daga yawan jama'ar Grand Rapids × Salinas an yi amfani da su ta hanyar yin amfani da genotyping ta hanyar jeri, wanda ya haifar da alamomi masu inganci na 906 da 746, bi da bi, waɗanda aka yi amfani da su don ƙididdigar ƙididdigewa (QTL). .
Wannan binciken ya sami QTL a cikin chromosome 4 wanda ke cikin duka Grand Rapids × Salinas da Iceberg × PI491224 yawan mutanen da ke da babban tasiri akan juriyar filin. Sun kuma sami ƙarin ƙarin mahimman QTL guda biyu a cikin chromosomes 2 da 5 a cikin yawan Iceberg × PI491224 RIL. Alamar-taimaka ta hanyar pyramiding na ƙwayoyin Dm da yawa a hade tare da QTLs don juriya na filin suna ba da damar haɓaka cultivars tare da ƙarin juriya ga B. lactucae.
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Gano Manyan Halayen Ƙididdigar Ƙididdigar Loci Mai Sarrafar Juriya Filin zuwa Downy Mildew a cikin Letus ɗin da aka noma (Lactuca sativa)
Lorena Parra, Ivan Simko, da Richard W. Michelmore