Igwe ahịhịa na-erughị ala, nke Bremia lactucae Regel kpatara, bụ ọrịa foliar kachasị mkpa akụnụba nke letus (Lactuca sativa L.). Ntinye nke ndi na-eguzogide ọgwụ na-ebu mkpụrụ ndụ ihe nketa (Dm gen) na-arụ ọrụ dị oke mkpa na njikwa ọrịa nchịkwa nke ala; n’agbanyeghi, mgbanwe di elu n’ime onodu ndi n’aru oria gha ebute mmeri nke iguzogide osisi nke ihe omumu ihe omimi Dm nyere.
Fọdụ ụfọdụ letus cultivars na-egosipụta nkwụsi ike nke ubi gosipụtara naanị na osisi ndị okenye. Ndi mmadu abuo nke ahihia ndi ozo (RILs), nke sitere na obe n'etiti ihe ubi na-eguzogide ogwu nke Grand Rapids na Iceberg na ndi nwere ike inweta Salinas na PI491224, ka achoputara maka iguzogide ala nke ala. Na mkpokọta, 160 RILs si Iceberg × PI491224 na 88 RILs sitere na Grand Rapids × Salinas bi na genotyped site na iji genotyping site na usoro, nke mepụtara 906 na 746 akara ngosi dị elu, n'otu n'otu, nke e ji mee ihe maka nyocha njirimara njirimara (QTL) .
Nnyocha a chọtara QTL na chromosome 4 nke dị na Grand Rapids × Salinas na Iceberg × PI491224 ndị nwere mmetụta dị ukwuu na nkwụsi ike nke ubi. Ha chọpụtakwara QTL abụọ dị mkpa na chromosomes 2 na 5 na Iceberg × PI491224 RIL. Ntinye aka na-enye aka na-enye ọtụtụ mkpụrụ ndụ ihe nketa nke Dm na QTL maka nguzogide ubi na-enye ohere iji zụlite ihe ọkụkụ na-eguzogide ike na B. lactucae
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Nchọpụta nke Nnukwu Ọnọdụ itkpụrụ Na-achịkwa eldchịkwa Ala Na-eguzogide Downy Mildew na Lettuce Azụ (Lactuca sativa)
Lorena Parra, Ivan Simko, na Richard W. Michelmore