Meloidogyne incognita nematode resistance QTL in carrot

作者：Parsons Joshua; Matthews William; Iorizzo Massimo; Roberts Philip; Simon Philipp^*

来源：Molecular Breeding, 2015, 35(5): 114.

DOI：10.1007/s11032-015-0309-2

• Carrot
• Root-knot nematodes
• QTL
• Disease resistance
• Daucus carota L.

Root-knot nematodes (Meloidogyne spp.) are major pests attacking carrots (Daucus carota) worldwide, causing galling and forking of the storage roots, rendering them unacceptable for market. Genetic resistance could significantly reduce the need for broad-spectrum soil fumigants in carrot production. In this study, genetic resistance to Meloidogyne incognita was mapped. Three diverse sources of resistance, from Syria (HM), Europe (SFF) and South America (Br1091), were identified. Two F-2 mapping populations were developed using these parents, (Br1091 x HM1) and (SFF x HM2), as well as a segregating population derived from the self-pollination of a HM plant (HM3). Analysis revealed four QTLs conditioning resistance in Br1091 x HM1, three in SFF x HM2, and three in HM3. A consensus genetic map of the three populations revealed five non-overlapping QTLs for M. incognita resistance, one each on carrot chromosomes 1, 2, 4, 8, and 9. One QTL was present in all three populations, in the same region of chromosome 8 as Mj-1 which imparts resistance to M. javanica.

• 出版日期2015-5