小麦苗期水培根系性状QTL定位

Study on the characteristics of wheat root traits at seedling stageThe QTL mapping and genetic basis of wheat root traits at seedling stage were studied. The root architecture of crops was improved in the process of crop breeding, and the water-saving and drought-resistant ability of crops was improved, which provided a theoretical basis for the breeding of water-saving and drought-resistant wheat varieties. In this study, a genetic linkage map was constructed using 2851 high-quality bin markers and a set of wheat recombinant inbred line populations with 173 families. QTL mapping of five root-related traits ( longest root length, total root length, root surface area, root volume, and root average diameter ) in wheat seedlings was performed using the complete interval mapping method. A total of 54 QTLs were detected at the seedling stage, of which the number of QTLs affecting the above five traits was 10,15,6,18, and 6, respectively. The total contribution rates were 42 %, 54 %, 33 %, 62 % and 30 %, respectively. There are some excellent root regulatory sites that have not been found in Gao 8901 wheat varieties. The 7D locus was mapped to two segments, which could affect three traits. It was speculated that there were QTL clusters affecting root traits on this chromosome, and 81 Mb and 412 Mb were QTL segments closely related to root traits.