Resistance to greenbug (Heteroptera: Aphididae) biotype I in Aegilops tauschii synthetic wheats

The greenbug, Schizaphis graminum (Rondani), is a major pest of wheat in North America, reducing U.S. wheat production by $60 to $100 million each year. In this research, 149 wheat lines containing genes from Aegilops tauschii (Coss.) Schmal. were evaluated for resistance to greenbug biotype I. More...

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Bibliographic Details
Published in:Journal of economic entomology 2003-10, Vol.96 (5), p.1571-1576
Main Authors: Smith, C.M, Starkey, S
Format: Article
Language:English
Subjects:
Aegilops tauschii
antibiosis
Aphididae
Biological and medical sciences
biotypes
body weight
breeding lines
Control
dry matter accumulation
Egilops tauschii
Fundamental and applied biological sciences. Psychology
Generalities
germplasm evaluation
Heteroptera - physiology
insect pests
Pest Control, Biological
pest tolerance
Phytopathology. Animal pests. Plant and forest protection
Plant Diseases - genetics
Plants, Genetically Modified
Poaceae - genetics
population size
Protozoa. Invertebrates
resistance mechanisms
Schizaphis graminum
synthetic populations
Triticum - genetics
Triticum aestivum
wheat
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Summary:The greenbug, Schizaphis graminum (Rondani), is a major pest of wheat in North America, reducing U.S. wheat production by $60 to $100 million each year. In this research, 149 wheat lines containing genes from Aegilops tauschii (Coss.) Schmal. were evaluated for resistance to greenbug biotype I. More than 50% of the lines sustained moderate foliar chlorosis from greenbug feeding, and approximately one third of all the lines were highly resistant. All lines with chlorosis scores similar to the resistant control 'Largo' expressed high levels of antibiosis, producing greenbug populations with mean weights ranging from 0.05 to 11.8 mg. There was no significant difference between greenbug weights on these lines and those reared on 'Largo', but the mean weight of individuals reared on the susceptible control 'Thunderbird' was significantly greater than those reared on 'Largo' or any of the test lines. The mean population size of greenbugs produced on plants of each line was significantly correlated with mean greenbug weight. Tolerance was not evident in any of the lines examined, but was unexpectedly apparent in 'Thunderbird' at a level similar to that in the tolerant control cultivar 'Largo'.
ISSN:0022-0493
1938-291X
DOI:10.1043/0022-0493(2003)096(1571:RTGHAB)2.0.CO;2