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ARS Home » Pacific West Area » Parlier, California » San Joaquin Valley Agricultural Sciences Center » Crop Diseases, Pests and Genetics Research » Research » Publications at this Location » Publication #387520

Research Project: Characterization and Management of Citrus Pathogens Transmitted by Phloem-Feeding Insect Vectors

Location: Crop Diseases, Pests and Genetics Research

Title: Host metabolomic responses to CTV infection

item Wallis, Christopher
item RATTNER, RACHEL - Cooperative Agricultural Support Services
item GORMAN, ZACHARY - Texas A&M University
item HAJERI, SUBHAS - Central California Tristeza Eradication Agency
item Yokomi, Raymond - Ray

Submitted to: Meeting Abstract
Publication Type: Abstract Only
Publication Acceptance Date: 9/13/2021
Publication Date: 10/6/2021
Citation: Wallis, C.M., Rattner, R., Gorman, Z., Hajeri, S., Yokomi, R.K. 2021. Host metabolomic responses to CTV infection. Meeting Abstract. Proceedings of the 2021 Citrus Research Conference.

Interpretive Summary:

Technical Abstract: Citrus tristeza virus (CTV) is the most serious viral disease of citrus. However, disease severity depends on the CTV strain and cultivar/rootstock. To examine how CTV affects citrus, mild (RB, S1, T36), severe (VT), and MCA13-negative (T30) strains were inoculated and evaluated in six cultivars (Navel, Valencia, Murcott, Minneola, Oroblanco, and Lemon) on Carrizo and grown in a screenhouse for four years. CTV titer was highest in trees infected with VT strains, but did not significantly differ among cultivars. Stem pitting was greatest in Oroblanco but also occurred in sweet orange and Minneola. Regarding metabolic (amino acids, sugars, phenolics, terpenoids) differences, more variability was due to the cultivar than CTV infection status. Severe CTV increased total amino acid levels overall than mild or T30 strains and were greatest in Murcott trees. CTV effects on sugar levels were dependent on individual cultivars. Total phenolic levels were reduced in trees infected with mild or MCA13-negative strains, but not when infected with severe CTV strains. Oroblanco had greater phenolic levels than the other tested trees. Terpenoid levels varied greatly among cultivars, with the greatest levels reached in lemon, but were not affected by CTV infections. Overall, these results reveal biochemical profiles that could not only distinguish citrus cultivar, but also might hint at infection status. This research was supported by CRB 5300-185.