Association analysis of resistance to cereal cyst nematodes (Heterodera avenae) and root lesion nematodes (Pratylenchus neglectusandP. thornei) in CIMMYT advanced spring wheat lines for semi-arid conditions.
To identify loci linked to nematode resistance genes, a total of 126 of CIMMYT advanced spring wheat lines adapted to semi-arid conditions were screened for resistance toHeterodera avenae,Pratylenchus neglectus, andP. thornei, of which 107 lines were genotyped with 1,310 DArT. Association of DArT markers with nematode response was analyzed using the general linear model. Results showed that 11 markers were associated with resistance toH. avenae(pathotype Ha21), 25 markers with resistance toP. neglectus, and 9 significant markers were identified to be linked with resistance toP. thornei. In this work we confirmed that chromosome 4A (~90-105 cM) can be a source of resistance toP. thorneias has been recently reported. Other significant markers were also identified on chromosomal regions where no resistant genes have been reported for both nematodes species. These novel QTL were mapped to chromosomes 5A, 6A, and 7A forH. avenae; on chromosomes 1A, 1B, 3A, 3B, 6B, 7AS, and 7D forP. neglectus; and on chromosomes 1D, 2A, and 5B forP. thorneiand represent potentially new loci linked to resistance that may be useful for selecting parents and deploying resistance into elite germplasm adapted to regions where nematodes are causing problem.
International Maize and Wheat Improvement Center (CIMMYT) , P.K. 39 Emek, 06511 Ankara , Turkey.
Abdelfattah A
AA
Dababat
International Maize and Wheat Improvement Center (CIMMYT) , Mexico.
Gomez-Becerra Hugo
GH
Ferney
International Maize and Wheat Improvement Center (CIMMYT) , P.K. 39 Emek, 06511 Ankara , Turkey.
Gul
G
Erginbas-Orakci
International Maize and Wheat Improvement Center (CIMMYT) , Mexico.
Susanne
S
Dreisigacker
Department of Plant Protection, Faculty of Agriculture and Natural Sciences, University of Abant Izzet Baysal , Bolu , Turkey.
Mustafa
M
Imren
Department of Plant Production and Technologies, Faculty of Agricultural Sciences and Technologies, University of Nigde , Nigde , Turkey.
Halil
H
Toktay
Cukurova University , Adana , Turkey.
Halil I
HI
Elekcioglu
Department of Entomology and Nematology, University of Florida , Florida , USA.
Tesfamariam
T
Mekete
International Maize and Wheat Improvement Center (CIMMYT) , P.K. 39 Emek, 06511 Ankara , Turkey.
Julie M
JM
Nicol
Grains Research & Development Corporation (GRDC) , 4/4 National Circuit Barton 2600 ACT , Australia.
Omid
O
Ansari
Grains Research & Development Corporation (GRDC) , 4/4 National Circuit Barton 2600 ACT , Australia.
Francis
F
Ogbonnaya
DArT; QTL; association mapping; bread wheat; cereal cyst nematode; root lesion nematode