Peanut root-knot nematode

Page Contributors: 
PeanutBase (Sudhansu Dash)
Major Information Sources: 

Y. Chu, C. L. Wu, C. C. Holbrook, B. L. Tillman, G. Person, and P. Ozias-Akins. Marker-Assisted Selection to Pyramid Nematode Resistance and the High Oleic Trait in Peanut. THE PLANT GENOME (2011) 4(2):110-117

GM565   ♦ CAPS marker 1169/1170  ♦ S197  

Backgrpound 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 peanutrelative), 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:

Markers for MAS: 
GM565 CAPS marker 1169/1170 S197

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

CAPS marker 1169/1170 S197
Source of resistance
Cultivar Tifguard

Known susceptible lines
Georgia-02C and Florida-07
Georgia-02C and Florida-07