Insights into the mechanism of Huanglongbing tolerance in the Australian finger lime (Citrus australasica)

Kyle C Weber; Lamiaa M Mahmoud; Daniel Stanton; Stacy Welker; Wenming Qiu; Jude W Grosser; Amit Levy; Manjul Dutt

doi:10.3389/fpls.2022.1019295

Insights into the mechanism of Huanglongbing tolerance in the Australian finger lime (Citrus australasica)

Front Plant Sci. 2022 Oct 21:13:1019295. doi: 10.3389/fpls.2022.1019295. eCollection 2022.

Authors

Kyle C Weber¹, Lamiaa M Mahmoud^{1

2}, Daniel Stanton¹, Stacy Welker¹, Wenming Qiu³, Jude W Grosser¹, Amit Levy¹, Manjul Dutt¹

Affiliations

¹ Citrus Research and Education Center, University of Florida, Lake Alfred, FL, United States.
² Pomology Department, Faculty of Agriculture, Mansoura University, Mansoura, Egypt.
³ Institute of Fruit and Tea, Hubei Academy of Agricultural Sciences, Wuhan, China.

Abstract

The Australian finger lime (Citrus australasica) is tolerant to Huanglongbing (HLB; Citrus greening). This species can be utilized to develop HLB tolerant citrus cultivars through conventional breeding and biotechnological approaches. In this report, we conducted a comprehensive analysis of transcriptomic data following a non-choice infection assay to understand the CaLas tolerance mechanisms in the finger lime. After filtering 3,768 differentially expressed genes (DEGs), 2,396 were downregulated and 1,372 were upregulated in CaLas-infected finger lime compared to CaLas-infected HLB-susceptible 'Valencia' sweet orange. Comparative analyses revealed several DEGs belonging to cell wall, β-glucanase, proteolysis, R genes, signaling, redox state, peroxidases, glutathione-S-transferase, secondary metabolites, and pathogenesis-related (PR) proteins categories. Our results indicate that the finger lime has evolved specific redox control systems to mitigate the reactive oxygen species and modulate the plant defense response. We also identified candidate genes responsible for the production of Cys-rich secretory proteins and Pathogenesis-related 1 (PR1-like) proteins that are highly upregulated in infected finger lime relative to noninfected and infected 'Valencia' sweet orange. Additionally, the anatomical analysis of phloem and stem tissues in finger lime and 'Valencia' suggested better regeneration of phloem tissues in finger lime in response to HLB infection. Analysis of callose formation following infection revealed a significant difference in the production of callose plugs between the stem phloem of CaLas+ 'Valencia' sweet orange and finger lime. Understanding the mechanism of resistance will help the scientific community design strategies to protect trees from CaLas infection and assist citrus breeders in developing durable HLB tolerant citrus varieties.

Keywords: Huanglongbing; callose deposition; citrus; host response; pathogen-related proteins; transcriptome.