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Temperature and Isolate Are Important Determinants of Brassica napus Susceptibility to Aggressive Sclerotinia sclerotiorum Isolates

Authors :
Bennett, Pippa J. Michael
Ashmita Rijal Lamichhane
Sarita Jane
Source :
Agronomy; Volume 13; Issue 6; Pages: 1606
Publication Year :
2023
Publisher :
Multidisciplinary Digital Publishing Institute, 2023.

Abstract

Management of Sclerotinia stem rot (SSR) disease in Brassica napus is heavily reliant on prophylactic fungicide applications at flowering, which often provides inconsistent control depending on timing of ascospore release in the field and environmental conditions. Understanding host response to Sclerotinia sclerotiorum infection is essential for sustainable disease management in the future. This study determined host response of nine B. napus varieties to four aggressive S. sclerotiorum isolates across two years by measuring four disease variables: area under the disease progress stairs (AUDPS), seed production, sclerotia number and average sclerotia weight. Brassica napus varieties varied greatly in their response to the four measured variables, with varieties producing the highest AUDPS not being the same varieties that had the lowest seed production, the highest numbers of sclerotia or heaviest sclerotia. Repeating the experiment over two years using the same varieties and isolates identified the impact of environment on measured disease variables as the most influential factor, highlighting the complexity of disease responses to diverse isolates and host genotypes under different environments. It was recommended that both long-term (such as inoculum production) and short-term (such as seed production) disease outcomes be combined with lesion length measurement (i.e., AUDPS) for future host screening studies.

Details

Language :
English
ISSN :
20734395
Database :
OpenAIRE
Journal :
Agronomy; Volume 13; Issue 6; Pages: 1606
Accession number :
edsair.multidiscipl..73aef5c141ae726a35c84edb13b2edf4
Full Text :
https://doi.org/10.3390/agronomy13061606