| Autor: |
Collins, Meghan B., Haley, Scott D., Peairs, Frank B., Rudolph, Jeffrey B. |
| Předmět: |
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| Zdroj: |
Crop Science; Sep/Oct2005, Vol. 45 Issue 5, p1877-1880, 4p |
| Abstrakt: |
The Russian wheat aphid [Diuraphis noxia (Mordvilko), RWA] is an important pest of wheat (Triticum aestivum L.) in the western Great Plains region of the United States. The recent identification of a RWA biotype (provisionally denoted as Biotype 2) that is virulent on currently deployed RWA-resistant cultivars necessitates the rapid identification of resistance to the new biotype. The objective of this study was to identify Biotype 2 RWA resistance among a collection of germplasm accessions previously determined to be resistant to the original North American biotype of RWA (provisionally denoted as Biotype 1). A collection of 761 germplasm accessions was evaluated in standard seedling screening tests with Biotype 2 RWA. `TAM 107' (carries no RWA resistance genes) and `Halt' (Dn4 resistance gene) were used as susceptible checks while the germplasm line 94M370 (Dn7 resistance gene) was used as a resistant check. Evaluation of accessions showing at least a moderate level of resistance in unreplicated tests was repeated with three replications in a randomized complete block design. Forty-four germ plasm accessions were identified as having high to moderate levels of resistance to Biotype 2 RWA. Most of these accessions originated from areas of the world where RWA is endemic or were derived from germplasm accessions that originated from these areas. Ten accessions showed a level of resistance comparable with the 94M370 check. These accessions should prove useful in future genetic studies and for breeding for resistance to Biotype 2 RWA. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
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