Resistance of wheat, barley and oat to Heterodera avenae in the Pacific Northwest, USA
Abstract The cereal cyst nematode, Heterodera avenae, occurs in at least seven western states of the USA and reduces grain yield in localised regions and in selected crop management systems. Virulence phenotypes for H. avenae populations in North America have not been reported. Nine individual assay...
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Published in | Nematology : international journal of fundamental and applied nematological research Vol. 13; no. 5; pp. 539 - 552 |
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Main Authors | , , |
Format | Journal Article |
Language | English |
Published |
The Netherlands
Brill
2011
BRILL |
Subjects | |
Online Access | Get full text |
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Summary: | Abstract
The cereal cyst nematode, Heterodera avenae, occurs in at
least seven western states of the USA and reduces grain yield in localised
regions and in selected crop management systems. Virulence phenotypes for
H. avenae populations in North America have not been
reported. Nine individual assays in six experiments were conducted to
determine the reactions of barley, oat and wheat cultivars to five
H. avenae populations in the Pacific Northwest (PNW)
states of Idaho, Oregon and Washington. Three populations were evaluated for
virulence to 23 entries of the 'International Test Assortment for
Defining Cereal Cyst Nematode Pathotypes', plus selected local
cultivars and entries representing a greater diversity of resistance genes.
The virulence phenotype(s) for populations of H. avenae in
the PNW did not correspond to any of the 11 pathotypes defined by the Test
Assortment. Five PNW populations exhibited affinities with Group 2 but were
not defined by pathotypes Ha12 and Ha22. Reproduction was prevented or
greatly inhibited by barley carrying the Rha3 resistance
gene and by most carriers of Rha2 resistance, and by
selected oat cultivars with multigenic resistance. Wheat cultivars carrying
the Cre1 resistance gene were highly effective in
suppressing H. avenae reproduction. Current PNW wheat
cultivars do not carry the Cre1 resistance gene. Crosses
between Ouyen, an Australian bread wheat with Cre1
resistance, and several PNW wheat cultivars were resistant. The
CreR gene also prevented H. avenae
reproduction in the trial where it was tested. Intermediate levels of
reproduction occurred on wheat cultivars carrying the Cre5,
Cre7 and Cre8 resistance genes, each
of which was considered useful for pyramiding into cultivars with
Cre1 resistance. This research identified genetic
resources of value in PNW cereal crop breeding programmes. |
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Bibliography: | href:15685411_013_05_s004_text.pdf ark:/67375/JKT-78KG9MSW-B istex:8725F0166931430DDBF7604E582E3D5711235639 |
ISSN: | 1388-5545 1568-5411 1388-5545 |
DOI: | 10.1163/138855410X531862 |