Agriculture Reference
In-Depth Information
sites with adequate uniformity of infestation and
absence of signifi cant impacts by other parasitic
nematode species and soilborne fungal patho-
gens. Additional wheat production effi ciency
and profi tability will be attained by improving
the level of nematode resistance and tolerance
in wheat cultivars produced on highly infested
fi elds.
Development of additional and improved
molecular markers will allow more rapid integra-
tion of resistance into commercial cultivars.
Genetic transformations may also aid in the devel-
opment of nematode-resistant germplasm. For
cyst nematodes, molecular techniques will also
facilitate greater precision in studies of resistance
mechanisms (Seah et al., 2000; Andrés et al.,
2001a; Montes et al., 2003, 2004).
Global complementation among regional or
national research programs has proven to be
highly benefi cial for identifying and deploying
germplasm with higher levels of resistance and
tolerance to cereal cyst and root-lesion nema-
todes. However, these global efforts currently
lack effective funding and coordination, limiting
the ability to realize the benefi ts already known to
exist. Greater collaboration is therefore needed
between advanced research institutions, interna-
tional organizations such as CIMMYT and
ICARDA, and scientists in countries where these
nematodes are known to be a problem. These
collaborative efforts will provide greater under-
standing of the complexity, economic importance,
and control of
Heterodera
and
Pratylenchus
popu-
lations, and of pathotype evolution or selection
for
Heterodera
species.
Heterodera avenae
, in Saudi Arabia. Nematology
3:379-382.
Andersen, S., and K. Andersen. 1982. Suggestions for deter-
mination and terminology of pathotypes and genes for
resistance in cyst-forming nematodes, especially
Heterodera
avenae
. EPPO Bull
.
12:379-386.
Andrés, M., T. Melillo, A. Delibes, M.D. Romero, and T.
Bleve-Zacheo. 2001a. Changes in wheat root enzymes cor-
related with resistance to cereal cyst nematodes. New
Phytol. 152:343-354.
Andrés, M.F., J. Pinochet, A. Hernández-Dorrego, and A.
Delibes. 2000. Detection and analysis of inter- and intra-
specifi c diversity of
Pratylenchus
spp. using isozyme
markers. Plant Pathol. 49:640-649.
Andrés, M.F., M.D. Romero, M.J. Montes, and A. Delibes.
2001b. Genetic relationships and isozyme variability in the
Heterodera avenae
complex determined by isoelectric
focusing. Plant Pathol. 50:270-279.
Armstrong, J.S., F.B. Peairs, S.D. Pilcher, and C.C. Russell.
1993. The effect of planting time, insecticides, and liquid
fertilizer on the Russian wheat aphid (Homoptera: Aphidi-
dae) and the lesion nematode (
Pratylenchus thornei
) on
winter wheat. J. Kans. Entomol. Soc. 66:69-73.
Barker, K.R., G.A. Pederson, and G.L. Windham (ed.)
1998. Plant and nematode interactions. ASA, Madison,
WI.
Barloy, D., J. Lemoine, P. Abelard, A.M. Tanguy, R. Rivoal,
and J. Jahier. 2007. Marker-assisted pyramiding of two
cereal cyst nematode resistance genes from
Aegilops varia-
bilis
in wheat. Mol. Breed. 20:31-40.
Barr, A.R., K.J. Chalmers, A. Karakousis, J.M. Kretschmer,
S. Manning, R.C.M. Lance, J. Lewis, S.P. Jefferies, and
P. Langridge. 1998. RFLP mapping of a new cereal cyst
nematode resistance locus in barley. Plant Breed.
117:185-187.
Bekal, S., J.P. Gauthier, and R. Rivoal. 1997. Genetic diver-
sity among a complex of cereal cyst nematodes inferred
from RFLP analysis of the ribosomal internal transcribed
spacer region. Genome 40:479-486.
Bernard, E.C., and M.E. Montgomery-Dee. 1993. Repro-
duction of plant parasitic nematodes on winter rapeseed
(
Brassica napus
spp.
oleifera
). J. Nematol. 25(4S):863-
868.
Bockus, W.W., R.L. Bowden, R.M. Hunger, W.L. Morrill,
T.D. Murray, and R.W. Smiley (ed.) 2009. Compendium
of wheat diseases and insects. 3rd ed. APS Press, St. Paul,
MN.
Bonfi l, D.J., B. Dolgin, I. Mufradi, and S. Asido. 2004. Bio-
assay to forecast cereal cyst nematode damage to wheat in
fi elds. Precision Agric. 5:329-344.
Brown, R.H. 1987. Control strategies in low-value crops. p.
351-387.
In
R.H. Brown and B.R. Kerry (ed.) Principals
and practice of nematode control in crops. Academic Press,
Sydney, Australia.
Carrasco-Ballesteros, S., P. Castillo, B.J. Adams, and E.
Pérez-Artés. 2007. Identifi cation of
Pratylenchus thornei
,
the cereal and legume root-lesion nematode, based on
SCAR-PCR and satellite DNA. Eur. J. Plant Pathol.
118:115-125.
REFERENCES
Abidou, H., A. El-Ahmed, J.M. Nicol, N. Bolat, R. Rivoal,
and A. Yahyaoui. 2005. Occurrence and distribution of
species of the
Heterodera avenae
group in Syria and Turkey.
Nematol. Mediterr. 33:195-201.
Al-Banna, L., A.T. Ploeg, V.M. Williamson, and I. Kaloshian.
2004. Discrimination of six
Pratylenchus
species using
PCR and species-specifi c primers. J. Nematol. 36:142-
146.
Al-Hazmi, A.S., R. Cook, and A.A.M. Ibrahim. 2001.
Pathotype characterisation of the cereal cyst nematode,
