Genetic structure of Cochliobolus sativus populations sampled from roots and leaves of barley and wheat in North Dakota

Article

Gyawali, Sanjaya, Neate, Stephen M., Adhikari, Tika B., Puri, Krishna D., Burlakoti, Rishi R. and Zhong, Shaobin. 2012. "Genetic structure of Cochliobolus sativus populations sampled from roots and leaves of barley and wheat in North Dakota." Journal of Phytopathology. 160 (11-12), pp. 637-646. https://doi.org/10.1111/j.1439-0434.2012.01956.x
Article Title

Genetic structure of Cochliobolus sativus populations sampled from roots and leaves of barley and wheat in North Dakota

ERA Journal ID2608
Article CategoryArticle
AuthorsGyawali, Sanjaya (Author), Neate, Stephen M. (Author), Adhikari, Tika B. (Author), Puri, Krishna D. (Author), Burlakoti, Rishi R. (Author) and Zhong, Shaobin (Author)
Journal TitleJournal of Phytopathology
Journal Citation160 (11-12), pp. 637-646
Number of Pages10
Year2012
Place of PublicationBerlin, Germany
ISSN0931-1785
1439-0434
Digital Object Identifier (DOI)https://doi.org/10.1111/j.1439-0434.2012.01956.x
Web Address (URL)http://onlinelibrary.wiley.com/doi/10.1111/j.1439-0434.2012.01956.x/pdf
Abstract

Common root rot (CRR) and spot blotch, caused by Cochliobolus sativus (Ito and Kurib.) Drechsl. ex Dast., are important diseases of barley (Hordeum vulgare L.) and wheat (Triticum aestivum L.) worldwide. However, the population biology of C. sativus is still poorly understood. In this study, the genetic structure of three C. sativus populations, consisting of isolates sampled respectively from barley leaves (BL), barley roots (BR)and wheat roots (WR) in North Dakota, was analysed with amplified fragment length polymorphism (AFLP) markers. A total of 127 AFLP loci were generated among 208 C. sativus isolates analysed with three primer combinations.Gene diversity (H = 0.277–0.335) were high in all three populations. Genetic variation among C. sativus individuals within population accounted for 74%, whereas 26% of the genetic variation was explained among populations. Genetic differentiation was high (ØPT = 0.261, corrected G'st= 0.39), whereas gene flow (Nm) ranged from 1.27 to 1.56 among the three populations analysed. The multilocus linkage disequilibrium (LD) (rd= 0.076–0.117) was moderate in C sativus populations. Cluster analyses indicate that C. sativus populations differentiated according to the hosts (barley and wheat) and tissues (root and leaf) although generalists also exist in North Dakota. Crop breeding may benefit from combining genes for resistance against both specialists and generalists of C. sativus.

KeywordsCochliobolus sativus; amplified fragment length polymorphism; genetic differentiation; common root rot; spot blotch; barley; wheat
ANZSRC Field of Research 2020310509. Genomics
310805. Plant pathology
300404. Crop and pasture biochemistry and physiology
Public Notes

© 2012 Blackwell Verlag GmbH. Published version deposited in accordance with the copyright policy of the publisher.

Byline AffiliationsNorth Dakota State University, United States
Institution of OriginUniversity of Southern Queensland
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