Huanglongbing (HLB), considered the
most serious citrus disease in the world, is associated with the nonculturable bacteriu
m 鈥?i>Candidatus Liberibacter asiaticus鈥?(Las). Infection of citrus by this pathogen leads to reduced plant vigor and productivity, ulti
mately resulting in death of the infected tree. It can take up to two years following initial infection before outward sy
mpto
ms beco
me apparent,
making detection difficult. The existing knowledge gap in our understanding of Las and its pathogenesis leading to HLB has sty
mied develop
ment of treat
ments and
methods to
mitigate the pathogen鈥檚 influence. To evaluate the influence of Las on fruit quality in both sy
mpto
matic and asy
mpto
matic fruit, and gain further insight into the pathogenesis of the disease, a
1H NMR
metabolo
mics investigation, co
mple
mented with physicoche
mical and analyte-specific analyses, was undertaken. Co
mparison of the juice obtained fro
m oranges gathered fro
m Las
+ (sy
mpto
matic and asy
mpto
matic) and Las
鈥?/sup> (healthy) trees revealed significant differences in the concentrations of sugars, amino and organic acids, limonin glucoside, and limonin. This study demonstrates differing metabolic profiles in the juice of oranges from Las+ and Las鈥?/sup> and proposes how Las may be able to evade citrus defense responses.
Keywords:
citrus; Citrus sinensis; Huanglongbing; metabolomics&qsSearchArea=searchText">metabolomics; NMR; Valencia oranges