Lettuce downy hlobo, e bakoang ke Bremia lactucae Regel, ke lefu la foliar la bohlokoahali moruong la lettuce (Lactuca sativa L.). Ho tsamaisoa ha lijalo tse sa thibeleng tse jereng liphatsa tsa lefutso tse matlafatsang (Dm genes) ho bapala karolo ea bohlokoa ho tsamaisaneng le taolo ea mafu a hlobo; leha ho le joalo, ho se tšoane ho hoholo hoa bongata ba likokoana-hloko ho lebisa ho hloloeng ha khanyetso ea limela e fanoang ke liphatsa tsa lefutso tsa Dm.
Mefuta e meng ea limela tsa lettuce e bontša ho hanyetsa masimong ho bonahalang feela ho limela tsa batho ba baholo. Mefuta e 'meli ea mela e kenngoang kahare e kopantsoeng (RILs), e tsoang lifapano lipakeng tsa lijalo tse hananang le tšimo Grand Rapids le Iceberg le lijalo tse hlaseloang habonolo tsa Salinas le PI491224, li ile tsa hlahlojoa bakeng sa ho itoanela ha phoka tlas'a maemo a tšimo. Ka kakaretso, li-RIL tse 160 tse tsoang Iceberg × PI491224 le li-RIL tse 88 tse tsoang Grand Rapids × Salinas li ne li fuoe li-genotyping ka tatellano, e hlahisitseng lipalo tsa boleng bo holimo tsa 906 le 746, ka tatellano, tse neng li sebelisetsoa tlhahlobo ea "trait locit" (QTL) ea bongata. .
Phuputso ena e fumane QTL ka chromosome 4 e teng ho Grand Rapids × Salinas le Iceberg × PI491224 e nang le tšusumetso e kholo ho haneleng tšimo. Ba boetse ba fumane li-QTL tse ling tsa bohlokoa ho li-chromosomes 2 le 5 ho baahi ba Iceberg × PI491224 RIL. Phiramide ea liphatsa tsa lefutso e thusitsoeng ke "mark" ea liphatsa tsa lefutso tse ngata tsa Dm hammoho le li-QTL bakeng sa ts'ireletso ea tšimo li fana ka monyetla oa ho hlahisa lijalo tse nang le khanyetso e tšoarellang ho B. lactucae.
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Ho Khetholla Tloaelo e Kholo ea Tloaelo ea Tikoloho e Laolang Khanyetso ea Tšimo ho Downy Mildew ka Lettuce e Lemiloeng (Lactuca sativa)
Lorena Parra, Ivan Simko, le Richard W. Michelmore