Fine mapping of root lesion nematode (Pratylenchus thornei) resistance loci on chromosomes 6D and 2B of wheat

2019 ◽  
Vol 133 (2) ◽  
pp. 635-652 ◽  
Author(s):  
Muhammad Shefatur Rahman ◽  
Katherine J. Linsell ◽  
Julian D. Taylor ◽  
Matthew J. Hayden ◽  
Nicholas C. Collins ◽  
...  
Keyword(s):  
Fine Mapping ◽  
Root Lesion Nematode ◽  
Pratylenchus Thornei ◽  
Lesion Nematode

Metabolomic profiling of wheat genotypes resistant and susceptible to root-lesion nematode Pratylenchus thornei

2021 ◽  
Author(s):  
Md Motiur Rahaman ◽  
Rebecca S. Zwart ◽  
Thusitha W. T. Rupasinghe ◽  
Helen L. Hayden ◽  
John P. Thompson
Keyword(s):  
Root Lesion Nematode ◽  
Wheat Genotypes ◽  
Metabolomic Profiling ◽  
Pratylenchus Thornei ◽  
Lesion Nematode

Genetic analysis of resistance to root-lesion nematode (Pratylenchus thornei) in wheat

2004 ◽  
Vol 123 (3) ◽  
pp. 209-212 ◽  
Author(s):  
R. S. Zwart ◽  
J. P. Thompson ◽  
I. D. Godwin
Keyword(s):  
Genetic Analysis ◽  
Root Lesion Nematode ◽  
Pratylenchus Thornei ◽  
Lesion Nematode

A triumph of tolerance: managing the threat to wheat production by the root lesion nematode Pratylenchus thornei in the subtropical grain region of eastern Australia.

2021 ◽  
pp. 13-19
Author(s):  
Kirsty Owen
Keyword(s):  
Management Practices ◽  
Resistance Breeding ◽  
Nematode Resistance ◽  
Future Research ◽  
Root Lesion Nematode ◽  
Wheat Production ◽  
Production Region ◽  
Pratylenchus Thornei ◽  
Eastern Australia ◽  
Lesion Nematode

Abstract This chapter provides information on the economic importance, host range, geographical distribution, damage symptoms, biology and life cycle and interactions with other nematodes and pathogens of the root lesion nematode, Pratylenchus thornei, a severe and widespread threat to wheat production in the subtropical grain production region of eastern Australia. Some recommended integrated nematode management practices and future research for nematode resistance breeding are also presented.

Root-lesion nematode (Pratylenchus thornei) limits response of wheat but not barley to stored soil moisture in the Hermitage long-term tillage experiment

1995 ◽  
Vol 35 (7) ◽  
pp. 1049 ◽  
Author(s):  
JP Thompson ◽  
J Mackenzie ◽  
R Amos
Keyword(s):  
Maximum Yield ◽  
No Tillage ◽  
Root Lesion Nematode ◽  
Wheat Varieties ◽  
Stubble Retention ◽  
Pratylenchus Thornei ◽  
Lesion Nematodes ◽  
Lesion Nematode ◽  
Root Lesion Nematodes

The cumulative effects of factorial treatments of tillage (no tillage, conventional), stubble retention (burnt, retained), and nitrogen fertiliser (0, 23, 69 kg N/ha) on yield of continuous winter cereals and on soil properties have been tested in the Hermitage fallow management experiment since 1969. Despite increased soil water stored from the combination of no tillage and stubble retention, wheat responses to the extra water were disappointing in the first 11 years of the experiment. Soil samples from the experiment were shown to be heavily infested with the root-lesion nematode (Pratylenchus thornei Sher and Allen), and therefore in 1980, the main plots were split for crop (wheat cv. Timgalen, barley cv. Clipper) and nematicide treatment (nil, aldicarb). Barley (maximum yield 3.2 t/ha) tolerated the nematodes and responded in this dry year to the extra stored water accumulated with no tillage and stubble retention, but wheat (maximum yield 1.22 t/ha) did not. Nematicide increased wheat yields by 42%. The results from the changes to the Hermitage experiment in 1980 show the importance of considering root-lesion nematodes in interpreting results from long-term experiments involving wheat and in applying those results to farms. Control of root-lesion nematodes on farms by crop rotation and by growing tolerant and resistant wheat varieties is needed to obtain full yield benefits from improved tillage practices.

scholarly journals Interactions of Pratylenchus thornei and Fusarium oxysporum f. sp. ciceris on Chickpea

1998 ◽  
Vol 88 (8) ◽  
pp. 828-836 ◽  
Author(s):  
Pablo Castillo ◽  
María P. Mora-Rodríguez ◽  
Juan A. Navas-Cortés ◽  
Rafael M. Jiménez-Díaz
Keyword(s):  
Fusarium Oxysporum ◽  
Fusarium Wilt ◽  
Field Conditions ◽  
Root Lesion Nematode ◽  
Root Infection ◽  
Experimental Conditions ◽  
Nematode Reproduction ◽  
Pratylenchus Thornei ◽  
Root Necrosis ◽  
Lesion Nematode

Fusarium oxysporum f. sp. ciceris and the root-lesion nematode Pratylenchus thornei coinfect chickpeas in southern Spain. The influence of root infection by P. thornei on the reaction of Fusarium wilt-susceptible (CPS 1 and PV 61) and wilt-resistant (UC 27) chickpea cultivars to F. oxysporum f. sp. ciceris race 5 was investigated under controlled and field conditions. Severity of Fusarium wilt was not modified by coinfection of chickpeas by P. thornei and F. oxysporum f. sp. ciceris, in simultaneous or sequential inoculations with the pathogens. Root infection with five nematodes per cm3 of soil and 5,000 chlamydospores per g of soil of the fungus resulted in significantly higher numbers of propagules of F. oxysporum f. sp. ciceris with the wilt-susceptible cultivar CPS 1, but not with the wilt-resistant one. However, infection with 10 nematodes per cm3 of soil significantly increased root infection by F. oxysporum f. sp. ciceris in both cultivars, irrespective of fungal inoculum densities (250 to 2,000 chlamydospores per g of soil). Plant growth was significantly reduced by P. thornei infection on wilt-susceptible and wilt-resistant chickpeas in controlled and field conditions, except when shorter periods of incubation (45 days after inoculation) were used under controlled conditions. Severity of root necrosis was greater in wilt-susceptible and wilt-resistant cultivars when nematodes were present in the root, irrespective of length of incubation time (45 to 90 days), densities of nematodes (5 and 10 nematodes per cm3 of soil), fungal inocula, and experimental conditions. Nematode reproduction on the wilt-susceptible cultivars, but not on the wilt-resistant one, was significantly increased by F. oxysporum f. sp. ciceris infections under controlled and field conditions.

scholarly journals Identification of quantitative trait loci for resistance to two species of root-lesion nematode (Pratylenchus thornei and P. neglectus) in wheat

2005 ◽  
Vol 56 (4) ◽  
pp. 345 ◽  
Author(s):  
R. S. Zwart ◽  
J. P. Thompson ◽  
I. D. Godwin
Keyword(s):  
Quantitative Trait Loci ◽  
Microsatellite Markers ◽  
Phenotypic Variation ◽  
Quantitative Trait ◽  
Nematode Resistance ◽  
Root Lesion Nematode ◽  
Pratylenchus Thornei ◽  
Lesion Nematode ◽  
Chromosome Regions ◽  
Major Qtl

Pratylenchus thornei and P. neglectus are two species of root-lesion nematode that cause substantial yield losses in wheat. No commercially available wheat variety has resistance to both species. A doubled-haploid population developed from a cross between the synthetic hexaploid wheat line CPI133872 and the bread wheat Janz was used to locate and tag quantitative trait loci (QTLs) associated with resistance to both P. thornei and P. neglectus. Wheat plants were inoculated with both species of nematode in independent replicated glasshouse trials repeated over 2 years. Known locations of wheat microsatellite markers were used to construct a framework map. After an initial single-marker analysis to detect marker-trait linkages, chromosome regions associated with putative QTLs were targetted with microsatellite markers to increase map density in the chromosome regions of interest. In total, 148 wheat microsatellite markers and 21 amplified fragment length polymorphism markers were mapped. The codominant microsatellite marker Xbarc183 on the distal end of chromosome 6DS was allelic for resistance to both P. thornei and P. neglectus. The QTL were designated QRlnt.lrc-6D.1 and QRlnn.lrc-6D.1, for the 2 traits, respectively. The allele inherited from CPI133872 explained 22.0–24.2% of the phenotypic variation for P. thornei resistance, and the allele inherited from Janz accounted for 11.3–14.0% of the phenotypic variation for P. neglectus resistance. Composite interval mapping identified markers that flank a second major QTL on chromosome 6DL (QRlnt.lrc-6D.2) that explained 8.3–13.4% of the phenotypic variation for P. thornei resistance. An additional major QTL associated with P. neglectus resistance was detected on chromosome 4DS (QRlnn.lrc-4D.1) and explained a further 10.3–15.4% of the phenotypic variation. The identification and tagging of nematode resistance genes with molecular markers will allow appropriate allele combinations to be selected, which will aid the successful breeding of wheat with dual nematode resistance.

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