Peanut root-knot nematode

Trait Symbol:

Page Contributors: PeanutBase (Sudhansu Dash)

Major Information Sources:


• GM565 • CAPS marker 1169/1170 • S197

Background Information: Meloidogyne arenaria, Chitwood race 1 (rootknot nematode [RKN]), damage to peanut roots and pods causes significant economic loss in infested fields. A gene for nematode resistance, Rma (resistance to M. arenaria), from Arachis cardenasii (a wild peanut relative), has been introgressed into cultivated peanut through either interspecific hybridization involving a synthetic tetraploid (Arachis batizocoi × [A.cardenasii × Arachis diogoi]) crossed with A. hypogaea or a hexaploid introgression pathway (A. hypogaea × A. cardenasii). The synthetic tetraploid approach, using ‘Florunner’ as the recurrent female parent to introgress Rma, has yielded the resistant cultivars COAN and Nema-TAM. The introgressed region carrying Rma has been found to be collinear with a portion of chromosome 9A and is shared with Tifguard, a high-yielding elite cultivar with near immunity to RKN and high resistance to tomato spotted wilt virus (TSWV).

Trait Details: Reaction to Meloidogyne arenaria damage and the QTL symbol is "Peanut root-knot nematode".

 

Image source:
http://www.plantmanagementnetwork.org/pub/php/management/rootknot/
http://oziasakinslab.org/projects/plant-biotechnology-peanut-grasses/marker-assisted-selection-for-nematod-resistance-in-peanut/

Markers for MAS:

Marker GM565 CAPS marker 1169/1170 S197
Source
Comments
Type
Repeat
Forward primer
Reverse primer
Size (bp) in susceptible lines
Size (bp) in resistant lines

Primers and PCR products of the markers:
(from the primary citation)

Links: