All roads lead to Rome: Towards understanding different avenues of tolerance to huanglongbing in citrus cultivars

Plant Physiology and Biochemistry : PPB
Nabil KillinyJude W Grosser

Abstract

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 aci...Continue Reading

Citations

Oct 16, 2019·Frontiers in Plant Science·Avi SadkaEduardo Blumwald
Mar 20, 2020·International Journal of Molecular Sciences·Wenming QiuManjul Dutt
May 27, 2021·Plant Science : an International Journal of Experimental Plant Biology·Nabil KillinyStephen L Lapointe
Jul 31, 2021·Critical Reviews in Biotechnology·Shahzad MunirYueqiu He
Aug 24, 2021·Frontiers in Plant Science·Joon Hyuk SuhYu Wang

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