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Novel sources of resistance to stripe rust in ICARDA barley germplasm

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Title Novel sources of resistance to stripe rust in ICARDA barley germplasm
 
Creator Verma, Ramesh Pal Singh
 
Contributor Selvakumar, Rajan
Shekhawat, P.S.
Gangwar, Prakash
Bhardwaj, Subhash Chand
Rehman, Sajid
Gyawali, Sanjaya
 
Subject gwas
stripe rust
Barley
 
Description Stripe rust of barley (Puccinia striiformis Westend. f. sp. Hordei) occurs worldwide and host resistance is
the most economically and environmentally appropriate option as the use of fungicides is not very common
in low input crops like barley. Breakdown of host resistance by new emerging pathotypes necessitates the
identification of new sources of resistance and the understanding of genetic mechanisms or diversity for
developing and deploying resistant barley cultivars. A total of 336 diverse barley genotypes consisting of
released cultivars, advanced lines, differentials and local landraces from ICARDA, were screened for
seedling and adult plant resistance (APR) to stripe rust in India. Seedling resistance test was done against
each of the five prevalent races {Q (5S0), 24 (0S0-1), 57 (0S0), M (1S0), and G (4S0)} at ICAR-IIWBR,
Shimla. The field evaluation for resistance was done at ARS, Durgapura (Rajasthan) in three years (2013 to
2015), and at IIW&BR Karnal (Haryana) in 2014 under artificial epiphytotics using the mixture of these
five races. Twelve barley genotypes (ARAMIR/COSSACK, Astrix, C8806, C9430, CLE 202, Gold, Gull,
Isaria, Lechtaler, Piroline, Stirling, and Trumpf) were resistant to all five races at seedling stage as well as
under field screening. Another 42 genotypes were found with slow rusting ability (< 1000 AUDPC values
from a range of 520-3600) under heavy inoculum load, restricting the final disease score up to 40MS/S,
while the susceptible ones scored up to 100S. It is indicated that resistant genotypes possess novel genes for
absolute as well as durable resistance, though more research is warranted for gene postulation in the
identified sources. The GWAS is in progress to identify genomic regions conferring resistance in these
genotypes.
 
Date 2017-02-08
2017-02-20T13:16:29Z
2017-02-20T13:16:29Z
 
Type Poster
 
Identifier https://mel.cgiar.org/reporting/download/hash/nFBFHNk5
Ramesh Pal Singh Verma, Rajan Selvakumar, P. S. Shekhawat, Prakash Gangwar, Subhash Chand Bhardwaj, Sajid Rehman, Sanjaya Gyawali. (8/2/2017). Novel sources of resistance to stripe rust in ICARDA barley germplasm. Jordan: International Center for Agricultural Research in the Dry Areas (ICARDA).
https://hdl.handle.net/20.500.11766/5814
Open access
 
Language en
 
Rights CC-BY-4.0
 
Format PDF
 
Publisher International Center for Agricultural Research in the Dry Areas (ICARDA)