62
Views
14
CrossRef citations to date
0
Altmetric
GENETICS AND RESISTANCE

Genetics of leaf rust resistance in the spring wheats ‘Ivan’ and ‘Knudson’ spring wheat

&
Pages 223-229 | Accepted 01 May 2006, Published online: 01 Apr 2010
 

Abstract

Leaf rust caused by Puccinia triticina is a common and widespread disease of wheat in North America and worldwide. Durable genetic resistance to leaf rust in wheat has been difficult to achieve, since the virulence of the leaf rust pathogen to specific leaf rust resistance genes in wheat is highly variable. ‘Ivan’ and ‘Knudson’, hard red spring wheat cultivars recently released by AgriPro®, are highly resistant to leaf rust. The objective of this study was to determine the identity of leaf rust resistance genes present in both cultivars. ‘Ivan’ and ‘Knudson’ were crossed with ‘Thatcher’, a cultivar susceptible to leaf rust; the F1 plants were backcrossed to ‘Thatcher’; and the BCF1 plants (approximately 80 from each cross) were selfed to develop BCF2 families. The BCF2 families were tested as seedlings with different P. triticina isolates to determine the number and identity of leaf rust resistance genes that segregated in the BCF2 families. Both the BCF3 lines from selected resistant BCF2 plants and near-isogenic lines of ‘Thatcher’ were tested with different P. triticina isolates to confirm the identity of the resistance genes. Selected BCF2 families were also tested as adult plants in the greenhouse and field to identify genes for adult plant leaf rust resistance. ‘Ivan’ was determined to have genes Lr16 and Lr24 and ‘Knudson’ to have Lr3, Lr10, Lr13, Lr16, Lr23, and Lr34. ‘Ivan’ has been highly resistant because of the rarity of leaf rust isolates with virulence to Lr16 and Lr24, while the combination of Lr16, Lr23, and Lr34 accounts for the resistance in ‘Knudson’.

Reprints and Corporate Permissions

Please note: Selecting permissions does not provide access to the full text of the article, please see our help page How do I view content?

To request a reprint or corporate permissions for this article, please click on the relevant link below:

Academic Permissions

Please note: Selecting permissions does not provide access to the full text of the article, please see our help page How do I view content?

Obtain permissions instantly via Rightslink by clicking on the button below:

If you are unable to obtain permissions via Rightslink, please complete and submit this Permissions form. For more information, please visit our Permissions help page.