ʻO ka Lettuce downy mildew, i hoʻokumu ʻia e Bremia lactucae Regel, ʻo ia ka maʻi foliar koʻikoʻi nui o ka letus (Lactuca sativa L.). ʻO ka hoʻoili ʻana o nā mea kanu kūpale e hāpai ana i nā genes resistant dominant (Dm genes) i mea nui i ka mālama ʻia ʻana o ka maʻi ahulau downy; Eia nō naʻe, hiki i ka loli kiʻekiʻe i nā heluna pathogen ke alakaʻi i ka pio o ke kūʻē ʻana o nā mea kanu i hāʻawi ʻia e nā gen Dm.
Hōʻike kekahi mau mea kanu lettuce i ke kūpaʻa kahua i hōʻike wale ʻia i nā mea kanu makua. ʻElua mau heluna o nā laina inbred recombinant (RIL), i hoʻomaka ʻia mai nā keʻa i waena o nā māla kūleʻa ʻo Grand Rapids a me Iceberg a me nā mea kanu maʻalahi ʻo Salinas a me PI491224, i loiloi ʻia no ke kūpaʻa downy ma lalo o nā kūlana kahua. I nā mea āpau, 160 RIL mai ka Iceberg × PI491224 a me 88 RIL mai ka poʻe Grand Rapids × Salinas i genotyped me ka hoʻohana ʻana i ka genotyping ma o ke kaʻina ʻana, a ua hoʻonui ʻia nā kaha kikoʻī 906 a me 746, no kēlā me kēia, i hoʻohana ʻia no ka helu helu locus locit (QTL). .
Ua loaʻa kēia noiʻi i kahi QTL i ka chromosome 4 e kū nei i loko o nā Grand Rapids × Salinas a me Iceberg × PI491224 lehulehu i loaʻa kahi hopena nui i ka kūpaʻa kahua. Ua loaʻa iā lākou ʻelua mau QTL nui hou aʻe i nā chromosome 2 a me 5 i ka heluna Iceberg × PI491224 RIL. ʻO ka pyramiding gene i kōkua ʻia e nā māka o nā gen Dm he nui me ka QTLs no ke kūpaʻa kahua e hāʻawi i ka manawa kūpono e hoʻomohala i nā mea kanu me ke kūpaʻa kūpaʻa mau loa iā B. lactucae.
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Kaʻike o ka nui o ke ʻano nui Loci ke kāohi nei i ke kūʻē ʻana i ka māla iā Downy Mildew i ka Lettuce i mahi ʻia (Lactuca sativa)
ʻO Lorena Parra, ʻo ʻIvan Simko, a ʻo Richard W. Michelmore