Indian Society of Genetics & Plant Breeding

Postulation of resistance genes and assessment of adult plant response variation for stripe rust in three international wheat nurseries

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Stripe rust, caused by Puccinia striiformis f. sp. tritici (Pst),
is an important disease of wheat in cooler and humid
geographic regions. It can cause significant yield losses.
Three international nurseries, namely, 1st Australian Special
Nursery (ASN), 22nd Semi-Arid Wheat Screening Nursery
(SAWSN) and 12th High Temperature Wheat Yield Trial
(HTWYT), were evaluated for seedling and adult plant
response variation for stripe rust. A low proportion of
these nurseries displayed stripe rust resistance in the
seedling stage. Fifty one percent of 1stASN, 54% 22nd SAWSN
and 17% 12th HTWYT entries did not carry any seedling
resistance genes. High level of APR to stripe rust was
expressed in the field in all three nurseries. Stripe rust
resistance genes Yr6,Yr7,Yr9, Yr17 andYr27 were postulated
either singly or in combinations across the three nurseries.
Some entries carried these genes in combination with
uncharacterised resistance. Based on Lr34 and Sr2 linked
markers, Yr18 and Yr30 are inferred to be present in a high
proportion of entries in all three nurseries. Due to the lack
of robust marker, we were unable to postulate Yr29, this
gene is however expected to be present in Pavon 76
derivatives. Results of this study can be used for strategic
deployment of stripe rust resistance in new wheat cultivars.
 

Keywords: Adult plant resistance, gene postulation, stripe rust, wheat

Info

Year: 2014
Volume: 74
Issue: 1
Article DOI: N/A
Print ISSN: 0019-5200
Online ISSN: 0975-6906

Authors

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Urmil K. Bansal,Hanif Miah Muhammad, B. Gill and Harbans S. Bariana info_circle

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