Please use this identifier to cite or link to this item: https://hdl.handle.net/1959.11/55120
Title: Aggressiveness of Phytophthora medicaginis on chickpea: Phenotyping method determines isolate ranking and host genotype-by-isolate interactions
Contributor(s): Bithell, Sean L (author); Backhouse, David  (author)orcid ; Harden, Steve (author); Drenth, André (author); Moore, Kevin (author); Flavel, Richard J  (author)orcid ; Hobson, Kristy (author)
Publication Date: 2022-06
Early Online Version: 2022-04-29
Open Access: Yes
DOI: 10.1111/ppa.13547
Handle Link: https://hdl.handle.net/1959.11/55120
Abstract: 

Phytophthora medicaginis causing Phytophthora root rot of chickpea (Cicer arietinum) is an important disease, with genetic resistance using C. arietinum × Cicer echinospermum crosses as the main disease management strategy. We evaluated pathogenic variation in P. medicaginis populations with the aim of improving phenotyping methods for disease resistance. We addressed the question of individual isolate aggressiveness across four different seedling-based phenotyping methods conducted in glasshouses and one field-based phenotyping method. Our results revealed that a seedling media surface inoculation method used on a susceptible C. arietinum variety and a moderately resistant C. arietinum × C. echinospermum backcross detected the greatest variability in aggressiveness among 37 P. medicaginis isolates. Evaluations of different components of resistance, using our different phenotyping methods, revealed that differential pathogen–isolate reactions occur with some phenotyping methods. We found support for our hypotheses that the level of aggressiveness of P. medicaginis isolates depends on the phenotyping method, and that phenotyping methods interact with both isolate and host genotype reactions. Our cup-based root inoculation method showed promise as a non-field-based phenotyping method, as it provided significant correlations with genotype–isolate rankings in the field experiment for a number of disease parameters.

Publication Type: Journal Article
Source of Publication: Plant Pathology, 71(5), p. 1076-1091
Publisher: Wiley-Blackwell Publishing Ltd
ISSN: 1365-3059
0032-0862
Fields of Research (FoR) 2020: 300299 Agriculture, land and farm management not elsewhere classified
300409 Crop and pasture protection (incl. pests, diseases and weeds)
310805 Plant pathology
Socio-Economic Objective (SEO) 2020: 260303 Grain legumes
Peer Reviewed: Yes
HERDC Category Description: C1 Refereed Article in a Scholarly Journal
Appears in Collections:Journal Article
School of Environmental and Rural Science

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