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Mechanism of leaf rust resistance in wheat wild relatives, Triticum monococcum L. and T. boeoticum L.

Published online by Cambridge University Press:  08 June 2021

Amandeep K. Riar Open the ORCID record for Amandeep K. Riar [Opens in a new window] ,
Parveen Chhuneja Open the ORCID record for Parveen Chhuneja [Opens in a new window] ,
Beat Keller  and
Kuldeep Singh
Amandeep K. Riar*
Affiliation:
Department of Plant Breeding and Genetics, Punjab Agricultural University, Ludhiana, Punjab, India
Parveen Chhuneja
Affiliation:
School of Agricultural Biotechnology, Punjab Agricultural University, Ludhiana141004, India
Beat Keller
Affiliation:
Institute of Plant Biology, University of Zurich, Zurich, Switzerland
Kuldeep Singh
Affiliation:
National Bureau of Plant Genetic Resources, Pusa campus, New Delhi110012, India
*
*Corresponding author. E-mail: [email protected]
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Abstract

Triticum monococcum L. and T. boeoticum L., diploid wild relatives of bread wheat (T. aestivum L.), possess resistance to leaf rust (also known as brown rust) caused by Puccinia triticina Eriks. Haustorium formation-based resistance mechanisms (i.e. pre-haustorial and post-haustorial resistance) to leaf rust have been studied and reported in various T. monococcum accessions. In the present study, the mechanism of leaf rust resistance in T. monococcum and T. boeoticum accessions was studied using confocal laser scanning microscopy. Components of resistance studied at a histological level against leaf rust pathotypes, a Mexican pathotype (TCB/TD) and a Swiss pathotype (97512-19), indicated different types of resistance mechanism operative in the two accessions. The resistance in T. monococcum ranged from pre-haustorial resistance against 97512-19 to post-haustorial resistance against TCB/TD. The response in T. boeoticum was post-haustorial with necrosis against the two pathotypes. Pre-haustorial resistance observed in T. monococcum could serve as a potential source of durable rust resistance in wheat breeding.

Keywords

leaf rustpost-haustorial resistancepre-haustorial resistanceT. aestivum Puccinia triticinaT. boeoticumT. monococcumwheat wild relatives
Type
Research Article
Information
Plant Genetic Resources , Volume 19 , Issue 4 , August 2021 , pp. 320 - 327
Copyright
Copyright © The Author(s), 2021. Published by Cambridge University Press on behalf of NIAB

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