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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
agricultural and biological sciences
All roads lead to Rome: Towards understanding different avenues of tolerance to huanglongbing in citrus cultivars
Plant Physiology and Biochemistry, Volume 129, Year 2018
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Description
Citrus tolerance to huanglongbing could result from tolerance to the pathogen Candidatus Liberibacter asiaticus (CLas) and/or to its vector Diaphorina citri. Field observations and greenhouse-controlled studies showed that some citrus cultivars were more tolerant than others. However, the mechanism(s) behind the tolerance has not been determined yet. Using GC-MS, we investigated the volatile organic compounds (VOCs) and the non-volatile metabolite profiles of two tolerant citrus cultivars- Australian finger lime, ‘LB8-9’ Sugar Belle® mandarin hybrid, and a recently released mandarin hybrid ‘Bingo’. The three were grafted onto the rootstock, Carrizo citrange. Our findings showed that the metabolomic profiles of Australian finger lime were different from that of ‘LB8-9’. Finger lime was high in many amino acids and tricarboxylic acid intermediates, whereas ‘LB8-9’ was high in several amino acids, sugars, and sugar alcohols. ‘LB8-9’ was high in thymol, which is known for its strong antimicrobial activity against a panel of pathogenic bacteria. The metabolomic profiles of ‘Bingo’ were intensely different from the other mandarin hybrid, ‘LB8-9’ including a reduced thymol biosynthetic pathway and low amounts of most of the amino acids and sugar alcohols. Remarkably, 1,8-cineole (eucalyptol) was only detected in ‘Bingo’ indicating that eucalyptol could have feeding and ovipositional repellency against D. citri. The metabolite profiles generated for HLB-tolerant citrus species will improve the ability of citrus breeders and will allow them to take more informed decisions. Metabolomic profiling of HLB-tolerant citrus species could identify tolerance specific markers that can be introduced to other commercial citrus cultivars to improve their tolerance to HLB disease. © 2018 Elsevier Masson SAS
Authors & Co-Authors
Killiny, Nabil
United States, Gainesville
University of Florida
Jones, Shelley E.
United States, Gainesville
University of Florida
Nehela, Yasser
United States, Gainesville
University of Florida
Hijaz, Faraj
United States, Gainesville
University of Florida
Dutt, Manjul
United States, Gainesville
University of Florida
Gmitter, Frederick G.
United States, Gainesville
University of Florida
Grosser, Jude W.
United States, Gainesville
University of Florida
Statistics
Citations: 36
Authors: 7
Affiliations: 1
Identifiers
Doi:
10.1016/j.plaphy.2018.05.005
ISSN:
09819428