The distribution, pathogenicity and ecology ofPratylenchus Thornei in the northern negev

Orion, D.; Krikun, J.; Sullami, Meira

doi:10.1007/bf02980429

Cited by 11 publications

(10 citation statements)

References 2 publications

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“…Many of the R wild relatives identified in this research, particularly A. speltoides, T. monococcum, T. urartu and T. dicoccoides, originated from the countries occupying the Levantine coast of the eastern Mediterranean where P. thornei is endemic (Di Vito et al 1994;Greco et al 1988;Orion et al 1979). This supports the notion that germplasm collections selected from areas where a disease is endemic are more likely to contain R accessions.…”

Section: Discussionsupporting

confidence: 79%

“…Pratylenchus thornei is endemic to the region of the Middle East (Di Vito et al 1994;Greco et al 1988;Orion et al 1979;Pourjam et al 1999) where modern wheat and its progenitors have evolved (Feldman and Sears 1981). Much of the diversity among plant species is believed to reflect natural selection imposed by biotic stress, causing the evolution of a new resistance character that reduces pathogen attack (Rausher 2001).…”

Section: Introductionmentioning

confidence: 97%

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Diploid and tetraploid progenitors of wheat are valuable sources of resistance to the root lesion nematode Pratylenchus thornei

2012

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The root lesion nematode Pratylenchus thornei is widely distributed in Australian wheat (Triticum aestivum) producing regions and can reduce yield by more than 50%, costing the industry AU$50 M/year. Genetic resistance is the most effective form of management but no commercial cultivars are resistant (R) and the best parental lines are only moderately R. The wild relatives of wheat have evolved in P. thornei-infested soil for millennia and may have superior levels of resistance that can be transferred to commercial wheats. To evaluate this hypothesis, a collection of 251 accessions of wheat and related species was tested for resistance to P. thornei under controlled conditions in glasshouse pot experiments over two consecutive years. Diploid accessions were more R than tetraploid accessions which proved more R than hexaploid accessions. Of the diploid accessions, 11 (52%) Aegilops speltoides (S-[B]-genome), 10 (43%) Triticum monococcum (A m -genome) and 5 (24%) Triticum urartu (A u -genome) accessions were R. One tetraploid accession (Triticum dicoccoides) was R. This establishes for the first time that P. thornei resistance is located on the A-genome and confirms resistance on the B-genome. Since previous research has shown that the moderate levels of P. thornei resistance in hexaploid wheat are dose-dependent, additive and located on the B and D-genomes, it would seem efficient to target A-genome resistance for introduction to hexaploid lines through direct crossing, using durum wheat as a bridging species and/or through the development of amphiploids. This would allow resistances from each genome to be combined to generate a higher level of resistance than is currently available in hexaploid wheat.

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Section: Discussionsupporting

confidence: 79%

Section: Introductionmentioning

confidence: 97%

Diploid and tetraploid progenitors of wheat are valuable sources of resistance to the root lesion nematode Pratylenchus thornei

2012

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“…Many species and cultivars within the Fabaceae have been reported as hosts of P. neglectus and P. thornei (3). Alfalfa and common vetch were reported as hosts of P. thornei (6,14,21). Vanstone et al (50) considered vetch as being susceptible to P. thornei and resistant to moderately resistant to P. neglectus.…”

Section: Discussionmentioning

confidence: 97%

Selected Pacific Northwest Rangeland and Weed Plants as Hosts of Pratylenchus neglectus and P. thornei

Smiley

Yan²,

Gourlie

2014

Plant Disease

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Smiley, R. W., Yan, G. P., and Gourlie, J. A. 2014. Selected Pacific Northwest rangeland and weed plants as hosts of Pratylenchus neglectus and P. thornei. Plant Dis. 98:1333-1340.Eighteen rangeland plants and 16 weed species were assayed in the greenhouse for efficiency as hosts of Pratylenchus neglectus and P. thornei. Hosting ability ratings were assigned using the ratio of final versus initial nematode density and by comparing the final nematode density to that of susceptible wheat controls. Good hosts of both Pratylenchus spp. included thickspike bluegrass 'Critana', smooth brome 'Manchar', seven wheatgrasses, and jointed goatgrass. Good hosts of P. neglectus but not P. thornei included two hairy vetches, western wheatgrass 'Rosana', big bluegrass 'Sherman', tall wheatgrass 'Alkar', green foxtail, kochia, large crabgrass, palmer amaranth, redroot pigweed, tumble mustard, and wild oat. Good hosts of P. thornei but not P. neglectus included hard fescue 'Durar', sheep fescue 'Blacksheep', downy brome, and rattail fescue. Poor or minor hosts of both Pratylenchus spp. included two alfalfas, dandelion, horseweed, lambsquarters, prostrate spurge, and Russian thistle. These assays will provide guidance for transitioning rangeland into crop production and for understanding the role of weeds on densities of Pratylenchus spp. in wheat-production systems.Agricultural fields in low-precipitation regions of the Pacific Northwest (PNW; southern Idaho, eastern Oregon, and eastern Washington) are frequently infested by one or more species of Pratylenchus (12,31,38). Approximately 90% of rainfed production systems are infested by P. neglectus (Rensch) Filipjev Schuurmanns & Stekhoven, by P. thornei Sher & Allen, or by mixtures of these two species. The occurrence of P. thornei is more geographically restricted than for P. neglectus. Yields of rainfed wheat (Triticum aestivum L.) in low-precipitation environments (<400 mm annually) are often inversely correlated with preplant densities of these nematodes (29,35,36). Both species have reduced grain yields by as much as 60% in PNW rainfed wheat (29,35,36) and are estimated to reduce profitability of wheat production in the PNW by at least $51 million annually (28).More than one million hectares of former wheat-producing land on 10,321 farms in Idaho, Oregon, and Washington are currently maintained under contracts to the USDA Natural Resource Conservation Service's Conservation Reserve Program (USDA-NRCS-CRP) (46). Ten-year CRP contracts require the planting of mixtures of three to five native grasses and one or more forbs or legumes adapted to local environments and best suited to wildlife in that area. Species and cultivars meeting the minimal requirement are specified in the contract. Upon expiration of a contract, the producer may continue to maintain the land as rangeland without federal funding, return the land to crop production, or negotiate another CRP contract. Land retired from a CRP contract in the inland PNW is mostly returned immediately to wheat production. In the ...

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“…Pea and lentil were hosts of P. thornei in Syria (12), and pea was a minor host of P. thornei in Israel (25). Pea and lentil are hosts of both P. neglectus and P. thornei in the PNW (31), but nearly all of the numerous pea and lentil cultivars tested in Australia were resistant to each of these Pratylenchus spp.…”

Section: Discussionmentioning

confidence: 99%

“…High densities of P. neglectus have also been detected following production of cruciferous crops (Brassicaceae family) in the PNW (40,42,44,46), but documentation of specific hosting abilities of these crops is lacking. The traditional rotation of food legumes with cereals is not recommended in fields infested by P. thornei in the Mediterranean Basin because this nematode multiplied efficiently on lentil, pea, and other leguminous crops in those regions (12,25). However, in Australia, most cultivars of lentil and pea are considered resistant or moderately resistant to both P. neglectus and P. thornei (18,48,54).…”

mentioning

confidence: 97%

Selected Pacific Northwest Crops as Hosts of Pratylenchus neglectus and P. thornei

Smiley

Yan²,

Gourlie

2014

Plant Disease

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Smiley, R. W., Yan, G. P., and Gourlie, J. A. 2014. Selected Pacific Northwest crops as hosts of Pratylenchus neglectus and P. thornei. Plant Dis. 98:1341-1348.Thirty crop species and cultivars were assayed in the greenhouse for efficiency as hosts of Pratylenchus neglectus and P. thornei. Hosting ability ratings were assigned using the ratio of final versus initial nematode density and also by comparing the final nematode density to that of a susceptible wheat control. Good hosts of both Pratylenchus spp. included oat 'Monida', chickpea 'Myles', and lentil 'Athena' and 'Morton'. Good hosts of P. neglectus but not of P. thornei included 10 Brassica spp. (5 canola, 2 mustard, and 3 camelina cultivars), chickpea

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The distribution, pathogenicity and ecology ofPratylenchus Thornei in the northern negev

Cited by 11 publications

References 2 publications

Diploid and tetraploid progenitors of wheat are valuable sources of resistance to the root lesion nematode Pratylenchus thornei

Diploid and tetraploid progenitors of wheat are valuable sources of resistance to the root lesion nematode Pratylenchus thornei

Selected Pacific Northwest Rangeland and Weed Plants as Hosts of Pratylenchus neglectus and P. thornei

Selected Pacific Northwest Crops as Hosts of Pratylenchus neglectus and P. thornei

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